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Determinants of collateral development in patients with acute myocardial infarction
Insights
A history of angina pectoris before acute myocardial infarction (AMI) is a significant predictor of well-developed coronary collateral circulation. This finding highlights angina as a clinical marker for collateral vessels, impacting infarct size and heart function.
Area of Science:
- Cardiology
- Vascular Biology
- Clinical Medicine
Background:
- Coronary collateral circulation significantly influences infarct size and left ventricular function post-acute myocardial infarction (AMI).
- Determinants of collateral development in AMI patients remain unclear.
- Understanding collateral circulation is crucial for improving outcomes in myocardial infarction.
Purpose of the Study:
- To elucidate the determinants of coronary collateral development in humans with AMI.
- To identify clinical factors predicting the presence of well-developed collateral circulation.
Main Methods:
- Coronary angiography was performed on 248 patients within 12 hours of a first AMI with complete coronary artery occlusion.
- Collateral circulation was graded based on contrast opacification of the infarct-related artery.
- Multivariate logistic regression analyzed predictors including preinfarction angina, coronary artery disease severity, age, gender, and risk factors.
Main Results:
- 37.1% of patients exhibited well-developed collateral circulation.
- Patients with a history of angina pectoris prior to AMI had a significantly higher prevalence (57%) of well-developed collaterals compared to those without (26%).
- A history of angina pectoris was the only significant independent predictor of collateral development (p < 0.0001).
Conclusions:
- A history of angina pectoris preceding AMI serves as a clinical marker for coronary stenoses.
- Severe coronary stenoses, indicated by angina, likely stimulate collateral vessel development.
- Angina history is a valuable clinical marker for assessing coronary collateralization in AMI patients.
Background:
The presence or absence of collateral circulation to the infarct-related coronary artery in acute myocardial infarction (AMI) significantly impacts on infarct size and resulting left ventricular function. However, the determinants of collateral development have not been clarified.
Hypothesis:
The purpose of this study was to elucidate the determinants of collateral development in humans.
Methods:
The study group consisted of 248 patients (178 men, 70 women; mean age 63 years) undergoing coronary angiography within 12 h after the onset of a first AMI. All patients exhibited complete occlusion of the infarct-related artery. The extent of collateral circulation to the area perfused by the infarct-related artery was graded as none, or poorly or well developed, depending on the degree of opacification of the occluded coronary artery on the contralateral injection of contrast.
Results:
Well-developed collateral circulation was observed in 92 of the 248 patients (37.1%). The prevalence of well-developed collaterals was 57% in patients with a history of angina pectoris prior to AMI, which was significantly (p < 0.0001) higher than the 26% in those without a history of angina. Multivariate stepwise logistic regression analysis was then applied to identify predictors of collateral development. Possible determinants of collateral development were long-standing preinfarction angina, severity of coronary artery disease, age, gender, and coronary risk factors (hypertension, diabetes, hypercholesterolemia, smoking). This analysis revealed that only the presence of a history of angina pectoris prior to AMI was a significant predictor of collateral development (p < 0.0001).
Conclusions:
A history of angina pectoris prior to AMI is a clinical marker for coronary stenoses. Since severe coronary stenoses can provide stimuli that lead to collateral development, it is reasonable that a history of angina would also be a clinical marker for collateral vessels.