The prognostic significance and cut-off value of the VE/VCO2 slope for predicting heart failure events increased with advancing age (P<0.0001 for interaction).
Observational (n=1,501)
Does the prognostic significance and cut-off value of the VE/VCO2 slope vary according to age in patients with heart failure?
The prognostic significance and optimal cut-off value of the VE/VCO2 slope for predicting heart failure events increase with advancing age, suggesting age-specific thresholds should be considered in clinical practice.
p-value: p=<0.0001
Background Ventilatory efficiency decreases with age. This study aimed to investigate the prognostic significance and cut-off value of the minute ventilation/carbon dioxide production (VE/VCO 2 ) slope according to age in patients with heart failure. Methods and results We analysed 1501 patients with heart failure from our observational cohort who performed maximal symptom-limited cardiopulmonary exercise testing and separated them into three age groups (≤55 years, 56–70 years and ≥71 years) in total and according to the three ejection fraction categories defined by European Society of Cardiology guidelines. The endpoint was set as heart failure events, hospitalisation for heart failure or death from heart failure. The VE/VCO 2 slope increased with age. During the median follow-up period of 4 years, 141 heart failure (9%) events occurred. In total, univariate Cox analyses showed that the VE/VCO 2 slope (cont.) was significantly related to heart failure events, while on multivariate analysis, the prognostic significance of the VE/VCO 2 slope (cont.) was poor, accompanied by a significant interaction with age ( P < 0.0001). The cut-off value of the VE/VCO 2 slope increased with the increase in age in not only the total but also the sub-ejection fraction categories. Multivariate analyses with a stepwise method adjusted for estimated glomerular filtration rate, peak oxygen consumption, atrial fibrillation and brain natriuretic peptide, showed that the predictive value of the binary VE/VCO 2 slope separated by the cut-off value varied according to age. There was a tendency for the prognostic significance to increase with age irrespective of ejection fraction. Conclusion The prognostic significance and cut-off value of the VE/VCO 2 slope may increase with advancing age.
Kato et al. (Tue,) conducted a observational in heart failure (n=1,501). VE/VCO2 slope was evaluated on heart failure events, hospitalisation for heart failure or death from heart failure (p=<0.0001). The prognostic significance and cut-off value of the VE/VCO2 slope for predicting heart failure events increased with advancing age (P<0.0001 for interaction).
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