Insulin Resistance Is Associated with Right Ventricular Dysfunction.

The effect of insulin resistance on left ventricular function is well documented; however, less is known regarding its effect on the right ventricle (RV). To evaluate the association between insulin resistance and RV function by echocardiography in a cohort of adults without baseline cardiovascular disease. We performed a retrospective cohort study in the MESA (Multi-Ethnic Study of Atherosclerosis). Linear regression was used to examine the association between overall insulin resistance measured by the mean triglyceride (TG) to high-density lipoprotein (HDL) cholesterol ratio (TG:HDL) and change in TG:HDL over time for each participant with echocardiographic RV function. Logistic regression was used to calculate the odds ratios (ORs) of RV systolic and diastolic dysfunction. Among 3,032 participants, higher mean TG:HDL was associated with lower (worse) absolute RV longitudinal strain (β, -0.38; 95% confidence interval [CI], -0.64 to -0.13;  < 0.01), tricuspid annular plane systolic excursion (β, -0.05; 95% CI, -0.07 to -0.04;  < 0.001), and higher odds of abnormal RV strain (OR, 1.26; 95% CI, 1.08 to 1.47;  < 0.01) and abnormal tricuspid annular plane systolic excursion (OR, 1.31; 95% CI, 1.14 to 1.51;  < 0.001). TG:HDL was also associated with lower ratio of tricuspid early to late ventricular filling velocities (E/A) (β, -0.03; 95% CI, -0.04 to -0.01;  < 0.01), higher ratio of early diastolic tricuspid inflow to tricuspid lateral annular velocity (E/e') (β, 0.15; 95% CI, 0.07 to 0.23;  < 0.001), and higher odds of graded RV diastolic dysfunction (OR, 1.19; 95% CI, 1.03 to 1.39;  < 0.05). These associations remained following multivariable adjustment. Insulin resistance was associated with decreased RV systolic and diastolic function after adjusting for alternative causes of RV dysfunction, suggesting that insulin-resistant individuals are at risk for early RV dysfunction, even in the absence of cardiovascular disease.