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Coronary Microvascular Dysfunction, Microvascular Angina, and Management.

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Coronary microvascular dysfunction (CMD) indicates poor prognosis in patients with or without coronary artery disease (CAD). New noninvasive imaging techniques help identify microvascular angina (MVA), aiding risk stratification.

Keywords:
Coronary microvascular dysfunctionMicrovascular anginaPrognosisTherapeutics

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Area of Science:

  • Cardiology
  • Vascular Medicine
  • Diagnostic Imaging

Background:

  • Coronary microvascular dysfunction (CMD) is increasingly recognized as a significant predictor of adverse outcomes in patients with and without obstructive epicardial coronary artery disease (CAD).
  • Microvascular angina (MVA), resulting from CMD, presents clinically with chest pain that is often indistinguishable from angina caused by epicardial CAD.
  • The historical diagnosis of cardiac syndrome X encompasses a heterogeneous group of patients, many of whom likely have underlying MVA.

Purpose of the Study:

  • To review the diagnostic capabilities of emerging noninvasive imaging techniques for identifying CMD and MVA.
  • To discuss the clinical implications of MVA in patients with and without obstructive CAD.
  • To highlight the current limitations in understanding and treating MVA.

Main Methods:

  • Review of recent analyses and literature on coronary microvascular dysfunction and microvascular angina.
  • Discussion of noninvasive imaging modalities including stress positron-emission tomography (PET) and cardiovascular magnetic resonance (CMR) myocardial perfusion imaging.
  • Analysis of patient populations previously categorized under cardiac syndrome X and those with persistent angina post-revascularization.

Main Results:

  • Noninvasive imaging techniques like stress PET and CMR myocardial perfusion imaging enable improved identification of MVA.
  • These tools allow differentiation of higher-risk from lower-risk patients within the MVA population, including those historically labeled as cardiac syndrome X.
  • MVA can also be diagnosed in patients with obstructive epicardial CAD experiencing persistent angina after revascularization.

Conclusions:

  • Emerging noninvasive imaging significantly enhances the diagnosis of microvascular angina (MVA).
  • Improved diagnostic capabilities allow for better risk stratification in patients with MVA.
  • Further research is needed to establish evidence-based treatment strategies and clarify the prognostic impact of MVA therapies.