Is Hydrogen Breath Test with Lactulose Feasible for Measuring Gastrocecal Transit in Critically Ill Children? Pilot...

Area of Science:

• Pediatric Critical Care Medicine
• Gastroenterology
• Respiratory Physiology

Background:

• Gastrocecal transit time (GCTT) is a key indicator of gastrointestinal function.
• The lactulose-exhaled hydrogen (eH2) test is a non-invasive method to measure GCTT.
• Assessing GCTT in critically ill children, especially those on mechanical ventilation, presents unique challenges.

Purpose of the Study:

• To evaluate the feasibility of performing the lactulose-eH2 test in critically ill children.
• To determine if the test results correlate with clinical findings in this population.
• To adapt the eH2 collection method for mechanically ventilated pediatric patients.

Main Methods:

• A modified technique was developed to collect exhaled hydrogen from ventilator tubing.
• The lactulose-eH2 test was attempted in critically ill children admitted to the Pediatric Intensive Care Unit (PICU).
• Patients with pre-existing gastrointestinal conditions were excluded from the study.

Main Results:

• The lactulose-eH2 test was successfully performed in 11 out of 11 mechanically ventilated patients, but not in spontaneously breathing patients.
• A significant proportion of patients (63.3%) did not exhibit an eH2 peak.
• In patients with an eH2 peak, the median GCTT was 130 minutes; however, no significant correlation with earlier intestinal movements was observed.

Conclusions:

• The adapted method for collecting exhaled hydrogen is useful for critically ill children on mechanical ventilation.
• The lactulose-eH2 test may not be a reliable tool for measuring GCTT in critically ill pediatric patients due to inconsistent results.
• Further research is needed to refine GCTT measurement techniques in this vulnerable population.