Key result
PA acceleration time <100 ms is linked to ~20% higher all-cause mortality in older adults.
Why the study?
The prognostic significance of pulmonary artery acceleration time (PAAT) in community-dwelling older adults was not well known.
Is reduced echocardiographic pulmonary artery acceleration time (PAAT) associated with higher mortality risk in community-dwelling older adults?
Cohort (n=2,758)
Is reduced echocardiographic pulmonary artery acceleration time (PAAT) associated with higher mortality risk in community-dwelling older adults?
Reduced PAAT is associated with higher mortality risk in older adults, but this relationship is primarily driven by cardiovascular disease and systemic health rather than isolated pulmonary disease.
BACKGROUND: Pulmonary artery acceleration time (PAAT) is an echocardiographic measure associated with pulmonary artery pressure. Although reduced PAAT has been linked to pulmonary hypertension and adverse outcomes in selected patient populations, less is known about its prognostic significance in community-dwelling older adults, which was the focus of the present study. METHODS: Using baseline echocardiographic PAAT measurements, we categorized 2758 participants in the Cardiovascular Health Study into PAAT >130 ms (N = 758), 100-130 ms (N = 1089), and <100 ms (N = 911). Cox regression models were used to estimate associations with mortality (reference, PAAT >130 ms), and restricted cubic spline analyses were used to assess nonlinearity of the associations (reference, PAAT 130 ms), during a median follow-up of 13.4 years. RESULTS: All-cause mortality occurred in 75.2%, 82.9%, and 85.5% of participants with PAAT >130 ms, 100-130 ms, and <100 ms, respectively. Corresponding age-sex-race-adjusted HRs (95% CIs) were 1.00, 1.11 (0.99-1.23) and 1.20 (1.08-1.34). Associations were attenuated primarily by adjustment for World Health Organization Group 2 (cardiac) but not Group 3 (pulmonary) pulmonary hypertension physiology and by adjustment for subclinical biomarkers and were no longer significant in fully adjusted models. Associations and attenuations were stronger for cardiovascular mortality than non-cardiovascular mortality. Restricted cubic spline analyses demonstrated no significant nonlinearity in age-sex-race-adjusted HRs for total mortality, which increased progressively at PAAT values below 130 ms. CONCLUSIONS: Lower PAAT is associated with higher risks of death in community-dwelling older adults. The association appears to be explained largely by cardiovascular disease and systemic health status rather than pulmonary disease alone. PAAT may serve as an integrated marker of cardiopulmonary and systemic vulnerability in older adults.
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Nations et al. (2026) conducted a cohort in Mortality risk (n=2,758). Pulmonary artery acceleration time (PAAT) <100 ms vs. PAAT >130 ms was evaluated on All-cause mortality (HR 1.20, 95% CI 1.08-1.34). In community-dwelling older adults, a pulmonary artery acceleration time <100 ms was associated with increased all-cause mortality compared to >130 ms (85.5% vs 75.2%; HR 1.20; 95% CI 1.08-1.34).
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