Disparate cardiovascular findings in men and women with essential hypertension

Area of Science:

• Cardiovascular Physiology
• Hypertension Pathophysiology
• Sex Differences in Medicine

Background:

• Essential hypertension, a common condition, presents with varying clinical outcomes between sexes.
• Epidemiological data suggest that women generally experience less severe consequences from hypertension compared to men.
• Understanding the underlying pathophysiological mechanisms driving these sex-based differences is crucial for targeted treatment strategies.

Purpose of the Study:

• To compare systemic hemodynamic, volume, and endocrine profiles between hypertensive women and men.
• To investigate the influence of menopause on cardiovascular differences between sexes.
• To elucidate the pathophysiological basis for the lower lethality of essential hypertension in women.

Main Methods:

• Systemic hemodynamic, volume, and endocrine parameters were measured in 100 hypertensive women and 100 men.
• Participants were meticulously matched for mean arterial pressure, age, race, and body surface area.
• Cardiovascular responses to isometric stress were assessed to evaluate differences under challenge.

Main Results:

• Women displayed higher resting heart rate, cardiac index, and pulse pressure, alongside lower total peripheral resistance than men (p < 0.01).
• Men exhibited a significantly greater increase in arterial pressure (nearly 50% higher) during isometric stress compared to women.
• These sex-based cardiovascular distinctions were significant in premenopausal but not postmenopausal individuals.

Conclusions:

• Premenopausal women possess a hemodynamically "younger" profile than age-matched men.
• Lower total peripheral resistance in women, irrespective of arterial pressure, signifies a reduced risk for hypertensive cardiovascular disease.
• The identified pathophysiological mechanisms provide a clear explanation for the observed lower mortality rates associated with essential hypertension in women.