Relevant bibliographies by topics / Colonoscopy

Academic literature on the topic 'Colonoscopy'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2024

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Journal articles on the topic "Colonoscopy"

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Veselov, V. V., A. M. Nechipai, E. A. Poltoryhina, and A. V. Vasilchenko. "FIRST EXPERIENCE IN FULL-SPECTRUM COLONOSCOPY." Koloproktologia, no. 2 (June 30, 2017): 36–46. http://dx.doi.org/10.33878/2073-7556-2017-0-2-36-46.

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Colonoscopy with a forward-viewing camera leaves regions that are not visualized in detail. Thus development of video-enoscopy systems with wide angle of view is needed. Full-spectrum colonoscopes providing image of Ultra HD 4K quality are now available in Russia. MATERIALS AND METHODS. Seventy patents were assessed with a full-spectrum colonoscope. In 51 (72,8°%) of them the procedure was performed also for physician's training purposes. Fifteen (21,4%) patients underwent simultaneous full-spectrum and forward-viewing colonoscopies, while in 4 (5,7%) full-spectrum endoscope was used to visualize lesions that were non-assessable with traditional equipment. RESULTS. Applying Jull-spectrum colonoscopy for diagnosis resulted in detecting 170 polyps in 51 patients (polyp detection rate was 47,1%). Simultaneous use of full-spectrum colonoscope after forward-viewing equipment led to 9 additional polyps detection in one patient and 23 additional polyps in another one. In 7 patents full-spectrum colonoscopy allowed detection of polyps that were not found via forward-viewing equipment. CONCLUSION. During full-spectrum colonoscopy inner colonic surface can be visualized with an angle of view of 330° which is twice more than video-capturing area ofa standard forward-viewing endoscope. The equipment allows to significantly increase adenoma detection rate.
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Hamada, Yasuhiko, Kyosuke Tanaka, Masaki Katsurahara, Noriyuki Horiki, Reiko Yamada, Junya Tsuboi, Misaki Nakamura, Satoshi Tamaru, Tomomi Yamada, and Yoshiyuki Takei. "Efficacy of a small-caliber colonoscope for pain in female patients during unsedated colonoscopy: a randomized controlled study." Endoscopy International Open 09, no. 07 (June 17, 2021): E1055—E1061. http://dx.doi.org/10.1055/a-1464-0780.

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Abstract Background and study aims Female sex has been identified as a factor increasing patients’ pain during colonoscopy. The aim of this randomized controlled study was to investigate the efficacy of a small-caliber colonoscope, PCF-PQ260 L, for limiting pain in women during unsedated colonoscopy. Patients and methods Women who underwent unsedated colonoscopy were randomly allocated to either the small-caliber or standard colonoscope group. The primary outcome was overall pain and secondary outcomes were maximum pain and procedural measures. In addition, the effects of colonoscope type were analysed using analysis of covariance and logistic regression with adjustment for stratification factors, age and prior abdomino-pelvic surgery. Results A total of 220 women were randomly assigned to the small-caliber (n = 110) or standard (n = 110) colonoscope groups. Overall and maximum pain scores were significantly lower in the small-caliber colonoscope group than the standard colonoscope group (overall pain, 20.0 vs. 32.4, P < 0.0001; maximum pain, 28.9 vs. 47.2, P < 0.0001). The small-caliber colonoscope group achieved a superior cecal intubation rate (99 % vs. 93 %, P = 0.035). The rate of patient acceptance of unsedated colonoscopy in the future was higher in the small-caliber colonoscope group than in the standard colonoscope group (98 % vs. 87 %, P = 0.003). In addition, the small-caliber colonoscope was superior with respect to reducing pain and improving the rate of patient acceptance of unsedated colonoscopy with adjustment. Conclusions This study demonstrates the efficacy of the small-caliber colonoscope for reducing pain in women and improving their rate of acceptance of unsedated colonoscopy.
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CHENG, WU BIN, MICHAEL A. J. MOSER, SIVARUBAN KANAGARATNAM, and WEN JUN ZHANG. "PREDICATION FOR RELATIVE MOTION OF THE COLONOSCOPE IN COLONOSCOPY." Journal of Mechanics in Medicine and Biology 13, no. 03 (May 14, 2013): 1350023. http://dx.doi.org/10.1142/s0219519413500231.

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Colonoscopy is common procedure frequently carried out. It is not without its problems, which include looping formation. Looping formation prevents the tip of the colonoscope itself from advancing, thus further probing induces a risk of perforation, significant patient discomfort, and failure of colonoscopy. During colonoscopy, the manipulated colonoscope for intubation in the colon goes through the friction between the colonoscope and the colon. Due to major frictional force, the sigmoidal colon forms looping with the scope during intubation. The interactive frictional force between the colon and the colonoscope is highly complex because of frictional contact between two deformable objects. In this paper, contact force computation was formulated into a linear complementarity problem (LCP) by linearizing Signorini's problem, which was adapted into non-interpenetration with unilateral constraints. Frictional force was computed by the mechanical compliance of finite element method (FEM) models with the consideration of dynamic friction between the colonoscope and the intestinal wall. Furthermore, we presented a mathematical model of the elongation of the colon that predicts the motion of scope relative to the intestinal wall in colonoscopy.
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Holubar, Stefan, Amit Dwivedi, J. Eisendorfer, R. Levine, and R. Strauss. "Splenic Rupture: An Unusual Complication of Colonoscopy." American Surgeon 73, no. 4 (April 2007): 393–96. http://dx.doi.org/10.1177/000313480707300417.

