Publications by authors named "John Nasr"

Background And Study Aims: EUS-guided gallbladder drainage (EUS-GBD) using lumen apposing metal stents (LAMS) has excellent technical and short-term clinical success for acute cholecystitis (AC). The goals of this study were to determine the long-term clinical outcomes and adverse events (AEs) of EUS-GBD with LAMS.

Patients And Methods: A multicenter, retrospective study was conducted at 18 US tertiary care institutions.

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Endoscopic ultrasound-directed transgastric ERCP (EDGE) is a safe and efficacious procedure to treat pancreaticobiliary diseases in Roux-en-Y gastric bypass (RYGB). This multicenter study aimed to determine the long-term outcomes of EDGE focusing on fistula persistence rates and post-procedure weight change. Information about patients with Roux-en-Y gastric bypass anatomy who underwent EDGE between 2015 and 2021 from 10 institutions was captured in a registry.

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Article Synopsis
  • The study developed a new DNA/RNA next-generation sequencing platform called PancreaSeq Genomic Classifier to enhance the evaluation of pancreatic cysts, particularly in identifying cystic precursor neoplasms and advanced neoplasia.
  • This platform features a 74-gene targeted NGS panel that assesses various genomic alterations, and it was validated in separate cohorts, demonstrating high sensitivity and specificity for diagnosing pancreatic conditions.
  • The results show that PancreaSeq significantly increased the sensitivity of traditional pancreatic cyst guidelines by over 10% while maintaining high specificity, indicating its potential to improve clinical decision-making.
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Article Synopsis
  • Cholecystectomy (CCY) is the preferred treatment for acute cholecystitis (AC), with alternative nonsurgical options being EUS-guided and PT-guided gallbladder drainage.
  • A study compared outcomes of patients undergoing CCY after EUS-GBD vs PT-GBD, looking at demographics, procedure outcomes, and surgical details across 139 patients.
  • Results indicated that EUS-GBD led to faster surgical times, quicker symptom resolution, and shorter hospital stays than PT-GBD, while both methods had similar rates of converting to open surgery.
  • EUS-GBD is a viable option for gallbladder drainage and does not hinder follow-up CCY.
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Article Synopsis
  • This study aimed to prospectively evaluate the effectiveness of next-generation sequencing (NGS) on pancreatic cyst fluid in a multi-institutional setting, as previous research had mainly been retrospective or focused on single hospitals.
  • In total, 1933 pancreatic cyst specimens were tested, with 98% being satisfactory for NGS analysis, and findings were correlated with current guidelines and surgical outcomes.
  • Results indicated that mutations such as GNAS had high sensitivity and specificity for diagnosing mucinous cysts and that combining genomic alterations with cytopathologic evaluation significantly improved diagnostic accuracy compared to existing guidelines.
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Tumor-induced osteomalacia is a rare and often misdiagnosed condition that presents with progressively worsening unexplained chronic pain and proximal muscle weakness. The osteomalacia leads to multiple stress fractures which do not heal properly, leading to progressive disability. It is caused by chronic hypophosphatemia due to inappropriate urinary phosphate wasting.

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Background And Aims: Persistent gastrogastric or jejunogastric fistula is theoretically a concerning sequela of EUS-directed transgastric ERCP/EUS (EDGE), as it may functionally reverse the malabsorptive mechanism of Roux-en-Y gastric bypass (RYGB). Prior EDGE studies, using predominantly 15-mm (diameter) lumen-apposing metal stents (LAMS) and fistula closure by primary intent, collectively report 9% persistent fistula rate, without a clear weight gain association. Our study determines the incidence of persistent fistula, and its association with unintentional weight gain, among recipients of EDGE via 20-mm LAMS followed by spontaneous fistula closure (secondary intent).

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Video 1Video depicts EUS-guided choledochoduodenostomy creation using a biliary fully covered self-expanding metal stent after maldeployment of a lumen-apposing metal stent.

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Introduction: Treatment of pancreaticobiliary pathology following Roux-en-Y gastric bypass (RYGB) poses significant technical challenges. Laparoscopic-assisted endoscopic retrograde cholangiopancreatography (LA-ERCP) can overcome those anatomical hurdles, allowing access to the papilla. Our aims were to analyze our 12-year institutional outcomes and determine the learning curve for LA-ERCP.

