Perioperative risk of noncardiac surgery associated with aortic stenosis.

The perioperative risk of noncardiac surgery in patients with aortic stenosis (AS) remains ill-defined, and the few studies published have reported conflicting results. A sample of patients from the National Hospital Discharge Survey database diagnosed with AS who underwent any noncardiac surgical procedure was searched. Patients who underwent any cardiac surgery were excluded. Patients with AS were matched by decile of age and surgical risk for twice as many controls. A discharge diagnosis of acute myocardial infarction (AMI) and death was used as the end points for analysis. From 1996 to 2002, 5,149 patients with a diagnosis of AS had undergone noncardiac surgery and were matched with 10,284 controls. The incidence of AMI was greater in patients with AS than in controls (3.86% vs 2.03%, p <0.001). After correcting for gender and the presence of coronary artery disease, hypertension, and diabetes mellitus in a multivariate logistic regression model, the presence of AS was associated with an increased likelihood of AMI (odds ratio 1.55, 95% confidence interval 1.27 to 1.90, p <0.001). There was no significantly increased risk for death in patients with AS versus controls. In the era of more intense perioperative medical management of patients who undergo noncardiac surgery, the presence of AS increases the risk for perioperative AMI but not overall mortality. The impact of the actual severity of AS on outcomes with noncardiac surgery needs further study.