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Splenic injury is a known, albeit rare, complication of diagnostic and therapeutic colonoscopy. Within a 6-month period, we observed two colonoscopic splenic injuries. We report these two cases of splenic injury who presented differently after colonoscopy: one presented as frank hemorrhagic shock, and the other as a subacute splenic hemorrhage with symptomatic anemia. The first patient presented with hemorrhagic shock several hours after a diagnostic colonoscopy and required an emergency splenectomy. The second patient presented with symptomatic anemia several days after a diagnostic colonoscopy and was treated by angiographic embolization. Clinical presentation and discussion of the mechanisms of injury, available treatment options, and strategies for preventing colonoscopic splenic injuries are presented. Awareness of this complication is paramount in early recognition and management of this potentially life-threatening injury.
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Iwamuro, Masaya, Kenta Hamada, Seiji Kawano, Yoshiro Kawahara, and Motoyuki Otsuka. "Review of oral and pharyngolaryngeal benign lesions detected during esophagogastroduodenoscopy." World Journal of Gastrointestinal Endoscopy 15, no. 7 (July 16, 2023): 496–509. http://dx.doi.org/10.4253/wjge.v15.i7.496.

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During endoscopy, an endoscopist is inevitably faced with the occasional “difficult colonoscopy,” in which the endoscopist finds it challenging to advance the endoscope to the cecum. Beyond optimization of technique, with minimized looping, minimal insufflation, sufficient sedation, and abdominal splinting when needed, sometimes additional tools may be needed. In this review, we cover available techniques and technologies to help navigate the difficult colonoscopy, including the ultrathin colonoscope, rigidizing overtube, balloon-assisted colonoscopy and the abdominal compression device.
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Rio-Tinto, Ricardo, Jorge Canena, and Jacques Devière. "Candy cane syndrome: A systematic review." World Journal of Gastrointestinal Endoscopy 15, no. 7 (July 16, 2023): 510–17. http://dx.doi.org/10.4253/wjge.v15.i7.510.

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During endoscopy, an endoscopist is inevitably faced with the occasional “difficult colonoscopy,” in which the endoscopist finds it challenging to advance the endoscope to the cecum. Beyond optimization of technique, with minimized looping, minimal insufflation, sufficient sedation, and abdominal splinting when needed, sometimes additional tools may be needed. In this review, we cover available techniques and technologies to help navigate the difficult colonoscopy, including the ultrathin colonoscope, rigidizing overtube, balloon-assisted colonoscopy and the abdominal compression device.
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Wei, Mike T., and Shai Friedland. "Strategies to manage the difficult colonoscopy." World Journal of Gastrointestinal Endoscopy 15, no. 7 (July 16, 2023): 491–95. http://dx.doi.org/10.4253/wjge.v15.i7.491.

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During endoscopy, an endoscopist is inevitably faced with the occasional “difficult colonoscopy,” in which the endoscopist finds it challenging to advance the endoscope to the cecum. Beyond optimization of technique, with minimized looping, minimal insufflation, sufficient sedation, and abdominal splinting when needed, sometimes additional tools may be needed. In this review, we cover available techniques and technologies to help navigate the difficult colonoscopy, including the ultrathin colonoscope, rigidizing overtube, balloon-assisted colonoscopy and the abdominal compression device.
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Wakimoto, Shuichi, Issei Kumagai, and Koichi Suzumori. "Development of Variable Stiffness Colonoscope Consisting of Pneumatic Drive Devices." International Journal of Automation Technology 5, no. 4 (July 5, 2011): 551–58. http://dx.doi.org/10.20965/ijat.2011.p0551.

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Colonoscopy is important and effective medical procedure to detect colonic disorder including cancer of the colon. However, because the large intestine is soft and complex shape, insertion of conventional colonoscopes into the large intestine is difficult, and it depends on doctors’ skill strongly. In many cases, patients feel strong pain. In this research, we aim at development of a novel colonoscope which can change own stiffness partially and realize safe insertion without special techniques. The colonoscope consists of variable stiffness devices. The device is made from silicone rubber and can change its stiffness by pneumatic pressure. In this report, two kinds of variable stiffness devices made from different silicone rubber materials have been developed by molding, and stiffness change characteristics of them are shown experimentally. By applying not only positive pneumatic pressure but also negative pressure, widely stiffness change range is realized. Additionally colonoscopes have been fabricated using them and FMA (Flexible Microactuator). From insertion experiments into the large intestine phantom, advantages and effectiveness have been recognized.
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Chen, Tara, Qiu Tong, and Alexander Kurchin. "Colonoscopic Splenic Injury: A Simplified Radiologic Approach." Case Reports in Gastrointestinal Medicine 2016 (2016): 1–4. http://dx.doi.org/10.1155/2016/2615453.

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Colonoscopy is a commonly performed procedure for diagnosis and treatment of large bowel diseases. Recognized complications include bleeding and perforation. Splenic injury during colonoscopy is a rare complication. We report a case of a 73-year-old woman who presented with left-sided abdominal pain after colonoscopy with finding of splenic injury on CT scan. She was managed conservatively. We discuss the diagnostic and therapeutic approach to colonoscopic splenic injury.
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Dworakowska, D., M. Gueorguiev, P. Kelly, J. P. Monson, G. M. Besser, S. L. Chew, S. A. Akker, et al. "Repeated colonoscopic screening of patients with acromegaly: 15-year experience identifies those at risk of new colonic neoplasia and allows for effective screening guidelines." European Journal of Endocrinology 163, no. 1 (July 2010): 21–28. http://dx.doi.org/10.1530/eje-09-1080.

