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Hypertension and Age-Related Changes in the Heart

Implications for Drug Therapy

  • Review Article
  • Physiological Aspects of Aging
  • Published:
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Summary

Heart disease in older individuals can be characterised as the result of 2 processes, hypertension and atherosclerosis, which are the major causes of heart failure in the elderly population. The aging heart undergoes changes at the molecular, cellular and organ levels. These age-related changes may then be modulated by pathological conditions, such as hypertension, and by the reduction of blood pressure.

One characteristic of the aged heart is a limited capacity for adaptation, by hypertrophy, to increased mechanical load. This age-related attenuation of the hypertrophic response may be attributed to the diminished induction of proto-oncogenes such as c-fos, c-myc and c-jun. This diminution results from aging of the heart per se and may be modulated by extracardiac factors.

With regard to the coronary vasculature, the age at which hypertension develops seems to be an important factor for determining the vascularity of hypertrophied hearts. Late-onset hypertension is not accompanied by coronary angiogenesis, and it decreases dilator reserve in spite of the absence of myocardial hypertrophy. In contrast, mechanical overload in infant hearts is accompanied by angiogenesis and normal dilator reserve. In principle, the normalisation of hypertension results in the regression of myocardial hypertrophy and decreased coronary dilator reserve.

In aged hearts, it is not clear how hypertension-induced myocardial hypertrophy or coronary vascular changes regress. Although antihypertensive treatment is clearly associated with an improvement of cardiovascular mortality and morbidity in hypertensive elderly individuals, it remains unclear how treatments ameliorate the hypertension-induced alterations.

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  1. First Department of Internal Medicine, Tohoku University School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai, 980, Japan

    Shogen Isoyama

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Isoyama, S. Hypertension and Age-Related Changes in the Heart. Drugs & Aging 5, 102–115 (1994). https://doi.org/10.2165/00002512-199405020-00004

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