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Con: intraoperative myocardial ischemia is not benign
1Department of Anesthesia, St. Boniface General Hospital, Winnipeg, Manitoba, Canada.
Insights
Intraoperative ischemia during surgery, especially coronary artery bypass grafting (CABG), is a significant predictor of adverse outcomes. Monitoring and preventing this ischemia in high-risk patients is crucial for improving surgical results.
Area of Science:
- Anesthesiology
- Cardiovascular Surgery
- Critical Care Medicine
Background:
- Intraoperative ischemia is consistently linked to adverse patient outcomes across various surgical settings.
- In Coronary Artery Bypass Grafting (CABG), both prebypass and postbypass ischemia are significant predictors of adverse events.
- Postbypass ischemia in CABG patients carries a substantial risk of adverse outcomes, highlighting the need for prevention strategies.
Purpose of the Study:
- To emphasize the critical importance of intraoperative ischemia as a predictor of adverse outcomes in both cardiac and non-cardiac surgery.
- To highlight the prognostic value of intraoperative ischemia monitoring.
- To advocate for increased vigilance and tailored management for patients identified with intraoperative ischemia.
Main Methods:
- The study reviews existing literature and clinical findings on intraoperative ischemia.
- Analysis of predictive values (sensitivity, positive predictive power, specificity) of intraoperative versus postoperative ischemia.
- Assessment of the clinical availability and utility of intraoperative monitoring techniques.
Main Results:
- Intraoperative ischemia is a critical predictor of adverse outcomes, with approximately one in three patients experiencing negative consequences.
- Postbypass ischemia in CABG surgery is particularly ominous, and its prevention may improve outcomes.
- While less sensitive than postoperative ischemia, intraoperative ischemia monitoring offers superior positive predictive power and specificity, and is more widely available.
Conclusions:
- Intraoperative ischemia in CABG and non-cardiac surgery is a serious sign that warrants significant concern from anesthesiologists.
- Identifying patients with intraoperative ischemia defines a high-risk group requiring specialized monitoring and treatment.
- Considering intraoperative ischemia as benign is not supported by current clinical evidence.
Abstract:
The principal importance of intraoperative ischemia is its consistent association with adverse outcome. In coronary artery surgery the finding of prebypass ischemia is an important predictor, and postbypass ischemia is a critical predictor of adverse outcome. One in three patients with postbypass ischemia will suffer an adverse outcome in CABG. Furthermore, prevention of postbypass ischemia may improve outcome in CABG. Clearly, intraoperative ischemia in CABG surgery is an ominous sign that should be regarded with the utmost concern by anesthesiologists. In noncardiac surgery, intraoperative ischemia also indicates about a one in three chance of adverse outcome. Although it is less sensitive than postoperative ischemia, it may have superior positive predictive power and specificity. Most importantly, intraoperative monitoring for ischemia is currently available to most patients, whereas extended postoperative monitoring is not. The finding of intraoperative ischemia defines a high-risk group of patients who may merit special monitoring and treatment. To regard intraoperative ischemia as benign would be inconsistent with available information.