—Transesophageal echocardiography (TEE) and 12-lead electrocardiography (ECG) are sophisticated techniques that are increasingly being used to monitor for myocardial ischemia during noncardiac surgery. We examined whether the routine use of these techniques has incremental clinical value in identifying patients at high risk for perioperative ischemic outcomes when compared with preoperative clinical data and intraoperative monitoring using continuous two-lead bipolar ECG.
—Veterans Affairs medical center.
—A total of 332 men undergoing noncardiac surgery who had or were at high risk for coronary artery disease.
—TEE, 12-lead ECG, and two-lead ECG were performed continuously during noncardiac surgery (47% vascular, 53% nonvascular). Monitoring results were not available to anesthesiologists or surgeons, and data were blindly analyzed after surgery.
Main Outcome Measure.
—Perioperative ischemic outcomes (cardiac death, nonfatal myocardial infarction, unstable angina).
—In a subset of 285 patients who were adequately studied by all three techniques, 111 patients (39%) were identified as having intraoperative myocardial ischemia (by one or more monitoring techniques). By univariate analysis, intraoperative ischemia was associated with all perioperative cardiac outcomes, including ischemic outcomes, congestive heart failure, and ventricular tachycardia (P≤.02 for each of the three monitoring techniques). However, when monitoring results for TEE and 12-lead ECG were added to a multivariate model that included preoperative clinical data and continuous two-lead ECG results, the incremental value of TEE was small (odds ratio, 2.6; 95% confidence interval [Cl], 1.2 to 5.7; P=.02) and that of 12-lead ECG was not significant (odds ratio, 1.5; 95% Cl, 0.6 to 3.8). Furthermore, when the multivariate analysis was repeated with only ischemic outcomes, neither TEE nor 12-lead ECG retained significant associations (odds ratio, 2.2; 95% Cl, 0.5 to 9.4, and odds ratio, 1.1; 95% Cl, 0.2 to 6.1, respectively).
—When compared with preoperative clinical data and intraoperative monitoring using two-lead ECG, routine monitoring for myocardial ischemia with TEE or 12-lead ECG during noncardiac surgery has little incremental clinical value in identifying patients at high risk for perioperative ischemic outcomes.(JAMA. 1992;268:210-216)
Eisenberg MJ, London MJ, Leung JM, Browner WS, Hollenberg M, Tubau JF, Tateo IM, Schiller NB, Mangano DT, Krupski WC, Rapp JA, Hedgcock MW, Verrier ED, Merrick S, Meyer ML, Levenson L, Wong MG, Layug E, Li J, Franks ME, Wellington YC, Balasubramanian M, Cembrano E, Velasco W, Pineda N, Katiby SN, Miller T, von Ehrenburg W, O'Kelly BF, Szlachcic J, Knight AA, Fegert V, Goehner P, Harris DN, Siliciano D, Mark NH, Smith R, Helman J, Tice J, Fox C, Heithaus A, Showstack J, Nicoll DC, Heineken P, Massie B, Chatterjee K, Fairley HB, Way LW, Winkelstein W. Monitoring for Myocardial Ischemia During Noncardiac SurgeryA Technology Assessment of Transesophageal Echocardiography and 12-Lead Electrocardiography. JAMA. 1992;268(2):210-216. doi:10.1001/jama.1992.03490020058031