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ObjectiveIt is suggested that patients with acromegaly have an increased risk of colorectal cancer and pre-malignant adenomatous polyps. However, the optimum frequency with which colonoscopic screening should be offered remains unclear.DesignTo determine the optimum frequency for repeated colonoscopic surveillance of acromegalic patients.MethodsWe retrospectively reviewed the case records of all patients with acromegaly seen in our centre since 1992: 254 patients had at least one surveillance colonoscopy, 156 patients had a second surveillance colonoscopy, 60 patients had a third surveillance colonoscopy and 15 patients had a fourth surveillance colonoscopy.ResultsThe presence of hyperplastic or adenomatous polyps was assessed in all patients, while one cancer was detected at the second surveillance. At the third surveillance, mean (±s.d.) serum IGF1 levels (ng/ml) in patients with hyperplastic polyps were significantly higher than those with normal colons (P<0.05). The presence of an adenoma rather than a normal colon at the first colonoscopy was associated with a significantly increased risk of adenoma at the second (odds ratio (OR) 4.4, 95% confidence interval (CI) 1.9–10.4) and at the third (OR 8.8, 95% CI 2.9–26.5) screens. Conversely, a normal colon at the first surveillance gave a high chance of normal findings at the second (78%) or third surveillance (78%), and a normal colon at the second colonoscopy was associated with normality at the third colonoscopy (81%).ConclusionsRepeated colonoscopic screening of patients with acromegaly demonstrated a high prevalence of new adenomatous and hyperplastic colonic polyps, dependent on both the occurrence of previous polyps and elevated IGF1 levels.
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Dissertations / Theses on the topic "Colonoscopy"

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Arévalo, Carlo, Natalia Chunga, Steven Alarcón, Omar Rodríguez, Fernando Arévalo, Pedro Montes, and Eduardo Monge. "Localización y tamaño de los adenomas del colon como factores asociados a displasia de alto grado." Sociedad de Gastroenterología del Perú (SGP), 2017. http://hdl.handle.net/10757/622552.

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Objetivo: Determinar si la localización y el tamaño de los adenomas de colon se asocian con la presencia de displasia de alto grado en los pacientes de un hospital peruano. Materiales y Métodos: Se realizó un estudio trasversal mediante la revisión de informes de colonoscopías de los años 2014-2015 del Hospital Nacional Daniel Alcides Carrión, incluyéndose los pólipos de pacientes mayores de 18 años; y excluyéndose los de pacientes con cáncer de colon, antecedente de cirugía oncológica, enfermedad inflamatoria intestinal y poliposis (6 o más). Se extrajeron los datos de localización (colon proximal y distal, división a partir del ángulo esplénico), tamaño (menos de 10 mm y 10 mm o más), forma (pediculados y sésiles) y grado de displasia (bajo y alto grado). Se calculó la fuerza de asociación mediante OR, se determinó si existía asociación a través de la prueba Chi cuadrado, con nivel de significancia menor a 0,05. Resultados: De un total de 1710 informes de colonoscopías revisadas, 378 personas tuvieron pólipos, calculando una tasa de detección de adenomas de 22,1%. De los 458 pólipos encontrados 254 fueron adenomas. Se demostró una asociación significativa entre la localización en colon distal y displasia de alto grado (OR 2,68 IC 1,12-6,42, p<0.05); asimismo, los adenomas mayores o iguales a 10 mm tuvieron más riesgo de displasia de alto grado (OR 7,75 IC 3,05-19,69, p<0.05). No se encontró asociación entre la forma de los adenomas y grado de displasia. Conclusión: Se concluye que el tamaño de 10 mm o más y la localización en colon distal se asocian a displasia de alto grado en los adenomas.
Objective: To determine whether localization and size are related to the presence of high-grade dysplasia of colon adenomas in patients of a Peruvian hospital. Materials and methods: This is a descriptive transversal study. We checked colonoscopy reports of 2014-2015 years of Hospital Daniel Alcides Carrion, we included the polyps found in patients older than 18 years old, and excluded reports from patients with colorectal cancer, an antecedent of oncological surgery, inflammatory bowel disease and polyposis (6 or more). We used data based on localization (proximal and distal colon, based on the splenic angle), size (less than 10 mm and 10 mm or more), shape (pediculate and sessile) and grade of dysplasia (low and high-grade). We calculated the strength of association by OR, and we determined whether there was association by Chi-square test with a significance value less than 0.05. Results: We reviewed a total of 1710 of colonoscopy reports, 378 patients had polyps, so the adenoma detection rate was 22.1%. There were 458 polyps, from which 254 were adenomas. From these adenomas, we found an association between distal colon localization and high-grade dysplasia (OR 2.68 IC 1.12-6.42, p<0.05); likewise, there was an association between the size of the adenomas and high-grade dysplasia (OR 7.75 IC 3.05-19.69, p<0.05). We did not find any association between the shape and grade of dysplasia. Conclusion: This study concludes that there is an association between the size of 10 mm or more and localization in the distal colon with high-grade dysplasia of adenomas.
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Pakleppa, Markus. "Development of a colonoscopy simulator for the evaluation of colonoscopy devices." Thesis, University of Dundee, 2016. https://discovery.dundee.ac.uk/en/studentTheses/33a20ce1-cb9e-4f55-8714-3f6762a16b75.

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Colonoscopy is the current standard for colorectal cancer screening. This procedure requires improvement since it causes patient pain and can even result in injury. Novel colonoscopy devices have to be evaluated to gain information about their performance. At the preclinical stage of the device development the evaluation is typically performed in laboratory experiments. For these experiments an artificial environment is required which can recreate the anatomical and biomechanical features of the colon. A colonoscopy simulator for the evaluation of colonoscopy devices was developed within the ERC funded CoDIR project (Colonic Disease Investigation by Robotic Hydrocolonoscopy). The here developed simulator had to provide a colon phantom with realistic biomechanical properties as well as a sensor setup to measure signals which can be used to quantify the performance of devices which are tested within the simulator. Related literature was reviewed and possible tissue mimicking materials were selected. The suitability of the selected materials was evaluated by testing the frictional and elastic properties of the materials and subsequently comparing the results to those of colon tissue. PVA cryogel was selected as the most suitable material as it exhibits comparable elasticity and coefficients of friction. The tissue mimicking materials were mould casted into phantoms which were designed to represent the anatomical features of the colon. A simulator environment was developed which integrates the phantom as well as force and pressure sensors into a functional system. The sensors measure mesenteric forces and intraluminal pressures which can be related to the performance of tested devices. The simulator allows the arrangement of the sensors and the phantoms in an adjustable, modular approach. The simulator environment was successfully applied in the evaluation of a novel colonoscopy device. The results indicate that PVA cryogels exhibit unique mechanical properties which can be compared to those of colon tissue. The developed colonoscopy simulator provides a promising tool which can aid the development of novel colonoscopy devices.
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East, Dr James Edward. "Dysplasia detection at colonoscopy." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511993.

