Ventricular performance in human hearts aged 61 to 73 years

Area of Science:

• Cardiology
• Gerontology
• Physiology

Background:

• Cardiac preload significantly influences left ventricular (LV) performance.
• Age-related changes in cardiovascular function are well-documented, but specific responses to preload alterations require further investigation.

Purpose of the Study:

• To investigate the effects of altered cardiac preload on LV performance in older adults.
• To compare the LV response to preload changes between older and younger healthy individuals.

Main Methods:

• Two-dimensional echocardiography was used to assess LV volumes.
• Cardiac preload was manipulated using head-down tilt and lower body negative pressure.
• Participants included healthy older adults (61-73 years) and younger adults (21-28 years).

Main Results:

• Older subjects exhibited diminished changes in LV end-diastolic and stroke volumes compared to younger subjects.
• Despite smaller volumetric changes, older adults' LV performance remained within normal functional curve parameters.
• Older subjects had larger baseline LV end-diastolic and end-systolic volumes.

Conclusions:

• Alterations in cardiac preload affect LV volumes in older adults, consistent with normal LV function.
• The diminished magnitude of these responses suggests an age-related increase in diastolic stiffness.
• These findings highlight age-related cardiovascular adaptations in response to hemodynamic challenges.