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Related Experiment Videos

Insulin resistance in essential hypertension.

E O Muscelli1, M J Saad, J A Gontijo

  • 1Departamento de Clínica Médica, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, SP, Brasil.

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|January 1, 1990
PubMed
Summary

Essential hypertension may be linked to insulin resistance and increased sympathetic nervous system activity. Hyperinsulinemia in hypertensive patients might elevate blood pressure through various mechanisms, including sympathetic stimulation.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Metabolic Syndrome

Background:

  • Essential hypertension is a common condition with multifactorial causes.
  • Insulin resistance and sympathetic nervous system (SNS) activity are implicated in cardiovascular disease.
  • The relationship between insulin resistance and SNS activity in hypertension requires further elucidation.

Purpose of the Study:

  • To investigate the potential association between insulin resistance and sympathetic nervous system activity in patients with essential hypertension.
  • To compare SNS activity in hypertensive and normotensive individuals following an oral glucose tolerance test.

Main Methods:

  • A case-control study involving 14 hypertensive and 14 normotensive subjects.
  • Measurement of plasma glucose and insulin levels during an oral glucose tolerance test.

Related Experiment Videos

  • Assessment of sympathetic nervous system activity using the double cross index.

    • Main Results:

    • Hypertensive subjects exhibited significantly higher plasma glucose and insulin levels post-glucose load compared to normotensive subjects.
    • Five out of 14 hypertensive patients displayed hyperinsulinemia.
    • Normotensive volunteers showed a greater increase in the double cross index after glucose loading than hyperinsulinemic hypertensive subjects.
    • No significant change in the double cross index was observed in normoinsulinemic hypertensive subjects.

    Conclusions:

    • A significant portion of hypertensive patients present with insulin resistance, hyperglycemia, impaired cardiac response, and hyperinsulinemia.
    • Hyperinsulinemia may contribute to the development of hypertension by enhancing sympathetic nervous system activity.
    • Other potential mechanisms, such as altered calcium transport, may also link hyperinsulinemia to hypertension.