The effects of age, gender, race and concomitant disease on postoperative complications.

The purpose of this study was to identify factors from simple past medical history which could alert surgeons to patients at increased risk of postoperative complications. Five hundred and fourteen patients undergoing elective surgery were studied prospectively. Factors evaluated included the patients' age, gender, race and the presence in the past medical history of coronary artery disease, congestive heart failure, cardiac dysrhythmias, respiratory disease, endocrine disease, peripheral atherosclerosis, renal disease, neuropsychiatric disease, hypertension, diabetes mellitus, prior major surgery and prior or active malignancy. All complications were recorded. The data were analysed by univariate and multivariate statistical methods. Gender, race and age were not associated with any complications. Coronary artery disease, respiratory disease, atherosclerotic peripheral vascular disease, neuropsychiatric disease, malignancy, the absence of prior major surgery, hypertension and diabetes mellitus were associated with specific postoperative complications by univariate analysis. Malignancy, diabetes mellitus, peripheral atherosclerosis, coronary artery disease, neuropsychiatric disease, renal disease and respiratory disease were independent predictors of complications as determined by multivariate analysis. Of interest is the phenomenon that the risk of postoperative complications when a combination of risk factors was present was greater than what would be predicted by the cumulative risk of these factors. This study helps identify those patients which by simple history may be at increased risk of postoperative complications and may require aggressive preoperative evaluation.