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Ball, Alex. "Improving the quality of colonoscopy." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/11201/.

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Colonoscopy has an important role in the assessment of colonic symptoms and screening for colorectal cancer. Studies suggest that the quality of colonoscopy is variable. The focus of this thesis is improvement of colonoscopy quality, in particular patient comfort and polyp detection which are both important measures of colonoscopy quality. The studies within this thesis examine current medication practices and attitudes towards these and then assess whether simple interventions can improve the quality of colonoscopy. Discomfort during colonoscopy is common and influenced by many factors including the use of medication but practice varies between colonoscopists. Chapter three examines the relationships between medication practice and patient comfort during colonoscopy examinations performed within the English Bowel Cancer Screening Programme. Wide variation in patient comfort and medication use between colonoscopists are noted but with little apparent correlation. Deficiencies in the measurement of patient comfort are highlighted and strategies for improvement are suggested. Many strategies are available to manage discomfort during colonoscopy. Entonox (50:50 combination of nitrous oxide and oxygen) has advantages associated with its rapid elimination but is used in only a minority of examinations. Chapter four examines perceptions and attitudes towards Entonox use among English Bowel Cancer Screening Colonoscopists and explores whether these may explain its low utilisation. Attitudes towards Entonox use varied widely but were generally positive although it appears that Entonox is often selected for patients expected to have little discomfort. Colonoscopists’ attitudes towards Entonox use did not appear to explain its low utilisation. The method of Entonox use during colonoscopy varies between previous studies. Obstetric studies report that the method of Entonox use may influence its efficacy but this had not been examined during colonoscopy. The efficacy and side effects of ‘continuous’ versus ‘as required’ Entonox administration were compared in chapter five. Continuous Entonox administration did not increase potency but was associated with an excess of side effects. Despite colonoscopy being the gold standard technique to examine the colon, polyps may be missed. This is of paramount importance since polyp removal is associated with colorectal cancer prevention. Optimising polyp detection is therefore an important aim of colonoscopy. Polyp detection is influenced by bowel cleanliness. There are many bowel-cleansing agents available including low-volume bowel preparations, which have been advocated as a means to improve patient experience, but their effect on bowel cleanliness is debated. A comparison of bowel cleanliness following a low volume and standard volume bowel preparation before screening colonoscopy is detailed in Chapter six. Minor differences in efficacy were found between bowel preparations in a single colonic segment but there were major differences according to whether the bowel preparation was administered as a single or split dose. Previous studies have suggested position change may aid polyp detection but results are conflicting. Chapter seven compares routine patient position change, during colonoscope withdrawal, versus withdrawal in the supine position throughout. Routine position change significantly increased polyp and adenoma detection in the right colon. The studies within this thesis explore the utility of simple interventions that could easily be adopted by all colonoscopists, and may therefore lead to changes in practice that improve colonoscopy quality.
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Núñez, Do Rio Joan M. "Vascular pattern characterization in colonoscopy images." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/325145.

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El càncer de còlon és el tercer amb més incidència al món i el segon tipus de tumor maligne més comú a Europa. Les tècniques d'exploració directa del còlon han demostrat la seva eficiència en la reducció del nombre de víctimes mortals, permetent la detecció de pòlips en estadis prematurs. Entre les diferents tècniques d'exploració, la colonoscòpia és considerada actualment l'estàndard clínic, tot i que diferents estudis revelen la incidència d'alguns factors en la qualitat de l'exploració. La navegació al llarg del còlon i el recte evidencia una sèrie de reptes per als endoscopistes que provoquen un augment en la taxa d'errors. L'acurada inspecció del còlon ha de ser certificada per tal de minimitzar les possibilitats que alguna lesió no sigui detectada. La inspecció de les imatges de colonoscòpia pot aportar informació crucial per als endoscopistes i donar suport a la navegació durant el procediment. Els vasos sanguinis i els seus patrons de ramificació poden aportar potencial descriptiu per desenvolupar marcadors biomètrics. Els marcadors anatòmics basats en vasos sanguinis podrien ser utilitzats per identificar escenes en vídeos de colonoscòpia i donar suport per a la navegació generant una seqüència d'imatges ordenades en el recorregut de les seccions del colon. Verificant la presència de contingut vascular a l'escena endoluminal també és possible certificar una acurada inspecció de les mucoses i millorar la localització de pòlips. Considerant els usos potencials de la descripció dels vasos sanguinis, aquesta contribució estudia la caracterització del contingut vascular i l'anàlisi de la capacitat descriptiva dels seus patrons de ramificació. La caracterització dels vasos sanguinis en imatges de colonoscòpia suposa reptes importants. L'escena endoluminal inclou diferents objectes amb característiques similars, fet que dificulta el desenvolupament de models diferents per a cadascun d'aquests objectes. Per afrontar aquestes dificultats, proposem l'ús dels patrons de ramificació dels vasos sanguinis com a trets a baix nivell per a la descripció de formes. Hem creat dues bases de dades d'imatges que inclouen la segmentació manual dels arbres vasculars, així com la localització manual de dos tipus de punts d'interès: encreuaments i punts finals. Presentem un model per a la caracterització dels punts d'encreuament en patrons binaris. La implementació del model ens permet desenvolupar un mètode de localització de punts d'encreuament. El mètode supera els algorismes existents a la literatura en experiments en dues bases de dades: una de creació pròpia i la base de dades DRIVE, d'imatges de fons d'ull. En el segon cas, hem creat una extensió amb la localització manual dels punts d'encreuament. Pel fet que volem explorar la capacitat descriptiva de patrons vasculars i punts d'encreuament, proposem una aproximació basada en grafs per crear marcadors anatòmics. En el context de la localització de pòlips, establim un nou mètode per inhibir la influència dels vasos sanguinis en l’extracció d'informació de baix nivell. Els resultats mostren que la nostra metodologia disminueix la influència dels vasos sanguinis, augmenta la informació als pòlips i millora els mètodes de localització de pòlips.
Colorectal cancer is the third most common cancer worldwide and the second most common malignant tumor in Europe. Screening tests have shown to be very effective in reducing the amount of deaths since they allow an early detection of polyps. Among the different screening techniques, colonoscopy is considered the gold standard although clinical studies mention several problems that have an impact in the quality of the procedure. The navigation through the rectum and colon track can be challenging for the physicians which can increase polyp miss rates. The thorough visualization of the colon track must be ensured so that the chances of missing lesions are minimized. The visual analysis of colonoscopy images can provide important information to the physicians and support their navigation during the procedure. Blood vessels and their branching patterns can provide descriptive power to potentially develop biometric markers. Anatomical markers based on blood vessel patterns could be used to identify a particular scene in colonoscopy videos and to support endoscope navigation by generating a sequence of ordered scenes through the different colon sections. By verifying the presence of vascular content in the endoluminal scene it is also possible to certify a proper inspection of the colon mucosa and to improve polyp localization. Considering the potential uses of blood vessel description, this contribution studies the characterization of the vascular content and the analysis of the descriptive power of its branching patterns. Blood vessel characterization in colonoscopy images is shown to be a challenging task. The endoluminal scene is conformed by several objects whose similar characteristics hinders the development of particular models for each of them. To overcome such difficulties we propose the use of the blood vessel branching characteristics as low-level features for pattern description. We created two data sets including manually labeled vessel information as well as manual ground truths of two types of keypoint landmarks: junctions and endpoints. We present a model to characterize junctions in binary patterns. The implementation of the junction model allows us to develop a junction localization method. The proposed method outperforms the available algorithms in the literature in experiments in both, our newly created colon vessel data set, and in DRIVE retinal fundus image data set. In the latter case, we created manual ground truth of junction coordinates. Since we want to explore the descriptive potential of junctions and vessels, we propose a graph-based approach to create anatomical markers. In the context of polyp localization, we present a new method to inhibit the influence of blood vessels in the extraction of low-level profile information. The results show that our methodology decreases vessel influence, increases polyp information and leads to an improvement in state-of-the-art polyp localization performance.
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Patel, Kinesh Pradip. "Developing and evaluating expertise in colonoscopy." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/44961.

