Impact of Cardiovascular Comorbidities on Clinical Outcomes Across the Asthma Spectrum.

Background

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Objective

Cardiovascular disease (CVD) is a prevalent comorbidity in asthma, yet its impact on clinical outcomes across disease states remains poorly characterised.

Methods

We analysed data from two independent prospective cohorts. Cohort I comprised 1058 stable asthma patients (CVD: n = 107; non-CVD: n = 951) followed for 12 months to assess asthma exacerbations. Cohort II comprised 825 patients hospitalised for an acute exacerbation (CVD: n = 233; non-CVD: n = 592). Missing data were handled by multiple imputation, and the CVD and non-CVD groups were balanced using propensity score overlap weighting. Associations were estimated using negative binomial, gamma, and logistic regression. Mediation and dominance analyses were performed as exploratory analyses.

Results

Patients with CVD exhibited greater airflow obstruction and a predominantly non-T2 inflammatory profile characterised by increased neutrophilic inflammation. White blood cells, neutrophils, and monocytes partially mediated the association between CVD and lower FEV1/FVC ratio, while monocytes additionally mediated the association between CVD and severe exacerbations. In Cohort I, CVD was independently associated with severe exacerbations (adjusted IRR = 1.96, 95% CI (1.12, 3.44)), hospitalisations, and emergency visits. In Cohort II, CVD was associated with longer hospital stay (adjusted IRR = 1.14, 95% CI (1.01, 1.30)) and higher direct costs, with stroke and coronary heart disease as leading contributors to prolonged stay.

Conclusion

CVD is independently associated with worse clinical outcomes across the asthma disease spectrum. These findings support recognition of CVD as an important treatable trait in asthma and highlight the need for integrated cardiopulmonary management.