Pulmonary diffusion abnormalities in patients with inflammatory bowel disease: A longitudinal study

Area of Science:

• Pulmonary Medicine
• Gastroenterology
• Chronic Disease Management

Background:

• Impaired diffusing capacity of the lung for carbon monoxide (DLCO) is noted in inflammatory bowel diseases (IBD).
• Longitudinal data on DLCO impairment and its relation to IBD activity are lacking.
• Respiratory symptoms are common in IBD patients.

Purpose of the Study:

• To determine the prevalence of chronic DLCO impairment in IBD patients with respiratory symptoms.
• To describe the clinical characteristics of these patients.
• To explore the association between DLCO impairment and IBD activity over time.

Main Methods:

• Prospective, single-center study of IBD patients with respiratory symptoms.
• Longitudinal evaluation including pulmonary function tests and chest CT scans.
• Follow-up duration of approximately 27 months.

Main Results:

• 16.0% (12/75) of patients exhibited persistent DLCO reduction.
• Median DLCO was 63.4% of the predicted value.
• Patients had mild/inactive IBD, were on biologics, and had mild imaging abnormalities that didn't explain DLCO reduction.

Conclusions:

• Chronic DLCO impairment affects a significant minority of symptomatic IBD patients.
• No clear association was found between chronic DLCO impairment and clinically active IBD in this cohort.
• Further research is needed to understand the mechanisms and implications of DLCO impairment in IBD.