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Aortic distensibility and left ventricular structure and function in isolated systolic hypertension

A Dart1, C Silagy, E Dewar

  • 1Alfred & Baker Medical Unit, Baker Medical Research Institute, Melbourne, Australia.

European Heart Journal
|November 1, 1993
PubMed

Insights

Elderly individuals with isolated systolic hypertension exhibit increased aortic stiffness and altered left ventricular structure. These changes suggest hypertension may contribute to left ventricular hypertrophy, though causality is unclear.

Area of Science:

  • Cardiology
  • Gerontology
  • Biomedical Engineering

Background:

  • Isolated systolic hypertension (ISH) is common in the elderly.
  • Aortic mechanical properties and left ventricular (LV) structure/function are crucial in cardiovascular health.
  • Understanding the relationship between ISH and aortic stiffness is vital for managing cardiovascular risk.

Purpose of the Study:

  • To assess aortic mechanical properties in elderly subjects with untreated ISH.
  • To evaluate left ventricular structure and function in these subjects using echocardiography.
  • To investigate the potential link between increased aortic stiffness and left ventricular hypertrophy (LVH) in ISH.

Main Methods:

  • Two-dimensional echocardiography and Doppler were used to assess aortic distensibility, LV structure, and diastolic function.
  • Ten elderly subjects with ISH were compared to 16 age-matched normotensive controls.
  • Key echocardiographic parameters including aortic arch distensibility, interventricular septum thickness, and transmitral flow patterns were analyzed.

Main Results:

  • Subjects with ISH demonstrated significantly reduced aortic distensibility.
  • Hypertensive subjects showed increased interventricular septum thickness (approx. 20%) and wall-to-radius ratio (30%).
  • Altered transmitral diastolic flow patterns, including prolonged deceleration time and reduced early to late peak flow velocity ratio, were observed in ISH patients. LV systolic function remained preserved.

Conclusions:

  • ISH in the elderly is associated with increased aortic stiffness.
  • This increased aortic stiffness may contribute to the development of left ventricular hypertrophy.
  • The causal relationship between elevated systolic blood pressure and aortic stiffness in ISH requires further investigation.

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