Background
Individuals with diabetes mellitus and pre-diabetes are at particularly high risk of incident heart failure or death, even after accounting for known confounders. Nevertheless, the extent of impairments in cardiac structure and function in elderly individuals with diabetes and pre-diabetes is not well known. We aimed to assess the relationship between echocardiographic measures of cardiac structure and function and dysglycemia
Methods and Results
We assessed measures of cardiac structure and function in 4419 participants without prevalent coronary heart disease or heart failure who attended the ARIC Visit 5 examination (2011-2013) and underwent transthoracic echocardiography (age 75±6 years; 61% female, 23% African-American). Subjects were grouped across the dysglycemia spectrum as normal (39%), pre-diabetes (31%), or diabetes (30%) based on medical history, antidiabetic medication use, and HbA1c levels. Glycemic status was related to measures of cardiac structure and function. Worsening dysglycemia was associated with increased LV mass, worse diastolic function, and subtle reduction in left ventricular systolic function (p ≤ 0.01 for all). For every 1% higher HbA1c, LV mass was higher by 3.0 grams (95% CI: 1.5-4.6 grams), E/E’ by 0.5 (95% CI: 0.4-0.7), and global longitudinal strain by 0.3% (95% CI: 0.2-0.4) in multivariable analyses.
Conclusions
In a large contemporary bi-racial cohort of elderly subjects without prevalent cardiovascular disease or heart failure, dysglycemia was associated with subtle and subclinical alterations of cardiac structure, and left ventricular systolic and diastolic function. It remains unclear whether these are sufficient to explain the heightened risk of heart failure in individuals with diabetes.