Proportional assist ventilation improves leg muscle reoxygenation after exercise in heart failure with reduced ejection fraction

• Main Author: Silva, Audrey Borghi
• Publication Date: 2021
• Other Authors: Goulart, Cássia da Luz, Carrascosa, Cláudia R., Oliveira, Cristino Carneiro, Berton, Danilo Cortozi, Almeida, Dirceu Rodrigues de, Nery, Luiz Eduardo, Arena, Ross, Neder, José Alberto
• Format: Dataset
• Language: eng
• Source: Repositório Institucional da UFSCAR
• Download full: https://doi.org/10.3389/fphys.2021.685274; https://repositorio.ufscar.br/handle/20.500.14289/15603
• topic: Blood flow; Heart failure; Non-invasive ventilation; Hemodynamics; Exercise recovery; CIENCIAS DA SAUDE::FISIOTERAPIA E TERAPIA OCUPACIONAL

Background: Respiratory muscle unloading through proportional assist ventilation (PAV) may enhance leg oxygen delivery, thereby speeding off-exercise oxygen uptake (V.O2) kinetics in patients with heart failure with reduced left ventricular ejection fraction (HFrEF). Methods: Ten male patients (HFrEF = 26 ± 9%, age 50 ± 13 years, and body mass index 25 ± 3 kg m2) underwent two constant work rate tests at 80% peak of maximal cardiopulmonary exercise test to tolerance under PAV and sham ventilation. Post-exercise kinetics of V.O2, vastus lateralis deoxyhemoglobin ([deoxy-Hb + Mb]) by near-infrared spectroscopy, and cardiac output (QT) by impedance cardiography were assessed. Results: PAV prolonged exercise tolerance compared with sham (587 ± 390 s vs. 444 ± 296 s, respectively; p = 0.01). PAV significantly accelerated V.O2 recovery (τ = 56 ± 22 s vs. 77 ± 42 s; p < 0.05), being associated with a faster decline in Δ[deoxy-Hb + Mb] and QT compared with sham (τ = 31 ± 19 s vs. 42 ± 22 s and 39 ± 22 s vs. 78 ± 46 s, p < 0.05). Faster off-exercise decrease in QT with PAV was related to longer exercise duration (r = −0.76; p < 0.05). Conclusion: PAV accelerates the recovery of central hemodynamics and muscle oxygenation in HFrEF. These beneficial effects might prove useful to improve the tolerance to repeated exercise during cardiac rehabilitation.