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[Microvascular angina and syndrome X]
Juan Carlos Kaski1, Ruth Pérez Fernández
1Coronary Artery Disease Research Unit, Cardiological Sciences, St. George's Hospital Medical School, London, United Kingdom. jkaski@sghms.ac.uk
Revista Espanola De Cardiologia
|January 1, 2005
Summary
Cardiac Syndrome X, characterized by chest pain and normal angiograms, may stem from microvascular endothelial dysfunction. Elevated endothelin-1 (ET-1) levels suggest a role in coronary flow abnormalities, though myocardial ischemia remains debated.
Area of Science:
- Cardiology
- Vascular Biology
- Pathophysiology
Context:
- Cardiac Syndrome X (CSX) presents with chest pain, ECG changes, and normal coronary arteries, posing a diagnostic challenge.
- The underlying cause of CSX has been debated for over 30 years, with theories including myocardial ischemia and microvascular dysfunction.
Purpose:
- To review the evidence supporting myocardial ischemia as a pathogenic mechanism in Cardiac Syndrome X.
- To explore the role of microvascular endothelial dysfunction and endothelin-1 (ET-1) in the pathophysiology of CSX.
Summary:
- CSX patients exhibit abnormal perfusion scans, altered coronary sinus blood gases, and lactate production during chest pain, suggesting ischemia.
- Studies indicate transient myocardial ischemia in some CSX patients, potentially linked to microvascular endothelial dysfunction and elevated ET-1.
- Contrasting evidence questions ischemia, citing good prognosis and lack of wall motion abnormalities on stress echocardiography.
Impact:
- This review clarifies the ongoing debate regarding the causes of Cardiac Syndrome X.
- It highlights the potential contribution of microvascular dysfunction and ET-1 to CSX pathophysiology.
- Understanding the mechanisms of CSX is crucial for accurate diagnosis and effective patient management.