Preoperative Evaluation and Management Before Major Noncardiac Surgery
There are more than 10 million major noncardiac surgical procedures performed in the United States per year, and this number is expected to grow as the population ages. The problem of perioperative cardiac events among patients undergoing noncardiac surgery is significant. The estimated risk of myocardial infarction (MI) in patients undergoing noncardiac surgery is 1.1% among unselected patients and 3.1% among patients at elevated risk of cardiac disease. The task of the internist providing preoperative evaluation of patients is not to provide medical “clearance.” Instead, the role of the internist is, in addition to answering any specific questions posed by the requesting physician, to provide a thorough assessment of the patient's cardiovascular and other risks for the procedure. This risk assessment can assist in the balancing of risks and benefits that influences whether the surgeon decides to go forward with the procedure. The consulting internist must also provide specific suggestions regarding further testing that may be indicated for preoperative risk stratification and, most importantly, recommendations for measures that can be taken to mitigate the identified risks.