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Pulsatile flow: a critical modulator of the natural history of atherosclerosis

Yiannis S Chatzizisis1, George D Giannoglou

  • 1Cardiovascular Engineering and Atherosclerosis Laboratory, 1st Cardiology Department, AHEPA University Hospital, Medical School, Aristotle University of Thessaloniki, 1 St. Kyriakidi Street, 54636 Thessaloniki, Greece. joc@med.auth.gr

Medical Hypotheses
|March 21, 2006
PubMed

Insights

Reducing heart rate may slow atherosclerosis progression. Lowering heart rate potentially alleviates the atherogenic hemodynamic environment, offering insights into the benefits of heart rate-lowering drugs like beta-blockers for atherosclerosis.

Area of Science:

  • Cardiovascular Science
  • Biomedical Engineering
  • Pathophysiology

Background:

  • Atherosclerosis is a multi-focal systemic disease with independent progression or regression in patients.
  • Low and oscillatory shear stress, influenced by coronary geometry, creates an atherogenic microenvironment, affecting disease progression.
  • The precise role of blood flow pulsation in atherosclerosis remains unclear.

Purpose of the Study:

  • To investigate the hypothesis that pulsatile blood flow, a major generator of oscillatory shear stress, may synergistically promote atherosclerosis lesion progression.
  • To explore the potential of reducing heart rate to decelerate atherosclerosis by mitigating the local atherogenic hemodynamic environment.

Main Methods:

  • This study is primarily theoretical, hypothesizing based on known hemodynamic principles.
  • It examines the relationship between heart rate, flow pulsation frequency, and shear stress in coronary arteries.
  • The study considers the known efficacy of heart rate-lowering agents in managing atherosclerosis.

Main Results:

  • Pulsatile blood flow, driven by heart rate, generates oscillatory shear stress, potentially accelerating atherosclerosis.
  • Reducing heart rate decreases flow pulsation frequency, which may alleviate the atherogenic hemodynamic environment.
  • This suggests a potential mechanism for the anti-atherosclerotic effects of heart rate-lowering drugs.

Conclusions:

  • Heart rate reduction is hypothesized to decelerate atherosclerosis progression by improving local hemodynamics.
  • This provides a potential mechanistic insight into the beneficial effects of beta-blockers and similar agents in treating atherosclerosis.

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