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Gastrointestinal Transit Time Assessed Using a CT-Based Radiopaque Marker Method in Patients With Acute Pancreatitis

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Summary

This study found a CT-based method feasible for assessing gastrointestinal transit in acute pancreatitis (AP). Methylnaltrexone did not improve transit but reduced laxative use compared to placebo.

Keywords:
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Area of Science:

  • Gastroenterology
  • Radiology
  • Clinical Trials

Background:

  • Gastrointestinal dysmotility is a common complication in acute pancreatitis (AP).
  • Assessing dysmotility often involves radiopaque markers and imaging techniques.
  • A novel, simple CT-based approach was developed for hospitalized AP patients.

Purpose of the Study:

  • To evaluate the feasibility of a CT-based method for measuring gastrointestinal transit in acute pancreatitis.
  • To assess the effect of methylnaltrexone on gastrointestinal transit and colonic dimensions in AP patients.
  • To compare the need for laxative treatment between methylnaltrexone and placebo groups.

Main Methods:

  • Secondary analysis of a randomized controlled trial involving 47 hospitalized AP patients with systemic inflammatory response syndrome.
  • Patients received either intravenous methylnaltrexone or placebo for 5 days.
  • Gastrointestinal transit was calculated using radiopaque markers visualized on CT scans on Day 5, alongside colonic dimension measurements.

Main Results:

  • Methylnaltrexone group required less frequent laxative treatment (57% vs. 88%, p=0.01).
  • No significant differences were observed in gastrointestinal transit times, marker retention scores, or colonic dimensions between methylnaltrexone and placebo groups.
  • Transit times, marker retention, and colonic dimensions were negatively correlated with self-reported stool frequency.

Conclusions:

  • The CT-based method for evaluating gastrointestinal transit in acute pancreatitis is feasible.
  • Methylnaltrexone did not demonstrate a significant effect on gastrointestinal transit compared to placebo in this AP cohort.
  • A notable finding was the reduced need for laxative therapy in patients treated with methylnaltrexone.