Preserved left ventricular systolic and diastolic function in normoalbuminuric insulin-dependent diabetic patients with glomerular hyperfiltration.

This study was conducted to test the hypothesis that normotensive, normoalbuminuric IDDM patients with glomerular hyperfiltration may present functional or structural cardiac abnormalities. Eleven normoalbuminuric and normotensive IDDM patients with normal glomerular filtration rate and 11 patients with hyperfiltration were compared with a group of 17 age and sex matched controls. Glomerular filtration rate was measured by the 51Cr-EDTA technique and hyperfiltration was defined as a glomerular filtration rate higher than 134 ml/min/1.73 m2. Phonocardiogram, M-mode and pulsed Doppler two-dimensional echocardiograms were performed to evaluate resting left ventricular dimensions, systolic and diastolic function. Left ventricular dimensions, fractional shortening, mean velocity of fiber shortening, early and late diastolic peak filling velocity, deceleration time, mitral flow velocity integral, and isovolumic relaxation time were similar (ANOVA P > 0.05) in normal controls, diabetic patients with normal glomerular filtration rate, and diabetic patients with hyperfiltration. In conclusion, the results of our controlled observations indicate that normoalbuminuric and normotensive IDDM patients who have normal glomerular filtration rate or hyperfiltration have no Doppler-echocardiographic evidence of functional and structural abnormalities.