Publications by authors named "Udayakumar Navaneethan"

Background: Precision-guided dosing (PGD) is a personalized tool that optimizes clinical decision-making in the treatment of inflammatory bowel disease (IBD) with infliximab (IFX) and its biosimilars. PGD employs nonlinear mixed-effect models using patient-specific pharmacokinetic parameters to predict infliximab trough concentrations without the need to wait until the actual trough measurement. This approach calculates patient-specific clearance (CL) and provides tailored IFX dosing and administration intervals aimed at achieving target trough levels.

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Disconnected pancreatic duct (DPD) and the associated syndrome are increasingly recognized as complications of severe pancreatitis. Despite the increased appreciation for this disorder and its treatment, there remain many questions regarding definition, diagnosis, and management. We utilized the expertise of the U.

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Article Synopsis
  • Video capsule endoscopy is the leading method for examining issues in the small intestine, but it poses a risk of retaining the capsule inside the body.
  • The text discusses two specific cases where endoscopy capsules were retained and outlines a minimally invasive method for retrieving them.
  • It reviews existing literature on capsule retention, including various medical, surgical, and preventive approaches to manage the issue.
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Advanced endoscopic imaging including high-definition endoscopy, confocal laser endomicroscopy (CLE) and endocytoscopy (EC) serve as an adjunct to predict clinical outcomes in inflammatory bowel disease (IBD). CLE can identify gut barrier dysfunction which correlates with disease behavior and long-term disease outcome. EC allows the assessment of histologic activity.

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Endoscopy plays a key role in diagnosis, monitoring of disease activity, assessment of treatment response, dysplasia surveillance, postoperative evaluation, and interventional therapy for patients with inflammatory bowel disease (IBD). Clinical practice patterns in the endoscopic management of IBD vary. A panel of experts consisting of IBD specialists, endoscopists, and GI pathologists participated in virtual conferences and developed this modified Delphi-based consensus document to address endoscopic aspects of IBD management.

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Article Synopsis
  • - The study investigates the effectiveness of endoscopic ultrasound (EUS)-guided celiac plexus block versus a sham procedure in alleviating abdominal pain for patients suffering from chronic pancreatitis, with the aim of determining pain reduction statistics.
  • - Conducted as a randomized sham-controlled trial, the research will involve multiple academic sites and focus on patients whose chronic pancreatitis is confirmed by EUS diagnostic criteria, measuring outcomes like pain reduction through specific pain assessment tools.
  • - The ultimate goal is to provide a clear evaluation of celiac plexus block’s efficacy compared to a placebo treatment, which may help in managing chronic pain related to pancreatitis more effectively.
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Background: Successful Crohn's disease (CD) therapy relies on timely and precise management strategies. Endoscopic balloon dilation (EBD) has been applied as a first-line treatment for symptomatic CD-associated strictures due to its minimally invasive nature and the possibility of preserving intestinal length.

Objective: The aim of the present study was to determine patient-related predictive factors associated with the need for surgery for CD-associated ileocolic strictures after technically successful EBD.

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This clinical practice guideline from the American Society for Gastrointestinal Endoscopy provides an evidence-based approach for the role of therapeutic EUS in the management of biliary tract disorders. This guideline was developed using the Grading of Recommendations Assessment, Development and Evaluation framework and addresses the following: 1: The role of EUS-guided biliary drainage (EUS-BD) versus percutaneous transhepatic biliary drainage (PTBD) in resolving biliary obstruction in patients after failed ERCP. 2: The role of EUS-guided hepaticogastrostomy versus EUS-guided choledochoduodenostomy in resolving distal malignant biliary obstruction after failed ERCP.

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Background: Bowel ultrasonography (BUS) is emerging as a promising noninvasive tool for assessing disease activity in inflammatory bowel disease (IBD) patients. We evaluated the diagnostic accuracy of BUS in IBD patients against the gold standard diagnostic method, standard colonoscopy.

Methods: Major databases were searched from inception to May 2023 for studies on BUS diagnostic accuracy in IBD.

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Background: Standard linear echoendoscopes have a large distal tip and bending radius, which can preclude adequate examination in some patients.

Objective: We examined the impact of having available slim linear echoendoscopes (SLE) on our endoscopic ultrasound (EUS) practice.

Materials And Methods: As a quality improvement measure, data on the need for the use of SLE were documented in 2000 consecutive procedures performed over a 10-month period from February to November 2022.

