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[Differences in hemodynamic responses to dynamic exercise between borderline and sustained hypertension].

M Shimizu1, T Tsuyusaki, C Noro

  • 1Department of Internal Medicine, Kitasato University School of Medicine, Kanagawa.

Journal of Cardiology
|June 1, 1987
PubMed
Summary

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Elevated blood pressure causes left ventricular hypertrophy (LVH), impairing cardiac function in sustained hypertension. Borderline hypertension shows septal hypertrophy but preserved cardiac index, with reduced regional function during exercise.

Area of Science:

  • Cardiology
  • Hypertension Research
  • Cardiac Physiology

Background:

  • Left ventricular hypertrophy (LVH) is a common adaptation to hypertension.
  • Understanding the impact of varying blood pressure levels on cardiac structure and function is crucial for cardiovascular health.
  • Assessing cardiac function during rest and exercise provides insights into the severity of hypertensive heart disease.

Purpose of the Study:

  • To investigate the effects of anatomical distribution of LVH and blood pressure differences on cardiac function.
  • To compare cardiac function in borderline hypertensives, sustained hypertensives, and normal controls at rest and during dynamic exercise.

Main Methods:

  • M-mode echocardiography was used to estimate LVH.
  • Radionuclide (RI) first pass and multigate methods assessed cardiac function.

Related Experiment Videos

  • Subjects underwent graded ergometer exercise (0.5 and 1.0 watt/kg) in a supine position.

    • Main Results:

    • Borderline hypertension exhibited significant interventricular septal hypertrophy and increased left ventricular mass index compared to controls.
    • Cardiac index was reduced in sustained hypertension but not in borderline hypertension.
    • Left ventricular ejection fraction (LVEF) decreased during exercise in sustained hypertension, correlating inversely with LVH.
    • Peak filling rate (PFR) was reduced in sustained hypertension, correlating positively with LVEF.

    Conclusions:

    • Elevated blood pressure is a primary cause of LVH.
    • Sustained hypertension leads to impaired cardiac function, evidenced by reduced cardiac index and LVEF during exercise.
    • Borderline hypertension may involve regional septal dysfunction due to hypertrophic imbalances.