Association of cardiovascular fibrosis, remodeling, and dysfunction with frailty, pre-frailty, and functional performance: the Multi-Ethnic Study of Atherosclerosis (MESA)

In: The journals of gerontology. Series A, Biological sciences, medical sciences

Abstract

Abstract

Background
Cardiovascular disease is associated with higher incidence of frailty. However, the nature of the mechanisms underlying this association remain unclear. The purpose of this study is to identify cardiovascular phenotypes most associated with physical frailty and functional performance in the Multi-Ethnic Study of Atherosclerosis (MESA).


Methods
As part of the MESA study, 3045 participants underwent cardiovascular magnetic resonance and computed tomography between 2010-2012. Of these, 1743 completed a Six-Minute Walk test (6MWT) and questionnaires (follow-up Exam: 2016-2018) which were used to generate a binary combined frail/prefrail vs. robust score according to a modified FRAIL Scale (self-report questionnaire). Multivariable logistic (binary frail outcome) or linear (6MWT) regression assessed the association between frailty and cardiovascular structure and function, aortic stiffness, coronary artery calcium, and myocardial fibrosis (ECV, extracellular volume fraction).


Results
Participants were 66±8yrs, 52% female at the time of imaging, and 29.4% were classified as frail or pre-frail. Older age and female gender were associated with greater odds of being in the frail/prefrail group. Concentric left ventricular remodeling (OR 1.89,p=0.008; Coef. -52.9,p<0.001), increased ECV (OR 1.10,p=0.002; Coef. -4.0,p=0.001), and worsening left atrial strain rate at early diastole (OR 1.56,p=<0.001; Coef. -22.75,p=0.027) were found to be associated with a greater likelihood of being in a frail state and lower 6MWT distance (m) . All associations with 6MWT performance were attenuated with adjustments for risk factors while ECV and LA strain rate remained independently associated with frailty.


Conclusions
These findings suggest a significant overlap in pathways associated with subclinical cardiac dysfunction, cardiovascular fibrosis and physical frailty.