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Expanding concepts in ischaemic heart disease: implications for clinical practice and research
A Maseri1, V Pasceri, A Giordano
1Institute of Cardiology, Catholic University, Rome, Italy.
Insights
Myocardial infarction is often not caused by severe coronary artery blockage. Prognosis for ischemic heart disease depends more on patient factors like age and heart function than on detecting artery stenosis.
Area of Science:
- Cardiology
- Cardiovascular Research
- Internal Medicine
Background:
- Traditional views linked myocardial infarction primarily to critical coronary artery stenosis.
- Recent observations challenge this notion, indicating minimal or mild stenosis in many infarct-related arteries.
Purpose of the Study:
- To re-evaluate the prognostic significance of coronary stenosis in ischemic heart disease.
- To shift focus towards dynamic causes of ischemia and patient-specific prognostic factors.
Main Methods:
- Review of observational studies from the late 1980s.
- Analysis of infarct-related artery characteristics in myocardial infarction patients.
- Consideration of Bayesian theorem in diagnostic test accuracy.
Main Results:
- About two-thirds of myocardial infarction cases involved arteries with minimal or mild stenosis.
- Coronary stenosis detection has limited prognostic value unless associated with extensive ischemia or instability.
- Age, left ventricular function, effort tolerance, and angina stability are key prognostic determinants.
Conclusions:
- Prognostic assessment in ischemic heart disease should de-emphasize critical stenosis detection.
- Focus should shift to dynamic causes of ischemia and clinical factors like patient stability.
- Diagnostic test utility is highest in intermediate-risk groups, requiring high specificity for low-risk patients.
Abstract:
In the late Eighties, a series of observations from several institutions around the world has dramatically revolutionized the traditional notion that the occurrence of myocardial infarction was related most of the time to the development of critical flow-limiting coronary stenosis. All these studies showed that the infarct-related artery had only minimal or mild stenosis in about two thirds of the cases. Therefore, contrary to our previous beliefs, in clinical practice the detection of coronary stenosis has a lesser role in the prognostic assessment of patients with ischaemic heart disease, unless associated with extensive ischemia or with phases of instability. In fact, the major determinants of prognosis are represented by age, left ventricular function, effort tolerance and especially by the clinical stability or instability of angina. According to the Bayesian an theorem, in low risk patients any diagnostic test has a very low predictive accuracy, unless very high specificity criteria are used. The value of diagnostic tests in the assessment of patients' prognosis should be evaluated in intermediate risk groups. The emphasis of clinical research has, therefore, shifted from the detection of flow-limiting stenosis to the study of the multiple and varied dynamic causes of stable and unstable ischaemia, where the possibilities of making new, seminal observations are greater.