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In older adults, higher blood pulse pressure correlates with increased arterial blood flow pulsatility. Conversely, elevated heart rate is linked to reduced brain tissue pulsatility, impacting cerebral blood flow.

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Area of Science:

  • Cardiovascular Physiology
  • Neuroimaging
  • Biomedical Engineering

Background:

  • The HIPAC Trial investigates relationships between blood pressure, heart rate, and intracranial pulsatility in older adults.
  • Understanding these dynamics is crucial for assessing cerebrovascular health in aging populations.

Purpose of the Study:

  • To examine the correlation between blood pressure metrics (pulse pressure) and arterial blood flow pulsatility.
  • To investigate the relationship between heart rate and brain tissue pulsatility.
  • To explore the connection between cerebral blood volume per cardiac cycle (CBV-C) and brain tissue pulsatility.

Main Methods:

  • Utilized 2D CINE Phase Contrast (PC) MRI on 85 older adults (65 ± 6 years) to measure brain blood flow and tissue pulsatility.
  • Quantified arterial blood flow pulsatility in internal carotid arteries (ICAs) and global brain tissue pulsatility.
  • Collected 24-hour ambulatory blood pressure and heart rate data.

Main Results:

  • Positive correlations observed between pulse pressure and ICA blood flow pulsatility (R = 0.414–0.466).
  • Significant negative correlations found between heart rate and global brain tissue pulsatility (R = -0.452–-0.830).
  • Heart rate negatively correlated with CBV-C (R = -0.577), while CBV-C positively correlated with brain tissue pulsatility (R = 0.562).

Conclusions:

  • Blood pulse pressure is positively associated with arterial blood flow pulsatility in older adults.
  • Heart rate demonstrates a negative correlation with brain tissue pulsatility in this demographic.
  • Findings highlight the interplay between cardiovascular parameters and cerebrovascular pulsatility in aging.