Breath testing for intra-abdominal infection: appendicitis, a preliminary study.

Area of Science:

• Medical Diagnostics
• Analytical Chemistry
• Gastroenterology

Background:

• Intra-abdominal infections, such as acute appendicitis, require timely diagnosis.
• Current diagnostic methods can be invasive or have limitations.
• Breath analysis offers a non-invasive approach to detect biomarkers.

Purpose of the Study:

• To investigate the potential of breath analysis for recognizing intra-abdominal infection.
• To use acute appendicitis as a model condition for breath analysis diagnostics.
• To identify specific volatile compounds (VCs) in breath associated with acute appendicitis.

Main Methods:

• Pilot study involving 53 patients categorized into appendix, control, and normal groups.
• Breath samples analyzed using ion molecule reaction mass spectroscopy (IMRMS).
• Measurement of volatile compounds (VCs) with molecular masses 27-123.
• Collection and analysis of intraperitoneal gas samples from a subset of patients.

Main Results:

• Statistically significant differences in VC concentrations were observed between the three patient groups.
• Specific VCs including acetone, isopropanol, propanol, and butyric acid were identified.
• Principal component analysis differentiated control and appendicitis groups based on seven specific variables (m/z 56, 58, 59, 60, 61, 87, 88).
• Significant correlations were found between breath and intraperitoneal samples for acetone and VC m/z 61.

Conclusions:

• Breath analysis shows promise as a potential aid in diagnosing acute appendicitis.
• Further research is needed to account for factors like starvation and background VC levels.
• Larger studies correlating breath VCs with causative organisms are recommended to determine the significance of individual VCs.