Measurement of Microvascular Function in Pediatric Inflammatory Bowel Disease

Area of Science:

• Vascular Biology
• Pediatric Gastroenterology
• Inflammatory Bowel Disease Research

Background:

• Altered vascular flow is implicated in inflammatory bowel disease (IBD) pathogenesis and severity.
• Microvascular dysfunction, characterized by impaired vasodilation, may signal generalized vascular disease (VD).
• Thromboembolic complications are recognized in IBD, but their origins remain unclear.

Purpose of the Study:

• To assess microvascular responsiveness in pediatric subjects with IBD.
• To evaluate postocclusion peripheral arterial pulsatile volume changes as an indicator of vascular function.
• To determine if microvascular dysfunction is present in pediatric IBD patients in clinical remission.

Main Methods:

• A cohort of 32 pediatric subjects (16 with IBD, 16 controls) was studied.
• Vascular reactivity was measured noninvasively using plethysmography (EndoPAT2000).
• The reactive hyperemia index (RHI) was calculated to quantify microvascular response post-occlusion.

Main Results:

• Patients with IBD had a significantly lower mean RHI compared to controls (1.66 vs. 2.02).
• The mean RHI in the IBD group fell within the adult range associated with VD risk (≤1.67).
• Baseline characteristics were similar between IBD and control groups, with all IBD patients in clinical remission.

Conclusions:

• Noninvasive plethysmography is a safe method to assess microvascular function in pediatric IBD.
• Pediatric IBD patients in remission exhibit an attenuated microvascular hyperemic response.
• Children with IBD and an RHI in the "at risk" range warrant monitoring for thromboembolic phenomena.