Age dependency of left ventricular diastolic function in pressure overload hypertrophy

Area of Science:

• Cardiology
• Gerontology
• Cardiovascular Physiology

Background:

• Left ventricular (LV) adaptation to pressure overload involves complex hormonal, structural, and hemodynamic factors.
• Elderly patients may exhibit distinct responses to chronic pressure overload conditions.

Purpose of the Study:

• To determine if age is a significant factor in left ventricular (LV) pressure overload hypertrophy.
• To investigate the influence of diastolic function on the aging process in the context of LV pressure overload.

Main Methods:

• Utilized LV biplane cineangiography, micromanometry, and endomyocardial biopsies in 57 patients with aortic stenosis.
• Categorized patients into senior (<60 years) and elderly (≥65 years) groups for comparative analysis.
• Assessed LV systolic and diastolic function, along with myocardial structural changes like interstitial fibrosis.

Main Results:

• Elderly patients (>65 years) showed significantly higher LV peak systolic and end-diastolic pressures compared to senior patients (<60 years).
• While LV systolic function (ejection fraction, fractional shortening) was comparable, diastolic function was impaired in the elderly group (increased stiffness, reduced peak filling rate).
• A significant positive correlation was found between age and myocardial stiffness, and an inverse relation between age and early peak filling rate.

Conclusions:

• Elderly patients (>65 years) demonstrate more severe left ventricular (LV) hypertrophy in response to aortic stenosis compared to younger patients.
• Age is a determinant of LV pressure overload hypertrophy, leading to more pronounced diastolic dysfunction in older individuals.
• Preserved systolic function in the elderly suggests an age-dependent exhaustion of adaptive mechanisms or prolonged exposure to pressure overload.