Routine preoperative exercise testing in patients undergoing major noncardiac surgery

Area of Science:

• Cardiology
• Anesthesiology
• Geriatric Medicine

Background:

• Assessing perioperative cardiac risk is crucial for older patients undergoing major noncardiac surgery.
• Preoperative exercise testing is one method used to evaluate cardiac risk.

Purpose of the Study:

• To evaluate the utility of preoperative exercise testing in predicting cardiac events in patients over 40 undergoing elective major noncardiac surgery.
• To compare the predictive value of exercise testing with resting electrocardiograms (ECGs) for perioperative cardiac risk.

Main Methods:

• A prospective study involving 200 patients aged over 40 scheduled for elective major noncardiac surgery.
• Patients underwent preoperative exercise testing and serial ECGs, with serum creatine kinase (CK) and CK-MB levels monitored.
• Primary endpoints included postoperative death and myocardial infarction; secondary endpoints included suspected ischemia/injury.

Main Results:

• Abnormal exercise test responses occurred in 21.5% of patients.
• Overall endpoint events occurred in 3% (primary) and 14% (secondary).
• While endpoint events were more common with abnormal exercise tests, multivariate analysis showed only the preoperative ECG was a significant independent predictor of risk (23% vs 7%, p < 0.002).

Conclusions:

• Preoperative exercise testing does not add substantial value to risk stratification beyond resting ECGs in this patient population.
• Resting ECG is a more reliable independent predictor of perioperative cardiac events.
• Routine preoperative exercise testing is not recommended for assessing perioperative risk in older adults before major elective noncardiac surgery.