Cardiovascular autonomic function tests to provide normative data from a healthy older population

Area of Science:

• Cardiology
• Neurology
• Gerontology

Background:

• Cardiovascular autonomic function tests (AFT) are crucial for assessing autonomic nervous system health.
• Normative data for AFT in older populations are essential for accurate clinical interpretation.
• Aging can affect autonomic responses, necessitating age-specific reference values.

Purpose of the Study:

• To derive normative data for various cardiovascular autonomic function tests in a healthy older population.
• To investigate the influence of age and gender on specific autonomic function parameters.
• To identify AFT measures that are robust against age-related changes for clinical utility.

Main Methods:

• Conducted cardiovascular autonomic function tests on 48 healthy control subjects (mean age 58 years).
• Measured heart rate (HR) response to deep breathing (HR(DB)), Valsalva ratio (VR), and blood pressure (BP) responses during the Valsalva maneuver.
• Assessed BP recovery times (PRT 100, PRT 50) and responses to head-up tilting.

Main Results:

• Systolic blood pressure (SBP) early phase 2 amplitude showed an inverse relationship with age (p=0.03).
• A trend for progressive attenuation of SBP late phase 2 amplitude with age was observed (p=0.09).
• Systolic BP recovery time was not significantly affected by age, gender, or body mass index.

Conclusions:

• Age significantly impacts most cardiovascular autonomic function test variables.
• Systolic BP recovery time is a reliable measure, unaffected by age and gender.
• Systolic BP recovery time holds potential for evaluating adrenergic failure in clinical practice.