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The quality and safety of colonoscopy have become of paramount importance with the worldwide expansion in the utilisation of this procedure, especially with the introduction of colorectal cancer screening in many countries. It is well known that colonoscopic performance varies significantly between practitioners. This thesis explores the effects of assessment in colonoscopy and polypectomy on performance and practice as well as trying to define the factors which differentiate the very best practitioners from the clinically competent. Until 2011, there was no formalised way of certifying polypectomy competence. We looked at the effects of the introduction of mandatory polypectomy assessment on trainee endoscopists applying for certification of competency in the United Kingdom. This work showed that documentation of polypectomy competence significantly improved after these changes were introduced. A global survey of polypectomy practice was undertaken to evaluate international guidance on polypectomy skills training and how trainers deliver teaching on polypectomy around the world, as well as trainees’ experience of gaining polypectomy skills. Significant variability in endoscopists’ experience of polypectomy training was found with few formal national guidelines published. This led to an evaluation of expert endoscopists who underwent an accreditation process with some similarities before commencing Bowel Cancer Screening (BCS). We examined whether it was possible to predict future performance from a single assessment and found that criteria used to assess whether candidates were competent could not predict the best performers from those who passed. Several hundred expert BCS colonoscopists were then monitored over a three year period to determine changes in performance over time and whether long-term performance could be predicted. The best predictors of performance over time for all metrics were initial performance. In order to identify key features of expertise in endoscopy, experienced colonoscopists were interviewed to distinguish characteristics of true endoscopic experts. These interviews revealed the importance of both technical and non-technical skills in defining expertise.
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Khosla, Manraj. "Hemoperitoneum as a Consequence of Colonoscopy." AMER COLL GASTROENTEROLOGY, 2016. http://hdl.handle.net/10150/622922.

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Hemoperitoneum without evidence of organ damage is a rare complication of colonoscopy. It is most frequently seen in association with splenic rupture due to traction on the splenocolic ligament. In our case, we present a 48-year-old cirrhotic man who developed peritoneal bleeding during a diagnostic colonoscopy for iron deficiency anemia. However, he was without signs of splenic damage or colon perforation. We suggest that the most likely source of bleeding is a ruptured portal-caval collateral vessel based on a computed tomography performed following the procedure.
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Al-Madi, Majid. "Factors effecting adenoma detection during screening colonoscopy." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104588.

