[Clinical evaluation of the cause of left ventricular dysfunction in type 2 diabetes without significant cardiac disease].

OBJECTIVES

The relationship between left ventricular dysfunction and hypertension or proteinuria was evaluated in type 2 diabetic patients without significant cardiac disease to investigate the cause of diabetic cardiac dysfunction.

METHODS

Twenty-one patients with type 2 diabetes mellitus (mean age 63.8 +/- 7.4 years) underwent left ventriculography and Doppler echocardiography to calculate the ejection fraction and E/A ratio (E/A).

RESULTS

Thirteen patients had hypertension (61.9%) and six patients had proteinuria (28.6%). The E/A was 0.82 +/- 0.21 in all patients. The E/A in patients with hypertension or proteinuria was significantly less than in those without these diseases (0.74 +/- 0.18 vs 0.97 +/- 0.18, p = 0.011; 0.65 +/- 0.10 vs 0.89 +/- 0.20, p = 0.010, respectively). The ejection fraction was 73.3 +/- 7.2% in all patients. The ejection fraction in patients with proteinuria was significantly less than in those without proteinuria (67.6 +/- 10.0% vs 75.5 +/- 4.4%, p = 0.019), but there was no significant difference in ejection fraction between patients with and without hypertension. The duration of diabetes was significantly related to the ejection fraction (r = -0.436, p = 0.048) but not to the E/A.

CONCLUSIONS

In patients with type 2 diabetes without significant cardiac disease, left ventricular diastolic function may be related to both hypertension and proteinuria and left ventricular systolic function may be related to proteinuria and duration of diabetes. Therefore, in addition to hypertension, complications of nephropathy or long duration of diabetes may be related to the cause of the diabetic cardiac dysfunction.