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[Angiographic findings in non-Q wave infarction and their relation to ST-T changes]
H Chamorro1, I Barquín, P Gómez
1Centro Cardiovascular, Hospital Clínico Universidad de Chile, Santiago.
Insights
Non-ST elevation myocardial infarction (NSTEMI) often involves coronary artery disease. This study found ST depression in NSTEMI patients correlated with more severe coronary artery disease, suggesting a poorer prognosis.
Area of Science:
- Cardiology
- Internal Medicine
- Vascular Biology
Background:
- Non-Q wave myocardial infarction (NQMI) etiology is complex, involving vessel occlusion, early reperfusion, or collateral flow.
- Understanding the coronary anatomy and ECG findings in NQMI is crucial for patient management.
Purpose of the Study:
- To analyze coronary arteriography findings in patients with NQMI.
- To investigate the relationship between coronary artery disease severity, culprit vessel status, and ECG changes in NQMI.
Main Methods:
- Retrospective analysis of coronary arteriography in 84 NQMI patients.
- Assessment of culprit vessel lesions, artery occlusion, and collateral flow.
- Analysis of ST segment changes (depression, elevation, T wave alterations) in 82 patients.
Main Results:
- Single vessel disease was most common (36%), followed by two (24%) and three vessel disease (19%).
- The culprit artery had a critical residual lesion in 45% of cases; 38% had an occluded artery, with circumflex most frequently affected (20 patients).
- ST depression was observed in 35% of patients and was significantly associated with severe coronary artery disease (main left or three-vessel disease).
Conclusions:
- NQMI presentation is linked to varying degrees of coronary artery disease.
- ST depression in NQMI patients may indicate more extensive coronary artery disease and potentially a worse prognosis.
- Further research is needed to clarify the prognostic implications of specific ECG findings in NQMI.
Abstract:
Non q wave myocardial infarction has been attributed to occlusion of a vessel with no ECG representation, early reperfusion of the occluded artery or occlusion of a vessel with generous collateral flow. The coronary arteriography of 84 patients with non Q wave myocardial infarction performed at 16 + 17 (SD) days after infarction was analyzed. Main left lesion was found in 6 (17%), single vessel disease in 30 (36%), two vessel disease in 18 (24%) and 3 vessel disease in 16 (19%). The "culprit" vessel had a critical residual lesion in 38 patients (45%): 22 affected the left anterior descending artery, 10 the circumflex, and 5 the right coronary artery. No residual lesion was found in 10 patients (12%). An occluded artery was found in 32 patients (38%): circumflex in 20, right coronary artery in 9 and left anterior descending in 3 (p < 0.01). Significant collateral flow to the occluded vessel was present in 41% of cases. The ST segment was analyzed in 82 patients. Depression of ST was found in 29 (35%), elevation in 22 (27%), negative T waves in 17 (21%) and minimal alterations in 17%. There was no correlation between ST levels and coronary occlusion of the culprit artery. Depression of ST was more commonly (p < 0.01) associated with severe coronary artery disease (main left or 3 vessel disease), which may be related to the poorer prognosis in these cases.