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Background. Adenoma detection rate (ADR) has been associated with the incidence of interval colorectal cancer (CRC) in patients undergoing screening colonoscopy. Objective. This study aimed to identify factors that effect adenoma detection during screening colonoscopy. Methods. A retrospective cross sectional study was conducted of patients who underwent screening colonoscopy between June 1st and August 25th 2009 at the McGill University Health Center. Variables were abstracted from two electronic databases: Endoworks (for colonoscopy reports) and OACIS (for pathology reports for polyps removed). Multivariable logistic regression analysis was performed using the software R to determine the association between patient, colonoscopy, endoscopist related variables, and adenoma detection.Results. 430 sequentially performed colonoscopies met eligibility criteria and were included. In univariable analysis, higher likelihood of detecting adenomas was associated with male patients, increasing patient age, prior polyp removal, photo-documentation of the cecum, and increasing number of polyps detected; a lower likelihood of detecting adenomas was associated with average risk for CRC, colonoscopy performed by surgeon, increasing number of endoscopies and colonoscopies before the index colonoscopy, and increasing duration of time in the endoscopy unit. In multivariable analysis, increased likelihood of adenoma detection was associated with increasing patient age (in years) OR 1.04 (95%CI, 1.02 to 1.07), the more polyps detected the higher the odds of detecting an adenoma (OR 3.71 (95%CI, 2.70 to 5.10), while lower likelihood for detecting adenoma was increased time (in hours) from the beginning of the endoscopy session till the index colonoscopy (OR 0.51 (95%CI, 0.31 to 0.79). Conclusions. In addition to patient characteristics, operator fatigue, as evidenced by a decrease in adenoma detection as time progresses from the start of the endoscopy session, is an important factor that should be considered in endoscopy scheduling. Further research is required to evaluate factors that would optimize the adenoma detection and performance of colonoscopy as a screening tool for CRC.
Contexte. Le taux de détection d'adénome (TDA) a été associé avec l'incidence intervalle subséquente du cancer colorectal (CRC) chez les patients subissant une coloscopie de dépistage. Objectif. Cette étude visait à identifier les facteurs affectant la détection d'adénome au cours d'une coloscopie de dépistage.Méthodes Une étude rétrospective transversale a été menée chez les patients ayant subi une coloscopie de dépistage entre le 1er Juin et 25 août 2009 au Centre universitaire de Santé McGill. Les variables ont été extraites à partir de deux bases de données électroniques Endoworks (pour les rapports de coloscopie) et OACIS (rapports de pathologie pour les polypes enlevés). Une analyse multivariable de régression logistique a été effectuée en utilisant le logiciel R. Résultats. 430 coloscopies effectuées successivement rencontrèrent les critères d'admissibilité et ont été incluses. En analyse univariable, une probabilité de détection d' adénomes accrue a été notée chez les patients de sexe masculin, plus àgés, ayant eu une ablation de polypes antécédente, s'il y avait eu photo-documentation du caecum, et avec la présence d'un nombre de polypes plus élevés. La probabilité de détecter un adénome était affaiblie chez les patients à risque moyen de CCR, si la coloscopie était effectuée par un chirurgien, et avec un nombre croissant d'endoscopies et coloscopies complétées avant la coloscopie le même jour, ainsi qu'en augmentant la durée de temps passé ce jour-là dans l'unité d'endoscopie. En analyse multivariable, une augmentation de la probabilité de détection d'adénome a été associée avec l' augentation de l'âge du patient (en années) (OR=1,04 (IC 95% (1,02 à 1,07)), un nombre accru de polypes détectés (OR = 3,71 ( 95% IC, 2,70 à 5,10), tandis qu'une plus faible probabilité de détection d'adénome était associée avec une augmentation du temps (en heures) passé depuis le début de la session endoscopie jusqu'à la coloscopie de dépistage donnée (OR 0,51 (IC 95%: 0,31 à 0,79). Conclusions. En plus des caractéristiques de patients reconnus, la fatigue de l'endoscopiste, telle que reflétée par le temps écoulé depuis le début de la session d'endoscopie est associée avec une diminution significative du taux de détection d' adénomes. Ce facteur important doit donc être pris en compte dans la planification de la liste d'endoscopie dans un contexte de dépistage. D'autres recherches sont nécessaires pour évaluer les facteurs qui permettent d'optimiser la détection des adénomes et la performance de la coloscopie comme outil de dépistage pour le CCR.
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Dogramadzi, Sanja. "Sensors and actuators in computer controlled colonoscopy." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369813.

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Kale, Ravindra V. "Evaluation of an Active Colonoscopy Training Model." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1350759066.

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Books on the topic "Colonoscopy"

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Waye, Jerome D., Douglas K. Rex, and Christopher B. Williams, eds. Colonoscopy. Oxford, UK: Blackwell Publishing Ltd, 2003. http://dx.doi.org/10.1002/9780470986943.

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Waye, Jerome D., Douglas K. Rex, and Christopher B. Williams, eds. Colonoscopy. Oxford, UK: Wiley-Blackwell, 2009. http://dx.doi.org/10.1002/9781444316902.

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Sonoda, Toyooki, ed. Advanced Colonoscopy. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-1584-2.

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Waye, Jerome D., James Aisenberg, and Peter H. Rubin. Practical Colonoscopy. Oxford, UK: Blackwell Publishing Ltd., 2013. http://dx.doi.org/10.1002/9781118553442.

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Lefere, P., and S. Gryspeerdt, eds. Virtual Colonoscopy. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-79886-6.

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Lefere, Philippe, and Stefaan Gryspeerdt, eds. Virtual Colonoscopy. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-30904-7.

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M, Galdino Gregory, ed. Virtual colonoscopy. Philadelphia: Lippincott Williams & Wilkins, 2008.

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name, No. Atlas of virtual colonoscopy. New York, NY: Springer, 2003.

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Dachman, Abraham H., and Andrea Laghi, eds. Atlas of Virtual Colonoscopy. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-5852-5.

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Dachman, Abraham H., ed. Fundamentals of Virtual Colonoscopy. New York, NY: Springer New York, 2005. http://dx.doi.org/10.1007/b138780.

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Book chapters on the topic "Colonoscopy"

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Sedlack, Robert E. "Colonoscopy." In Successful Training in Gastrointestinal Endoscopy, 42–72. Oxford, UK: Wiley-Blackwell, 2011. http://dx.doi.org/10.1002/9781444397772.ch5.

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Knowlton, Christin A., Michelle Kolton Mackay, Tod W. Speer, Robyn B. Vera, Douglas W. Arthur, David E. Wazer, Rachelle Lanciano, et al. "Colonoscopy." In Encyclopedia of Radiation Oncology, 131–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-540-85516-3_212.

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Engin, Omer, Gizem Kilinc, and Oguzhan Sunamak. "Colonoscopy." In Colon Polyps and Colorectal Cancer, 45–74. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57273-0_3.

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Abbasi, Adeel, Francis DeRoos, José Artur Paiva, J. M. Pereira, Brian G. Harbrecht, Donald P. Levine, Patricia D. Brown, et al. "Colonoscopy." In Encyclopedia of Intensive Care Medicine, 591. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-00418-6_1378.

