Publications by authors named "Nathaniel Cohen"

Article Synopsis
  • - The study examined the use of the modified pouchitis disease activity index (mPDAI) to assess symptoms and endoscopic findings among different pouchitis phenotypes in inflammatory bowel disease (IBD).
  • - A total of 103 IBD patients were analyzed, revealing that patients with normal pouches had a median mPDAI of 0, while those with cuffitis had the highest median score of 4.0, indicating more severe symptoms.
  • - The findings suggested that the mPDAI may have limited effectiveness in differentiating between various inflammatory phenotypes, prompting the need for further research to identify which symptoms should be monitored.
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This article explores the pulmonary complications associated with inflammatory bowel disease (IBD). It presents a detailed case study of a 22-year-old male with Crohn's disease exhibiting pulmonary symptoms. The review delves into the spectrum of pulmonary involvement in IBD, covering clinical presentations, diagnostic challenges, underlying pathophysiology, and management strategies.

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Background: Patients with inflammatory bowel disease (IBD) who undergo proctocolectomy with ileal pouch-anal anastomosis may develop pouchitis. We previously proposed a novel endoscopic classification of pouchitis describing 7 phenotypes with differing outcomes. This study assessed phenotype transitions over time.

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Background: The Endoscopic Healing Index (EHI) analyzes biomarkers in a patient's peripheral blood to assess mucosal healing. We aimed to characterize the effectiveness of the EHI as a predictor of disease activity in a real world clinical setting.

Methods: This retrospective study looked at patients treated and followed up at the University of Chicago Medicine IBD center who had EHI tests done as part of routine clinical care.

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Background And Aims: Several faecal microbial transplantation [FMT] approaches for ulcerative colitis [UC] have been investigated with conflicting results. We have recently published the clinical outcomes from the CRAFT UC Trial using FMT with the UC Exclusion Diet [UCED], compared with FMT alone. Here we aimed to compare the two FMT strategies in terms of microbial profile and function.

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Introduction: To better inform the risk of cuffitis in patients with ulcerative colitis (UC), we aimed to identify its occurrence and associated precolectomy factors in a large multicenter cohort of patients who underwent restorative proctocolectomy (RPC) with stapled ileal pouch-anal anastomosis (IPAA).

Methods: This study was a retrospective cohort analysis of individuals diagnosed with UC or indeterminate colitis who underwent RPC with IPAA for refractory disease or dysplasia at Mount Sinai Hospital or the University of Chicago followed by at least 1 pouchoscopy with report of the pouch-anal anastomosis. The primary outcome was cuffitis defined as ulceration of the cuff as reported in each pouchoscopy report.

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Article Synopsis
  • Postoperative recurrence (POR) is common in Crohn's disease patients after surgery, but can be reduced with preventive treatment; however, there is insufficient data on the best treatment options and timing.
  • A clinical study compared the effectiveness of early treatment with 6-mercaptopurine (6-MP) versus adalimumab in patients after ileocecectomy, finding that adalimumab significantly reduced endoscopic recurrence rates at both 32 and 58 weeks post-surgery.
  • Factors like increased size of the resected bowel, lower body mass index (BMI), and specific lab results were linked to a higher risk of endoscopic recurrence, indicating that adalimumab may be a more effective choice for
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Background: Ozanimod is a first-in-class Sphingosine-1-phosphate (S1P) receptor modulator approved for the treatment of moderately to severely active ulcerative colitis (UC). Real world data describing use of ozanimod are limited.

Aim: To provide 1-year follow-up results of our UC patient cohort treated with ozanimod.

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Introduction: Ozanimod regulates lymphocyte egress from the spleen and lymph nodes into the systemic circulation. The histological changes which occur in the lymph nodes of patients on ozanimod is unknown.

Materials And Methods: This retrospective study included patients with ulcerative colitis [UC] undergoing total colectomy for treatment-refractory disease who received ozanimod, and a cohort of patients with UC undergoing colectomy who did not have ozanimod exposure.

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The risk of urgent bowel resection increases significantly among patients hospitalized with acute severe ulcerative colitis. In-hospital management requires quick diagnostic, therapeutic, and decision-making, combined with a multi-disciplinary approach and accessibility to multiple therapeutic options. However, the optimal strategy is still debatable.

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Background & Aims: Upadacitinib is a novel selective Janus kinase 1 inhibitor that has shown efficacy in the treatment of moderate to severe ulcerative colitis (UC) and Crohn's disease (CD), and has received Food and Drug Administration approval for UC. We report a large real-world experience with upadacitinib in UC and CD.

