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Beyond Coronary Artery Disease: Assessing the Microcirculation

Sonal Pruthi1, Emaad Siddiqui1, Nathaniel R Smilowitz2

  • 1Division of Cardiology, Department of Medicine, NYU Langone Health, 550 First Avenue, New York, NY 10016, USA.

Rheumatic Diseases Clinics of North America
|June 28, 2024
PubMed

Insights

Ischemic heart disease (IHD) affects millions, yet many patients lack blockages in major arteries. Microvascular angina due to coronary microvascular dysfunction (CMD) is a key cause, highlighting the need for better understanding and treatment of CMD.

Area of Science:

  • Cardiology
  • Vascular Biology
  • Internal Medicine

Background:

  • Ischemic heart disease (IHD) impacts over 20 million US adults.
  • Atherosclerosis of epicardial coronary arteries is the traditional cause of IHD.
  • Nearly half of patients with stable angina and IHD lack obstructive epicardial coronary artery disease.

Purpose of the Study:

  • To explore the significance of ischemia with nonobstructive coronary arteries (INOCA).
  • To highlight coronary microvascular dysfunction (CMD) as a common cause of INOCA and microvascular angina.
  • To emphasize the potential of improved understanding and management of CMD for IHD patient outcomes.

Main Methods:

  • Review of current literature on IHD, INOCA, and CMD.
  • Analysis of diagnostic approaches for coronary microvascular dysfunction.
  • Discussion of therapeutic strategies for patients with microvascular angina.

Main Results:

  • Coronary microvascular dysfunction (CMD) is a frequent underlying cause of ischemia in patients without obstructive epicardial coronary artery disease.
  • Microvascular angina is a clinical manifestation of CMD.
  • Current diagnostic and treatment paradigms for CMD are evolving.

Conclusions:

  • CMD is a critical, often overlooked, contributor to ischemic heart disease.
  • Further research into the pathophysiology, diagnosis, and treatment of CMD is essential.
  • Addressing CMD offers a promising avenue to improve clinical outcomes for a significant patient population experiencing IHD.

Keywords:
Coronary flow reserveCoronary microvascular diseaseCoronary microvascular dysfunctionCoronary physiologyHyperemic microvascular resistanceINOCAIndex of microcirculatory resistanceIschemia with nonobstructive coronary arteries

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