Related Experiment Videos
Syndrome X: pathophysiology and clinical management
1Department of Medicine, Veterans General Hospital-Taipei, Taiwan, R.O.C.
Insights
Syndrome X, characterized by chest pain and normal coronary angiograms, involves impaired coronary microvascular function and sometimes abnormal pain perception. Management requires identifying individual causes of angina and ischemia.
Area of Science:
- Cardiology
- Clinical Medicine
- Pathophysiology
Background:
- Syndrome X presents with anginal chest pain and ECG changes, but normal coronary angiograms and no coronary spasm.
- While sharing symptoms with coronary artery disease, Syndrome X has distinct underlying mechanisms.
- Patients often exhibit normal coronary angiograms despite experiencing chest pain and myocardial ischemia.
Purpose of the Study:
- To elucidate the heterogeneous nature of Syndrome X.
- To differentiate the pathogenesis of Syndrome X from coronary artery disease.
- To highlight the importance of identifying underlying mechanisms for effective patient management.
Main Methods:
- Review of clinical presentations of patients diagnosed with Syndrome X.
- Analysis of studies investigating coronary microvascular function in Syndrome X.
- Examination of evidence regarding abnormal pain perception as a cause of chest pain.
Main Results:
- Coronary microvascular dysfunction is a key finding in Syndrome X.
- Myocardial ischemia in Syndrome X can be varied, subclinical, and regionally distributed.
- Abnormal pain perception contributes to chest pain in some Syndrome X patients.
- Syndrome X is a heterogeneous condition with multifactorial causes.
Conclusions:
- Effective management of Syndrome X necessitates personalized approaches based on individual clinical presentation.
- Identifying the specific mechanisms of anginal chest pain and/or myocardial ischemia is crucial for Syndrome X patients.
- Understanding the heterogeneity of Syndrome X, including microvascular dysfunction and altered pain perception, is key for treatment strategies.
Abstract:
The term "syndrome X" is now widely used to specify a group of patients with anginal chest pain, ischemia-like electrocardiogram, normal coronary angiograms, and no evidence of coronary spasm. Though chest pain and exercise-induced myocardial ischemia may both be present in patients with syndrome X and those with coronary artery disease, the underlying pathogenesis of these two disease entities is different. In patients with syndrome X, the causes of angina and myocardial ischemia are multifarious while coronary angiograms are normal. Coronary microvascular function has been shown to be impaired in these patients. However, the presentation of myocardial ischemia may be varied and even subclinical, suggesting dynamic characteristics and regional distribution of coronary microvascular insufficiency in them. Recently, there is increasing evidence that chest pain may develop without detectable myocardial ischemia and has been attributed to abnormal pain perception in at least some of the patients. Thus, there is a heterogeneous group of patients with syndrome X. The rational patient management should be related to individual clinical presentation and depend upon the proper identification of the underlying mechanisms of anginal chest pain or myocardial ischemia or both in these patients.