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Impaired insulin action in primary hyperaldosteronism.
J Widimský1, G Sindelka, T Haas
1Third Internal Clinic, Faculty of Medicine, Charles University, Prague, Czech Republic. jwidi@lf1.cuni.cz
Physiological Research
|September 13, 2000
Summary
Insulin resistance is common in essential hypertension but less studied in secondary forms. This study found significant insulin resistance in patients with primary hyperaldosteronism, indicating varied insulin action in hypertension.
Area of Science:
- Endocrinology
- Metabolic Research
- Cardiovascular Disease
Background:
- Insulin resistance is a known factor in essential hypertension.
- Data on insulin resistance in secondary hypertension, specifically primary hyperaldosteronism (PH), is limited.
Purpose of the Study:
- To investigate the presence and extent of insulin resistance in patients with primary hyperaldosteronism.
- To compare insulin sensitivity in PH patients with healthy controls.
Main Methods:
- Utilized the hyperinsulinemic euglycemic clamp technique to assess glucose disposal rates.
- Evaluated insulin receptor characteristics on erythrocytes.
- Compared key metabolic parameters between 12 PH patients and control subjects.
Main Results:
- Patients with PH exhibited significantly lower glucose disposal rates (M).
- Tissue insulin sensitivity index (M/I) and metabolic clearance rate of glucose (MCRg) were markedly reduced in PH patients.
- No significant differences were observed in insulin receptor characteristics between PH patients and controls.
Conclusions:
- Insulin resistance is present in secondary hypertension, exemplified by primary hyperaldosteronism.
- This finding highlights the heterogeneity of impaired insulin action across different forms of arterial hypertension.
- Primary hyperaldosteronism is associated with metabolic dysfunction beyond its direct effects on blood pressure.