Minute ventilation in cardiorespiratory exercise and its relationship with ventricular ejection fraction

Abstract

Introduction: Cardiorespiratory exercise testing is a non-invasive alternative in the assessment of subjects with heart failure. Objective: To evaluate the validity of ventilatory equivalents for carbon dioxide (VE/VCO2) as a predictor of left ventricular ejection fraction (LVEF) compared to peak oxygen consumption. Methods: Cross-sectional analytical study in patients undergoing cardiopulmonary exercise testing and transthoracic echocardiography. The study was divided into a group with reduced LVEF < 40% and preserved ≥ 40%. Bivariate analysis comparing qualitative variables with the chi-square test and quantitative variables with Student's t-test was performed. A Receiver Operating Characteristic (ROC) curve was constructed to evaluate the discriminatory capacity between ventilatory equivalent for carbon dioxide and peak oxygen pulse. Results: The final analysis included 138 patients. In patients with reduced LVEF, peak oxygen consumption averaged 1.6 L/min (SD ± 0.68) compared to 1.7 L/min (SD ± 0.66) in the control group (p= 0.513). VE/VCO2 during ventilatory threshold and peak exercise averaged 38.4 (SD ± 7.38) and 44.6 (SD ± 8.24), respectively. The discriminatory performance of VE/VCO2 versus peak oxygen consumption was 0.737 (95% CI: 0.596-0.878; p= 0.008) in patients with reduced LVEF. Conclusions: VE/VCO2 is a reliable predictor of normal or reduced LVEF and performs well compared to peak oxygen consumption. © 2024, Editorial Ciencias Medicas. All rights reserved.