Breath-based stratification of asthma severity using the MISTRAL platform with integrated H2S sensor and clinical validation
Abstract
Exhaled breath analysis offers a painless window into airway inflammation, yet its clinical adoption is limited by a shortage of robust biomarkers. Hydrogen sulfide ([Formula: see text]) has been detected in biological fluids, but its diagnostic value across asthma severities is not well established. In this study, we integrated an electrochemical [Formula: see text] sensor with a detection limit of 1 ppb into the MISTRAL platform. We evaluated exhaled [Formula: see text] in a prospective cohort of 28 adult asthmatic patients. Mean exhaled [Formula: see text] concentrations were significantly higher in individuals with mild-to-moderate asthma ([Formula: see text]) than in those with severe asthma ([Formula: see text]; one‑tailed t‑test [Formula: see text], [Formula: see text]). In early-stage disease, [Formula: see text] levels negatively correlated with maximal expiratory flow MEF[Formula: see text], with a similar trend for MEF[Formula: see text], whereas in severe asthma, positive but not fully statistically significant correlations emerged with FEV[Formula: see text]/FVC ratio, and vital capacity VC. These findings reveal a biphasic pattern: elevated [Formula: see text] may signify a compensatory antioxidant response that collapses as damage in the medium-to-peripheral airways progresses. The plug-and-play MISTRAL platform thus enables real-time, point-of-care assessment of exhaled [Formula: see text] as a promising, and complementary biomarker to FeNO and blood…
How strong is the evidence?
Evidence Hub reads this as a cohort study, done in people. Its evidence level is 3 of 5 (Moderate · trial / cohort / secondary analysis). Trials without a large randomized design, cohorts and secondary analyses give moderate evidence. Reported size: 28 participants or records.
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