Factors contributing to left ventricular diastolic dysfunction in long-term type I diabetic subjects

Area of Science:

• Cardiology
• Diabetology
• Medical Imaging

Background:

• Type 1 diabetes is associated with left ventricular (LV) diastolic dysfunction.
• The specific impact of mild or borderline hypertension on these diastolic changes in diabetics remains unclear.

Purpose of the Study:

• To investigate the contribution of systolic blood pressure and left ventricular mass to subclinical diastolic dysfunction in type 1 diabetic patients.
• To determine if mild hypertension exacerbates cardiac abnormalities in long-term type 1 diabetics.

Main Methods:

• Digitized M-mode echocardiograms were analyzed in 32 type 1 diabetic subjects and 32 age-matched normotensive controls.
• Blood pressure, heart rate, and echocardiographic parameters including LV dimensions, wall thickness, mass index, and filling rates were assessed.
• Multivariate analysis was employed to identify independent predictors of diastolic dysfunction.

Main Results:

• Diabetic subjects exhibited higher heart rates and blood pressures than controls.
• Despite similar LV mass index and fractional shortening, diabetics showed a decreased normalized peak filling rate and an increased rapid filling period fraction of diastole.
• Multivariate analysis revealed that diabetes, LV mass, and systolic blood pressure were independent contributors to diastolic abnormalities.

Conclusions:

• This study identifies systolic blood pressure and LV mass as independent factors contributing to subclinical diastolic dysfunction in type 1 diabetes.
• The findings suggest that managing even mild hypertension may be crucial in preventing diabetic cardiomyopathy.
• Early intervention for hypertension in diabetics could help delay the progression of cardiac complications.