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Insulin resistance and beta-cell hypersecretion in essential hypertension
L A Sechi1, R Tedde, A Marigliano
1Hypertension Unit, Istituto di Clinica Medica Generale, University of Sassari, Italy.
Summary
Essential hypertension and overweight conditions are linked to insulin resistance. This study found that overweight and hypertensive individuals exhibit higher insulin and C-peptide levels, suggesting impaired insulin action.
Area of Science:
- Endocrinology
- Cardiovascular Medicine
- Metabolic Syndrome
Background:
- Essential hypertension is a prevalent cardiovascular condition.
- Insulin resistance is implicated in various metabolic disorders.
- The role of insulin sensitivity in hypertension pathogenesis requires further elucidation.
Purpose of the Study:
- To investigate the association between insulin sensitivity and essential hypertension.
- To compare insulin levels and glucose metabolism markers in normotensive and hypertensive subjects with varying body weights.
Main Methods:
- Cross-sectional study involving lean normotensives, overweight normotensives, lean hypertensives, and overweight hypertensives.
- Measurement of fasting blood glucose, serum insulin, and serum C-peptide.
- Calculation of glucose:insulin and insulin:C-peptide ratios.
Main Results:
- Overweight and hypertensive subjects displayed elevated fasting serum insulin and C-peptide levels.
- A lower glucose:insulin ratio was observed in overweight and hypertensive individuals.
- Diastolic blood pressure correlated positively with serum insulin and C-peptide, and inversely with the glucose:insulin ratio.
Conclusions:
- Insulin resistance is a common feature in both essential hypertension and overweight conditions.
- Hyperinsulinemia in essential hypertension may result from beta-cell over-secretion compensating for peripheral insulin resistance.
- Hepatic insulin clearance remains normal in hypertensive individuals, indicating a peripheral defect in insulin action.