Methods: We performed a prospective analysis of clinical outcomes on upadacitinib in patients with UC and CD using predetermined intervals at weeks 0, 2, 4, and 8 as part of a formalized treatment protocol at our institution.

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Background: Fecal calprotectin (Fcal) is a noninvasive, inexpensive biomarker of disease activity. However, patient compliance with this test is variable and incompletely described. We assessed compliance rates with Fcal tests and identified factors associated with noncompliance.

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Purpose: OAGB is the third most common bariatric surgery. Biliary reflux (BR) is an inherent complication of this unique anatomy, although there is still controversy regarding its significance and long-term risks including carcinogenesis. To date, there is no effective treatment for BR with conversion to RYGB reserved for refractory patients.

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Crohn's disease (CD) is a chronic immune-mediated inflammatory condition which can negatively impact a patient's quality of life. The traditional management strategy for CD has focused on symptomatic control, however, this approach fails to prevent organ damage and to change the progressive course of this disease. Thus, the field has moved towards a treat-to-target strategy that includes identifying individualized objective targets, choosing a therapy based on individual factors that include disease severity and risk, closely monitoring disease activity at predefined time points, and optimizing therapies as needed.

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The armamentarium of medical therapy for inflammatory bowel disease (IBD) has expanded significantly during the past decade. A major change has been the introduction of novel, orally targeted, small molecule therapies, which are promising alternatives to traditional biomolecular drugs. Sphingosine-1 phosphate (S1P) receptor-modulating therapies are the newest class of oral small molecules to be approved by the US Food and Drug Administration (FDA) for the treatment of ulcerative colitis (UC) and are currently being studied in Crohn's disease.

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Background: Recent real-world effectiveness studies investigating tofacitinib have been encouraging. Questions remain regarding the long-term effectiveness and safety of tofacitinib, effect on endoscopic remission rates, histologic changes, and alterations in fecal calprotectin levels.

Methods: This retrospective study includes consecutive patients with inflammatory bowel disease (IBD) who initiated tofacitinib therapy.

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Article Synopsis
  • - The study aimed to investigate changes in health resource usage, medications, and lab results in the years leading up to a diagnosis of inflammatory bowel disease (IBD) using data from Maccabi Health Services records.
  • - Out of 5,643 patients analyzed, significant laboratory changes occurred in the two years before diagnosis, with increased white blood cells and C-reactive protein, and decreased hemoglobin, while other parameters showed progressive decline starting five years before diagnosis.
  • - The findings suggest that tracking these changes could lead to the development of a composite score or referral system to help identify IBD earlier during primary care visits.
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This article reviews the latest data concerning the use of advanced therapeutic techniques for endoscopically treating colitis-associated neoplastic lesions and discusses factors associated with improved outcomes.

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Ozanimod has recently received US Food and Drug Administration approval for moderate-to-severe ulcerative colitis. Treatment of acute severe colitis remains a clinical challenge, and although many patients respond to cyclosporine therapy, there remains a relative paucity of maintenance options. This case report describes the first reported, successful use of ozanimod after hospitalization for acute severe ulcerative colitis and in tandem with cyclosporine.

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Background: Diagnosis of cytomegalovirus (CMV) colitis in the setting of severe ulcerative colitis (UC) remains a clinical challenge. This study aimed to determine the utility of serum CMV polymerase chain reaction (PCR) as a non-invasive test for the diagnosis of CMV superinfection in patients hospitalized with UC.

Methods: This retrospective study included consecutive admitted patients with UC who had serum testing for CMV completed as part of standard hospital procedure and CMV colitis diagnosed by expert pathologists.

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Acromioclavicular (AC) joint injuries occur with a traumatic load to the lateral aspect of the shoulder and account for 9% of all shoulder girdle injuries. Rockwood classified AC joint injuries as type I though type VI, based on severity of injury, radiographic findings, and reducibility of the AC joint. Type I and II injuries are typically managed nonoperatively, whereas type IV, V, and VI are managed operatively to address the significant soft tissue disruption, persistent AC joint instability, and apical shoulder deformation.

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Restorative proctocolectomy with ileal pouch-anal anastomosis is the surgical treatment of choice for patients with ulcerative colitis. Unfortunately, pouch inflammation (ie, pouchitis) is reported in up to 72% of pouch patients..

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Introduction: Treatment of ulcerative colitis (UC) now includes mucosal healing. Adoption of histologic end points is hindered by a lack of evidence guiding optimal sampling, interpretation, and reproducibility of results.

Methods: We analyzed biopsy fragments from colonoscopies in 92 patients with UC.

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