Although diabetes mellitus is well known to result in systolic and diastolic left ventricular (LV) dysfunction at the subclinical level, even when it is not accompanied by hypertension and coronary artery disease, this situation has not been sufficiently investigated in prediabetes, which is the precursor of diabetes. The aims of the present study were to investigate LV systolic and diastolic function in normotensive and low-risk prediabetic and diabetic subjects for coronary disease using sensitive tissue Doppler echocardiographic parameters, to investigate early possible negative effects of glucose metabolism impairment on LV longitudinal function.Methods
Two hundred subjects (92 with prediabetes, 48 with type 2 diabetes, and 60 age-matched healthy volunteers) were studied by conventional, tissue Doppler, and strain and strain rate echocardiography. All study subjects were normotensive, and coronary artery disease was excluded. Forty-eight patients had isolated fasting glucose impairment, and 44 patients had combined fasting glucose and glucose tolerance impairment. Longitudinal peak systolic strain and the peak systolic and diastolic strain rates of six walls in the apical four-chamber, long-axis, and two-chamber views were evaluated.Results
Clinical and standard echocardiographic characteristics were comparable among all groups. Mean systolic (P = .01) and diastolic (P = .02) tissue velocities, mean strain (P = .004), and mean systolic (P = .002) and diastolic (P = .001) strain rates were significantly lower in the diabetic groups than in control subjects. There were no difference between patients with isolated fasting glucose impairment and controls for tissue Doppler parameters, but mean early diastolic tissue velocity and mean strain and strain rates were statistically lower in patients with combined fasting glucose and glucose tolerance impairment compared with controls (P < .05).Conclusions
LV longitudinal systolic and diastolic function was impaired in both normotensive diabetic and prediabetic patients.