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Engin, Omer, Mebrure Evnur Uyar, Oguzhan Sunamak, and Fuat Ipekci. "Colonoscopy." In Colon Polyps and the Prevention of Colorectal Cancer, 41–112. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17993-3_5.

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Sugarman, Ian D., and Jonathan R. Sutcliffe. "Colonoscopy." In Operative Pediatric Surgery, 57–63. 8th edition. | Boca Raton CRC Press, 2020.: CRC Press, 2020. http://dx.doi.org/10.1201/9781351250801-7.

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Gathright, J. Byron. "Colonoscopy." In Ambulatory Anorectal Surgery, 173–86. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1196-9_14.

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Smith, C. Daniel, Aaron S. Fink, Gregory Van Stiegmann, and David W. Easter. "Therapeutic Colonoscopy, Complications of Colonoscopy." In The SAGES Manual, 565–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-88454-2_69.

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Rex, Douglas K. "Advanced Colonoscopy, Polypectomy, and Colonoscopic Imaging." In Practical Gastroenterology and Hepatology: Small and Large Intestine and Pancreas, 53–57. Oxford, UK: Wiley-Blackwell, 2010. http://dx.doi.org/10.1002/9781444328417.ch8.

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Rahmani, Farrah, and Douglas K. Rex. "Advanced Colonoscopy, Polypectomy, and Colonoscopic Imaging." In Practical Gastroenterology and Hepatology Board Review Toolkit, 1–4. Oxford, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119127437.ch101.

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Conference papers on the topic "Colonoscopy"

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Tutcu, Cem, Seref Kemal Talas, Ozgur Kocaturk, Nurdan Tozun, and Evren Samur. "Proof of Concept of a Novel Growing Soft Robot for Colonoscopy." In THE HAMLYN SYMPOSIUM ON MEDICAL ROBOTICS. The Hamlyn Centre, Imperial College London London, UK, 2023. http://dx.doi.org/10.31256/hsmr2023.54.

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Colonoscopy is considered to be the gold standard for the detection of colorectal polyps and other colonic disease. In this study, a novel growing soft-continuum robot is presented as a proof of concept for a potential colonoscopy application. Compared to the state-of-the- art systems such as the ColonoSight system [1] using an inflated balloon attached over the colonoscope shaft, or Neoguide [2] actuated via electromechanical actu- ators, the proposed architecture utilizes the advantage of pneumatic propulsion as well as allowing control in three degrees of freedom. The growing robot concept pushes the end effector from the tip and prevents loss in propulsion force at the tip that results a lower mechanical forcing on the colon. Since the actuation is performed pneumatically and controlled via electromechanical in- terface, there is no need for users to apply high forces for pushing/pulling to progress and maneuver the robot.
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Hampton, K. K., H. Hariman, P. J. Grant, and C. R. M. Prentice. "HAEMOSTATIC RESPONSES TO VASOPRESSIN RELEASE DURING COLONOSCOPY." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644135.

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Vasopressin (aVP) infusions resulting in plasma concentrations comparable to those occurring during stress result in increasesinfactor VIII coagulant activity (FVIIIC) and increases in plasminogenactivator activity (PAA) as measuredby shortening of the euglobulin clot lysis time (ECLT). During major abdominal surgey aVP release is accompanied by similar changes in FVIII, PAA and FPA. The relative contributions of vasopressin release and tissue damage during the surgical procedure are not clear. The aim of this study was to investigate haemostatic changes during colonoscopy where bowel manipulation results in endogenous vasopressin release, but surgical tissue damage is absent. The study was performed in 12 patients undergoing routine colonoscopy. Sedation was achieved with pethidine 50 mg and midazolam 5 mg. Samples were taken after sedation, with the colonoscope in the caecum representing maximal bowel manipulation, and 15 minutes after the end of the procedure. Samples were taken for aVP, ECLT, FVIII and fibrinopeptide A (FPA). In 8 patients a complete procedure was performed. Median aVP concentration rose from 0.5 before to 153 pg/ml at maximal bowel manipulation (p < 0.02), PAA rose from 100 to 508% (p < 0.008) and FVIII from 100 to 218% (p < 0.02). The rise in aVP correlated with PAA (r = 0.68 p < 0.004) and FVIIIC (r = 0.74 p < 0.001). In 4 patients the procedure was terminated prematurely after minimal bowel manipulation. Plasma aVP did not change from 0.5 pg/ml and there were no significant changesin PAA andFVIIIC when colonoscopy was abandoned. FPA concentrations did not alter significantly in eithergroup. The results suggest endogenous vasopressin release occurs during colonoscopy and is associated with increased PAA and FVIIIC, providing further evidence that vasopressin has a role in the regulation of haemostasis during stress. The lack of chang in FPA suggests vasopressin release does not initiate thrombin generation and that tissue damage is necessary as the stimulus for fibrin formation.
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Amlani, B., P. Bhandari, and F. Radaelli. "PUBLIC ATTITUDES TO COLONOSCOPY: EXPERIENCE OF COLONOSCOPY." In ESGE Days 2019. Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0039-1681635.

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Hong, Wei, Jianning Wang, Feng Qiu, Arie Kaufman, and Joseph Anderson. "Colonoscopy simulation." In Medical Imaging, edited by Armando Manduca and Xiaoping P. Hu. SPIE, 2007. http://dx.doi.org/10.1117/12.709665.

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Durr, Nicholas J., Taylor L. Bobrow, Suchapa Arayakarnkul, and Saowanee Ngamruengphong. "Computational colonoscopy." In Molecular-Guided Surgery: Molecules, Devices, and Applications X, edited by Summer L. Gibbs, Brian W. Pogue, and Sylvain Gioux. SPIE, 2024. http://dx.doi.org/10.1117/12.3009912.

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Kumar, R. Rajesh, Jinu Joseph, P. V. Vidya, C. Pournami, and N. J. John. "Virtual colonoscopy: A plausible alternative to conventional colonoscopy." In 2017 IEEE Region 10 Symposium (TENSYMP). IEEE, 2017. http://dx.doi.org/10.1109/tenconspring.2017.8070107.

