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The definition of myocardial infarction during aortocoronary bypass surgery
Insights
Diagnostic criteria for perioperative acute myocardial infarction (AMI) show low performance in aortocoronary bypass patients. Many patients lacked diagnostic criteria, indicating a need for improved diagnostic methods post-CABG surgery.
Area of Science:
- Cardiology
- Cardiac Surgery
Background:
- Perioperative acute myocardial infarction (AMI) is a significant complication following coronary artery bypass grafting (CABG).
- Accurate diagnosis of perioperative AMI is crucial for patient management and outcomes.
Purpose of the Study:
- To evaluate the diagnostic performance of established criteria for perioperative acute myocardial infarction (AMI) in patients undergoing CABG.
Main Methods:
- A cohort of 392 CABG patients was analyzed.
- Postoperative data including new Q waves, intraventricular conduction disturbances, cardiogenic shock, and elevated CK-MB levels were collected.
- Patients were categorized based on the number of positive diagnostic criteria for AMI.
Main Results:
- Only a small proportion of patients met the diagnostic criteria for perioperative AMI (16 with Q waves, 29 with conduction disturbance, 17 with shock, 14 with CK-MB elevation).
- A significant majority (336/392) had none of the diagnostic criteria.
- The presence of arrhythmias and ST-T changes correlated with the number of positive criteria.
- Autopsy findings in five deceased patients were partially predicted by the diagnostic criteria.
Conclusions:
- The current diagnostic criteria for perioperative AMI exhibit low diagnostic performance in the CABG population.
- Further research is needed to develop more sensitive and specific diagnostic tools for perioperative myocardial infarction after CABG.
Abstract:
In a study of 392 aortocoronary bypass (CABG) patients, we found 16 patients with a postoperative new Q wave, 29 patients with new intraventricular conduction disturbance, 17 patients with cardiogenic shock, and 14 patients with excessive CK-MB activity. Those criteria were considered as diagnostic of perioperative acute myocardial infarction (AMI). Listing the 392 patients in a Venn diagram: five patients had three positive criteria, eight had two, 43 had one, and 336 had none. Ventricular arrhythmia, supraventricular arrhythmia, or ST-T changes occurred in decreasing frequency in patients with a decreasing number of positive criteria. Five patients died postoperatively and in four a postmortem examination was available. Diagnostic criteria partly predicted autopsy findings. We conclude that the diagnostic criteria of perioperative myocardial infarction have a low diagnostic performance.