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Background: Endoscopic ultrasound-directed transgastric endoscopic retrograde cholangiopancreatography (ERCP; EDGE) is an alternative to enteroscopy- and laparoscopy-assisted ERCP in patients with Roux-en-Y gastric bypass anatomy. Although short-term results are promising, the long-term outcomes are not known. The aims of this study were: (1) to determine the rates of long-term adverse events after EDGE, with a focus on rates of persistent gastrogastric or jejunogastric fistula; (2) to identify predictors of persistent fistula; (3) to assess the outcomes of endoscopic closure when persistent fistula is encountered.

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Background And Aims: EUS-directed transgastric ERCP (EDGE) is an endoscopic modality for treating pancreaticobiliary disorders after Roux-en-Y gastric bypass. EDGE consists of EUS-directed gastrogastrostomy/jejunogastrostomy creation (EUS-GG; step 1), followed by transgastric ERCP (step 2). The two steps can be performed in the same or separate endoscopic session(s).

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Background And Aims: Anterograde endoscopic ultrasound-guided pancreatic duct drainage (EUS-PDD) refers to transmural drainage of the main pancreatic duct via an endoprosthesis passed anterograde through the gastric (or intestinal) wall. Anterograde EUS-PDD is a rescue procedure for recalcitrant cases of benign obstructive pancreatopathy.

Methods: We conducted a dual-center retrospective chart review of 28 patients (mean age, 59 years; 50% female) who underwent attempted anterograde EUS-PDD between April 2016 and September 2019 for chronic pancreatitis (CP) (93%) or pancreaticojejunostomy stenosis (PJS) after Whipple resection (7%).

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Background: One of the most feared complications of endoscopic retrograde cholangiopancreatography (ERCP), with an incidence of 3.5 to 15%, is post ERCP pancreatitis (PEP). Given the role of statins in the reduction of systemic and pancreatic intraluminal inflammation, we hypothesized that the use of statins may lower the risk of PEP.

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While drug-induced pancreatitis from corticosteroids has been well described in the medical literature, the exact mechanism is unclear. We present the first reported case of drug-induced pancreatitis from beta-sitosterol, a naturally occurring plant sterol structurally similar to cholesterol, obtained primarily through Western diet and supplementation. A 57-year-old male with a history of situs inversus and benign prostatic hyperplasia presented from an outside facility with a two-day history of worsening epigastric pain radiating to the right upper quadrant.

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Backgrounds: Endoscopic ultrasound (EUS)-guided placement of lumen-apposing metal stents (LAMSs) has gained popularity for the treatment of pancreatic walled-off necrosis (WON). We compared the 20-mm and 15-mm LAMSs for the treatment of symptomatic WON in terms of clinical success and adverse events.

Methods: We conducted a retrospective, case-matched study of 306 adults at 22 tertiary centers from 04/2014 to 10/2018.

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Background And Aims: Enteroscopy-assisted ERCP is challenging in patients with surgically altered upper GI anatomy. This study evaluated a novel procedure, EUS-directed transenteric ERCP (EDEE), in the de novo creation of an enteroenteric anastomosis for the performance of ERCP in non-Roux-en Y gastric bypass (RYGB) patients.

Methods: This was a multicenter retrospective study involving 7 centers between January 2014 and October 2018.

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Article Synopsis
  • The study explores the use of EUS-directed transgastric intervention (EDGI) for diagnosing and treating problems in the duodenum and excluded stomach of Roux-en-Y gastric bypass patients.
  • The research involved 14 patients, achieving 100% technical and clinical success rates with the most common procedures being diagnostic EUS and endoscopic biopsies.
  • While there were two moderate adverse events related to stent placement, these issues were successfully managed, indicating that various gastrointestinal disorders can be effectively handled using EDGI.
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Cirrhosis has historically been considered a relative, if not absolute, contraindication to cholecystectomy. Endoscopic ultrasound-guided gallbladder drainage (EUS-GBD) has been developed for use in non-operative candidates with cholecystitis; however, little data exist for use of the procedure in patients with cirrhosis. This was a retrospective series involving two large tertiary referral centers performing EUS-GBD.

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