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Circulating endothelin-1 levels in type 2 diabetic patients with ischaemic heart disease

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Abstract

To investigate whether circulating endothelin-1 (Et-1) may be related to the increased incidence and severity of ischaemic heart disease in type 2 diabetes mellitus, we compared the concentrations in type 2 diabetic patients and in non-diabetic patients with coronary artery disease (CAD) angiographically documented. Plasma levels of Et-1 were determined in 34 type 2 diabetic patients with CAD (16 with stable angina, 6 with unstable angina, 12 with previous myocardial infarction) and in 19 non-diabetic patients with CAD (4 with stable angina, 5 with unstable angina, 10 with previous myocardial infarction). Fifteen diabetic patients without CAD and 9 healthy volunteers served as control subjects. In the type 2 diabetic patients, the mean Et-1 levels were 3.19±1.61 pmol/l in those with stable angina, 3.58±1.92 pmol/l in those with unstable angina, 4.24±2.53 pmol/l in those with myocardial infarction. These values were not significantly different one another, nor from the values obtained from type 2 diabetic controls (3.64±2.13 pmol/l). In the non-diabetic patients, the mean Et-1 levels were 3.92±0.73 pmol/l in those with stable angina, 4.35±1.67 pmol/l in those with unstable angina, 4.33±1.66 pmol/l in those with myocardial infarction. These values were not significantly different one another, but significantly higher than those obtained from healthy controls (2.07±0.67 pmol/l;P<0.001). No significant differences were found in Et-1 levels between diabetic and non-diabetic patients with stable, unstable angina and previous myocardial infarction. In contrast, a statistically significant difference was found in Et-1 levels between diabetic and non-diabetic control subjects (P<0.05). In conclusion, similar raised concentrations of Et-1 in diabetic and non-diabetic patients with stable, unstable angina and previous myocardial infarction do not support the hypothesis that higher levels of Et-1 in diabetic patients are responsible for the increased incidence of CAD in diabetes mellitus. However, the raised Et-1 levels found in diabetic patients in the absence of CAD strongly suggest that a generalised endothelial dysfunction, documented in our study by increased levels of Et-1, most probably precedes subsequent cardiovascular diseases.

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Donatelli, M., Hoffmann, E., Colletti, I. et al. Circulating endothelin-1 levels in type 2 diabetic patients with ischaemic heart disease. Acta Diabetol 33, 246–248 (1996). https://doi.org/10.1007/BF02048552

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  • DOI: https://doi.org/10.1007/BF02048552

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