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Background: Although the preferred management approach for patients with infected necrotising pancreatitis is endoscopic transluminal stenting followed by endoscopic necrosectomy as step-up treatment if there is no clinical improvement, the optimal timing of necrosectomy is unclear. Therefore, we aimed to compare outcomes between performing upfront necrosectomy at the index intervention versus as a step-up measure in patients with infected necrotising pancreatitis.

Methods: This single-blinded, multicentre, randomised trial (DESTIN) was done at six tertiary care hospitals (five hospitals in the USA and one hospital in India).

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Objectives: Approach to management of common bile duct stones (CBDS) by endoscopic retrograde cholangiopancreatography (ERCP) is not standardized. We examined outcomes by applying predetermined protocol for CBDS management.

Methods: When standard extraction techniques failed at ERCP, presence of tapered bile duct and stone-duct ratio were calculated.

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Background: Walled-off necrosis (WON) is highly morbid disease most effectively managed by endoscopic drainage with lumen-apposing metal stents (LAMSs) or plastic stents, with or without necrosectomy. This meta-analysis compared the clinical outcomes of patients included in randomized trials treated using LAMSs or plastic stents.

Methods: The MEDLINE and EMBASE databases were searched to identify all data collected from randomized trials comparing LAMSs and plastic stents for the treatment of WON.

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Article Synopsis
  • The study evaluates the effectiveness of convolutional neural network (CNN) algorithms in diagnosing the severity of ulcerative colitis (UC) using endoscopic images, comparing two scoring systems: the Mayo Endoscopic Score (MES) and the Ulcerative Colitis Endoscopic Index of Severity (UCEIS).
  • A meta-analysis of 12 studies showed that CNN algorithms achieved a high accuracy of 91.5%, with notable sensitivity (82.8%) and specificity (92.4%) for assessing UC severity.
  • Results indicated that the UCEIS scoring system outperformed MES in terms of sensitivity and positive predictive value, emphasizing the need for further research to confirm these findings in clinical practice.
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Objective: To study the impact of endoprosthesis type on inflammatory response in patients undergoing endoscopic ultrasound (EUS)-guided drainage of pancreatic fluid collections (PFC).

Methods: Patients undergoing EUS-guided PFC drainage and treated using lumen-apposing metal stents (LAMS) or plastic endoprostheses constituted the study cohort. The primary outcome was the presence of systemic inflammatory response syndrome (SIRS) after index intervention.

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Introduction: Artificial intelligence (AI), by means of computer vision in machine learning, is a promising tool for cholangiocarcinoma (CCA) diagnosis. The aim of this study was to provide a comprehensive overview of AI in medical imaging for CCA diagnosis.

Methods: A systematic review with scientometric analysis was conducted to analyze and visualize the state-of-the-art of medical imaging to diagnosis CCA.

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Background: Artificial intelligence (AI), when applied to computer vision using a convolutional neural network (CNN), is a promising tool in "difficult-to-diagnose" conditions such as malignant biliary strictures and cholangiocarcinoma (CCA). The aim of this systematic review is to summarize and review the available data on the diagnostic utility of endoscopic AI-based imaging for malignant biliary strictures and CCA.

Methods: In this systematic review, PubMed, Scopus and Web of Science databases were reviewed for studies published from January 2000 to June 2022.

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Strictures in inflammatory bowel disease (IBD) usually occur because of long-standing inflammation and fibrosis causing luminal narrowing. Strictures in the setting of Crohn's disease (CD) can occur de novo, or in the postsurgical setting (anastomotic strictures). Historically these strictures are managed with invasive surgical procedures which may result in considerable morbidity.

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Surveillance pouchoscopy is recommended for patients with restorative proctocolectomy with ileal pouch-anal anastomosis in ulcerative colitis or familial adenomatous polyposis, with the surveillance interval depending on the risk of neoplasia. Neoplasia in patients with ileal pouches mainly have a glandular source and less often are of squamous cell origin. Various grades of neoplasia can occur in the prepouch ileum, pouch body, rectal cuff, anal transition zone, anus, or perianal skin.

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Pouchitis, Crohn's disease of the pouch, cuffitis, polyps, and extraintestinal manifestations of inflammatory bowel disease are common inflammatory disorders of the ileal pouch. Acute pouchitis is treated with oral antibiotics and chronic pouchitis often requires anti-inflammatory therapy, including the use of biologics. Aetiological factors for secondary pouchitis should be evaluated and managed accordingly.

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