Predictors of Cardiac Events After Major Vascular Surgery

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Abstract
Research from JAMA — Predictors of Cardiac Events After Major Vascular Surgery — Role of Clinical Characteristics, Dobutamine Echocardiography, and β-Blocker Therapy — ContextPatients who undergo major vascular surgery are at increased risk of perioperative cardiac complications. High-risk patients can be identified by clinical factors and noninvasive cardiac testing, such as dobutamine stress echocardiography (DSE); however, such noninvasive imaging techniques carry significant disadvantages. A recent study found that perioperative β-blocker therapy reduces complication rates in high-risk individuals.ObjectiveTo examine the relationship of clinical characteristics, DSE results, β-blocker therapy, and cardiac events in patients undergoing major vascular surgery.Design and SettingCohort study conducted in 1996-1999 in the following 8 centers: Erasmus Medical Centre and Sint Clara Ziekenhuis, Rotterdam, Twee Steden Ziekenhuis, Tilburg, Academisch Ziekenhuis Utrecht, Utrecht, and Medisch Centrum Alkmaar, Alkmaar, the Netherlands; Ziekenhuis Middelheim, Antwerp, Belgium; and San Gerardo Hospital, Monza, Istituto di Ricovero e Cura a Carattere Scientifico, San Giovanni Rotondo, Italy.PatientsA total of 1351 consecutive patients scheduled for major vascular surgery; DSE was performed in 1097 patients (81%), and 360 (27%) received β-blocker therapy.Main Outcome MeasureCardiac death or nonfatal myocardial infarction within 30 days after surgery, compared by clinical characteristics, DSE results, and β-blocker use.ResultsForty-five patients (3.3%) had perioperative cardiac death or nonfatal myocardial infarction. In multivariable analysis, important clinical determinants of adverse outcome were age 70 years or older; current or prior angina pectoris; and prior myocardial infarction, heart failure, or cerebrovascular accident. Eighty-three percent of patients had less than 3 clinical risk factors. Among this subgroup, patients receiving β-blockers had a lower risk of cardiac complications (0.8% [2/263]) than those not receiving β-blockers (2.3% [20/855]), and DSE had minimal additional prognostic value. In patients with 3 or more risk factors (17%), DSE provided additional prognostic information, for patients without stress-induced ischemia had much lower risk of events than those with stress-induced ischemia (among those receiving β-blockers, 2.0% [1/50] vs 10.6% [5/47]). Moreover, patients with limited stress-induced ischemia (1-4 segments) experienced fewer cardiac events (2.8% [1/36]) than those with more extensive ischemia (≥5 segments, 36% [4/11]).ConclusionThe additional predictive value of DSE is limited in clinically low-risk patients receiving β-blockers. In clinical practice, DSE may be avoided in a large number of patients who can proceed safely for surgery without delay. In clinically intermediate- and high-risk patients receiving β-blockers, DSE may help identify those in whom surgery can still be performed and those in whom cardiac revascularization should be considered.

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