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Pseudo-myocardial infarction pattern after aortocoronary saphenous vein bypass graft surgery. A case report
Insights
Post-coronary artery bypass graft surgery, new ECG Q waves may indicate post-pericardiotomy syndrome, not acute myocardial infarction. Nuclear imaging is crucial for accurate diagnosis, differentiating pseudo-MI from actual heart damage.
Area of Science:
- Cardiology
- Cardiovascular Surgery
- Diagnostic Imaging
Background:
- Atherosclerotic coronary artery disease necessitates interventions like aortocoronary saphenous vein bypass grafting.
- Postoperative electrocardiogram (ECG) changes can mimic serious complications.
Observation:
- A patient developed QS waves on ECG post-bypass surgery, suggesting myocardial infarction (MI).
- Nuclear imaging (technetium-99m, thallium-201 scintiscans) excluded acute MI.
- Acute pericarditis occurred two weeks post-surgery, complicating clinical assessment.
Findings:
- The ECG findings were attributed to a pseudo-MI pattern, likely due to post-pericardiotomy syndrome.
- Distinguishing between true MI and other causes of Q waves is critical.
Implications:
- Accurate exclusion of postoperative acute myocardial infarction is vital for patient management.
- Understanding differential diagnoses for ECG changes after bypass surgery improves clinical decision-making.
Abstract:
In a 51-year-old medical colleague with symptomatic atherosclerotic coronary artery disease, coronary arteriography delineated significant left mainstem, left anterior descending and left circumflex coronary artery lesions and cine angiography demonstrated normal left ventricular contractility. Aortocoronary saphenous vein bypass grafting was successful. The postoperative appearance of QS waves on the ECG suggested the possible complication of an acute transmural anteroseptal and anterolateral myocardial infarction (MI). However, this possibility was excluded by resting technetium-99m and thallium-201 scintiscans, as well as by a technetium-99m-gated blood pool scintiscan. The occurrence of acute pericarditis approximately 2 weeks after surgery made clinical evaluation more difficult. The ECG may represent a pseudo-MI pattern, the patient having suffered a post-pericardiotomy syndrome. The importance of excluding postoperative acute MI is stressed. The causes of the appearance of new Q waves after aortocoronary saphenous vein bypass graft surgery are briefly outlined.