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Bhandari, P., B. Amlani, and F. Radaelli. "PUBLIC ATTITUDES TO COLONOSCOPY: EMBARRASSMENT LEVELS AND COLONOSCOPY." In ESGE Days 2019. Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0039-1681538.

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Bhandari, P., B. Amlani, and F. Radaelli. "PUBLIC ATTITUDES TO COLONOSCOPY: THE PURPOSE OF COLONOSCOPY." In ESGE Days 2019. Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0039-1681575.

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Hunt, Gordon W., Paul F. Hemler, and David J. Vining. "Automated virtual colonoscopy." In Medical Imaging 1997, edited by Yongmin Kim. SPIE, 1997. http://dx.doi.org/10.1117/12.273933.

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Tscherwinski, N., F. Straulino, A. Genthner, S. Kangalli, and A. Eickhoff. "COLONOSCOPY WITH THE 3D NAVIGATION SYSTEM SCOPEPILOT VERSUS STANDARD COLONOSCOPY." In ESGE Days 2019. Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0039-1681385.

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Reports on the topic "Colonoscopy"

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Fiori, Marcelo, Pablo Muse, and Guillermo Sapiro. A Complete System for Polyps Flagging in Virtual Colonoscopy. Fort Belvoir, VA: Defense Technical Information Center, April 2011. http://dx.doi.org/10.21236/ada540725.

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Liang, Tao, Xue Jing, Xueguo Sun, Ying Liu, Xianli Dou, and Lingyun Zhang. How to control pain of the conscious elective colonoscopy with new techniques: a meta-analysis comparing water-assisted and carbon dioxide insufflation methods for colonoscopy. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, January 2021. http://dx.doi.org/10.37766/inplasy2021.1.0057.

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Liu, Yafeng, and Fan Zhang. A meta-analysis of different hralth education models for intestinal preparation before colonoscopy. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, March 2022. http://dx.doi.org/10.37766/inplasy2022.3.0155.

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Gao, Hai-de. Impact of cuff-assisted colonoscopy for adenoma detection: a protocol of systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, April 2020. http://dx.doi.org/10.37766/inplasy2020.4.0042.

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F. Al-Sanea, Hamad. Evaluation of Recent Surgical Updates Regarding Diagnosis and Management of Diverticulitis. Science Repository, April 2024. http://dx.doi.org/10.31487/j.jsr.2024.01.01.

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Diverticulosis occurs when small, bulging pouches (diverticula) develop in your digestive tract. When one or more of these pouches become inflamed or infected, the condition is called diverticulitis. Diverticula are small, bulging pouches that can form in the lining of your digestive system, although it was rare before the 20th century, diverticular disease is now one of the most common health problems in the western world. It’s a group of conditions that can affect your digestive tract. The most serious type of diverticular disease is diverticulitis. It can cause uncomfortable symptoms and, in some cases, serious complications. If left untreated, these complications can cause long-term health problems. Read on to learn more about diverticulitis, including its causes, symptoms, treatment options, and how your diet might affect your risk of developing it. Objective: In this paper, our main focus was on diverticulitis and surgical intervention, and only relevant studies were discussed. Methodology: PubMed database was used for articles selection, and papers on diverticulitis were obtained and reviewed. Conclusion: Colonoscopy is best avoided in acute and uncomplicated diverticulitis. Classically, it is a surgical disease but uncomplicated cases can often be managed conservatively. Follow up of treated diverticulitis occurs after four weeks via colonoscopy, in selected cases assessing the risk of developing colonic cancer. Novel therapies are under-studied and are probable replacements for surgical intervention.
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Li, Yaodong, Zuoqiong Zhou, Yiping WANG, Gang MAI, Yangyun HANG, Lingling ZHU, Ming ZHAO, et al. Comparison of oral sodium phosphate tablets and polyethylene glycol lavage solution for colonoscopy preparation: A systematic review and meta-analysis of randomized clinical trials. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, May 2023. http://dx.doi.org/10.37766/inplasy2023.5.0013.

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Review question / Objective: To systematically compare the bowel cleaning ability, patient tolerance and safety of oral sodium phosphate tablets (NaPTab) and oral polyethylene glycol electrolyte lavage solution (PEGL) to inform clinical decision making. Review question include: 1) patient populations with an indication for colonoscopy, including outpatients or inpatients requiring diagnosis or treatment, 2) randomized controlled trial (RCT) study designs, 3) a sodium phosphate tablet intervention group, 4) a control group receiving PEGL administered orally or by nasogastric tube, and 5) outcome measures including cleansing quality, adverse effects, patient acceptance, and changes in serum electrolytes after preparation.
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Tian, Xu, Hui Chen, Yang Han, and Maria Jiménez-Herrera. Comparative effectiveness of enhanced patient instructions for bowel preparation before colonoscopy: a systematic review and network meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, December 2020. http://dx.doi.org/10.37766/inplasy2020.12.0103.

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Song, Wenjie, ShengHan Lou, and Yanlong Liu. Artificial intelligence in colonoscopy for reducing missed adenomas and polyps: a systematic review and meta-analysis of randomized clinical trials. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, September 2023. http://dx.doi.org/10.37766/inplasy2023.9.0094.

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Wei, Yaping, Guofan Shen, Yutong Yang, Zheng Jin, Wei Hu, and Ying Zhu. Inspection and polypectomy during both insertion and withdrawal or only during withdrawal of colonoscopy? a protocol for systematic review and meta analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, May 2020. http://dx.doi.org/10.37766/inplasy2020.5.0051.

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Wang, Yi, Liupu Zheng, Mengqian Ye, Jun Ma, Chen Jin, Yan Yang, Haoqi Li, and Rongyuan Zheng. Effects of adding adjuvants to propofol on the post-anesthesia cognitive function in patients undergoing gastroscopy/colonoscopy: A systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, November 2023. http://dx.doi.org/10.37766/inplasy2023.11.0092.

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