The utility of cardiac rehabilitation in improving endothelium-dependent vascular function in very elderly patients

Abstract Background Endothelial function is crucial for cardiovascular health and diseases. Cardiac rehabilitation has been reported to be useful in enhancing physical performance, quality of life, and endothelial function. The aging of patients with cardiovascular diseases is further progressing, and it is unclear whether cardiac rehabilitation improves physical function and endothelial function in very elderly patients with cardiovascular diseases. Purpose The purpose of this study is to investigate whether outpatient cardiac rehabilitation for individuals aged 80 and above improves physical function, quality of life (QOL), and vascular endothelial function. Methods Forty nine patients aged over 80 years with cardiovascular diseases participated in an outpatient cardiac rehabilitation program. Cardiac rehabilitation was conducted for 1 hour per session, 1-2 times per week for 3-4 months. Cardiopulmonary exercise testing (CPX) was conducted for the evaluation of physical function. QOL was assessed with Kansas City Cardiomyopathy Questionnaire (KCCQ) scores. The reactive hyperemia index (RHI) was measured using EndoPAT2000 in each patient to assess endothelial function. An RHI ≤ 1.67 was defined as endothelial dysfunction. Results The mean ± standard deviation of age was 84 ± 4 years, with 16 (33%) being male. Peak oxygen uptake improved significantly (from 14.1 ± 4.0 to 15.4 ± 3.9 mL/kg/min, P=0.002), as did short physical performance battery scores (from 10.1 ± 2.7 to 10.7 ± 2.0, P=0.004), mini-mental state examination scores (from 27.7 ± 2.2 to 28.2 ± 2.0, P=0.004), Japanese version of the Cardiovascular Health Study criteria (from 2.3 ± 1.3 to 1.5 ± 1.2, P<0.0001), and KCCQ scores (from 76.8 ± 18.4 to 81.4 ± 20.4, P=0.02) after the cardiac rehabilitation program. Endothelial function also improved (LogRHI 0.48 ± 0.39 to 0.57 ± 0.30, P=0.027), and the prevalence of endothelial dysfunction decreased from 54% to 36% after the cardiac rehabilitation program. Conclusion Even in the very elderly patients, outpatient cardiac rehabilitation is beneficial for improving physical function, quality of life, and endothelial function.