Publications by authors named "Ravi P Kiran"

Background: Strictures are a common complication after ileal pouch surgery with the most common locations being at the anastomosis, pouch inlet, and stoma closure site. No previous literature has described endoscopic therapy of stoma site stricture. This study aimed to assess the safety and efficacy of endoscopic therapy in the treatment of stoma closure site strictures.

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The treatment of anorectal strictures is particularly challenging and historically focused on surgical resection and/or diversion. There are a number of endoscopic options, but repeat interventions are common. The use of the needle knife stricturotomy technique as an alternative to surgery in the treatment of a variety of strictures has been described, but its use for the treatment of severe anorectal and anopouch strictures has not been studied.

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Background: The IPAA has been successful in restoring intestinal continuity and preserving continence in the majority of patients requiring a proctocolectomy. However, a subset of individuals experience significant complications that might result in pouch failure. The conversion of the J-pouch to a continent ileostomy pouch represents a significant surgical procedure.

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Article Synopsis
  • Intestinal transplantation is the best option for treating intestinal failure, but it comes with complications like tissue rejection, which requires strong immunosuppression, potentially leading to further issues.
  • Researchers propose a noninvasive method to monitor the health of intestinal grafts by analyzing ileal fluid from ileostomies for specific antimicrobial peptides and proteins, which reflect inflammation and homeostasis in the intestines.
  • By using enzyme-linked immunosorbent assays (ELISAs), the study shows that accurately measuring these molecules in ileal effluent can provide reliable insight into the intestinal health of patients with ileostomies, potentially improving current assessment methods.
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Background: Anal fistulae are common, predominantly cryptoglandular, and almost invariably require surgical treatment. Recurrences are common for procedures other than fistulotomy regardless of technique and adequacy of repair. Growing evidence supports the pivotal role of specific intestinal bacteria in anastomotic failures after bowel resection.

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Introduction: For patients with cancer or injury of the esophagus, esophagectomy with reconstruction using the stomach (gastric pull-up, GPU) or colon (colonic interposition, CI) can restore function but is associated with high morbidity. We sought to describe the differences in outcomes between the two replacement organs using a national database.

Methods: From ACS-NSQIP, patients who underwent GPU or CI between 2006 and 2020 were identified.

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Post-colonoscopy consults empower patients to make informed decisions around their subsequent treatment, and non-compliance with these consults ("no-shows") hinders disease management. There is a paucity in the literature regarding self-adherence to post-colonoscopy consults in resource-limited settings such as South Africa. An understanding of self-adherence to post-colonoscopy consults in this setting is required to establish whether improved interventions are needed, and what specific elements of self-adherence should be addressed with these interventions.

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Unlabelled: Predicting in vivo response to antineoplastics remains an elusive challenge. We performed a first-of-kind evaluation of two transcriptome-based precision cancer medicine methodologies to predict tumor sensitivity to a comprehensive repertoire of clinically relevant oncology drugs, whose mechanism of action we experimentally assessed in cognate cell lines. We enrolled patients with histologically distinct, poor-prognosis malignancies who had progressed on multiple therapies, and developed low-passage, patient-derived xenograft models that were used to validate 35 patient-specific drug predictions.

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This systematic review was conducted to investigate predictors of treatment refusal in colorectal cancer (CRC) patients. An understanding of these predictors would inform statistical models for the identification of high-risk patients who might benefit from interventions that seek to improve treatment compliance. We performed a search of PubMed and Scopus to identify potentially relevant studies on predictors of treatment refusal in CRC patients that were published between January 1, 2000 and December 31, 2021.

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Crohn's disease (CD) can involve the entire gastrointestinal tract from the mouth to the anus and can lead to a constellation of symptoms. With the advancement of effective medical treatments for CD, a tendency has emerged to consider surgical treatment as a last resort. This potentially has the disadvantage of delaying surgery and if it fails might leave patients sicker, less well nourished, and with more severe complications.

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The complication rate after surgery in patients with inflammatory bowel disease is high owing to chronic inflammatory and suboptimal physiologic state, the effect of steroids and immunosuppressive medication, and the inherent complexity of the surgical procedures. Although some of the complications after surgery are similar for Crohn disease and ulcerative colitis, others are specific to the diagnosis. Complications are divided into early postoperative and late complications.

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Background: Continent ileostomy was first introduced by Nils Kock in 1969 as Kock pouch (K-pouch). Its most characteristic feature, the nipple valve that offers continence' was a later addition. Even though today's continent ileostomy is sidelined by ileal pouch-anal anastomosis as the gold standard of restorative procedures for colectomy patients, it remains an excellent option for select patients, offering an alternative to end-ileostomy or a poorly functioning ileoanal pouch.

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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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Background: Current clinical dogma favors universal inpatient admission after colorectal resection particularly in the presence of an anastomosis.

Objective: We evaluate the feasibility and safety of ambulatory surgery in carefully selected patients undergoing colorectal resection/anastomosis.

Methods: Between October 2020 and October 2021, all patients undergoing colorectal resection/anastomosis meeting specific criteria {no major comorbidity [American Society of Anesthesiologist (ASA) <4], not on therapeutic anticoagulation, compliant patient/family} were counseled preoperatively for ambulatory surgery (discharge <24 h postsurgery).

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Clinical outcomes in colorectal cancer (CRC) correlate with T cell infiltrates, but the specific contributions of heterogenous T cell types remain unclear. To investigate the diverse function of T cells in CRC, we profiled 37,931 T cells from tumors and adjacent normal colon of 16 patients with CRC with respect to transcriptome, TCR sequence, and cell surface markers. Our analysis identified phenotypically and functionally distinguishable effector T cell types.

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Background: Risk prediction models for postoperative mortality after intra-abdominal surgery have typically been developed using preoperative variables. It is unclear if intraoperative data add significant value to these risk prediction models.

Methods: With IRB approval, an institutional retrospective cohort of intra-abdominal surgery patients in the 2005 to 2015 American College of Surgeons National Surgical Quality Improvement Program was identified.

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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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Restorative proctocolectomy with ileal pouch-anal anastomosis is an option for most patients with ulcerative colitis or familial adenomatous polyposis who require colectomy. Although the construction of an ileal pouch substantially improves patients' health-related quality of life, the surgery is, directly or indirectly, associated with various structural, inflammatory, and functional adverse sequelae. Furthermore, the surgical procedure does not completely abolish the risk for neoplasia.

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Background: Positive circumferential resection margin is a predictor of local recurrence and worse survival in rectal cancer. National programs aimed to improve rectal cancer outcomes were first created in 2011 and continue to evolve. The impact on circumferential resection margin during this time frame has not been fully evaluated in the United States.

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Background: Pouchitis is the most common long-term complication in patients requiring colectomy ileal pouch-anal anastomosis with medically refractory ulcerative colitis or colitis-associated neoplasia. A previous small case series suggests associated between portal vein thrombosis (PVT) and ischemic pouchitis.

Aim: To evaluate the association between PVT and other demographic and clinical factors and pouchitis.

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Ileal pouch-anal anastomosis is the surgical procedure of choice for patients who require colectomy for complicated ulcerative colitis with or without associated dysplasia and familial adenomatous polyposis. Leaks from the suture lines or anastomosis can lead to pouch failure. Treatment options have been radiographic drainage and surgical intervention.

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