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Related Experiment Videos

Supernormal contractility in primary hypertension without left ventricular hypertrophy.

G de Simone1, L Di Lorenzo, G Costantino

  • 1Institute of Internal Medicine and Metabolic Diseases, 2nd Medical School, University of Naples, Italy.

Hypertension (Dallas, Tex. : 1979)
|May 1, 1988
PubMed
Summary

Hypertension may initially enhance heart contractility through a supernormal inotropic state, a compensatory mechanism before left ventricular hypertrophy develops. This adaptation helps maintain systolic function under increased wall stress.

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Area of Science:

  • Cardiology
  • Physiology
  • Echocardiography

Background:

  • Primary hypertension can lead to left ventricular hypertrophy (LVH).
  • Early detection of systolic function changes is crucial for understanding hypertensive heart disease progression.
  • Assessing contractility independent of hypertrophy is key to understanding adaptation.

Purpose of the Study:

  • To evaluate systolic function and contractility in uncomplicated primary hypertension before compensatory hypertrophy.
  • To determine if hypertensive subjects exhibit altered inotropic states compared to normotensive controls.
  • To investigate the relationship between early cardiac adaptation and left ventricular mass.

Main Methods:

  • Two-dimensional targeted M-mode echocardiography in 43 hypertensive and 54 normotensive subjects.

Related Experiment Videos

  • Calculation of peak systolic pressure to end-systolic dimension ratio for left ventricular performance.
  • Generation of hypertrophy-independent indices of inotropic state using posterior wall thickness or cross-sectional area.

    • Main Results:

    • Hypertensive subjects showed normal fractional shortening despite increased end-systolic stress.
    • Systolic pressure/dimension ratio and hypertrophy-independent inotropic indices were elevated in hypertensives.
    • A subgroup of hypertensive subjects exhibited a 'supernormal' inotropic state with high contractility and inadequate hypertrophy.

    Conclusions:

    • A supernormal inotropic state may represent an early adaptive mechanism in hypertension.
    • This adaptation helps maintain systolic ventricular performance against elevated wall stress.
    • Early contractility changes occur before the development of significant left ventricular hypertrophy.