Ventilação não invasiva na capacidade funcional de cardiopatas com fração de ejeção ventricular normal

Abstract

Introduction: Heart failure (HF) is a public health problem with high morbidity levels and mortality, presenting fatigue and early dyspnea as clinical signs characteristic that generate functional limitations. Objective: To evaluate the noninvasive ventilation (NIV) effects in functional capacity of patients with stable heart failure with a normal ejection fraction, evaluated using six-minute treadmill walk (tread- 6MWT). Method: After pulmonary function tests evaluation, the patients with HF studied were submitted to the following tests: 3 tread6MWT (previous use of NIV for 30 minutes, use of NIV during the test and without use of NIV) and one test 6-minute test soil (6MWT). They compared the walking distance (WD) and cardiorespiratory variables: before, during and after the walking tests. Results: 13 patients with class II and III HF (NYHA) participated in the study. In the pulmonary function test, 3 participants presented restrictive ventilatory disorder and 8 patients had a reduction in maximum respiratory pressures. There was no statistically significant difference in distance between the four tests performed (p = 0.986). In the analysis of the cardiorespiratory variables during the 3 tread6MWT, only a significant statistical difference in the respiratory rate in the sixth minute (f6 ‘) between the tests 30’ before NIV X NIV during (p =0.026) was observed, being lower in the test with the application of NIV during the test. Conclusion: Despite the functional capacity impairment and lung function, patients with heart failure with normal ejection fraction studied did not increase the distance walked on the treadmill treadmill test with non-invasive ventilatory support.