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Thirty-three percent of patients had one or more postoperative adverse events or died within 30 days of admission.Mortality within 30 days of admission was 6.6%;each adverse event was associated with increased mortality(range,7.5%to 66.7%).Admission predictors of the occurrence of an adverse event included a history of bypass surgery,emergent surgery,a history of chronic obstructive pulmonary disease,the presence of an infiltrate on admission chest radiograph,a pulse of 110 meats/min or more, age,blood urea nitrogen of 10.7 mmol/L(30 mg/dL)or more,acute myocardial infarction at admission,and a history of myocardial infarction;the presence on one-or two-vessel disease was negatively associated with the occurrence of an adverse event.The model c-statistic was 0.64.Severity of illness at admission has modest predictive power with respect to adverse- event occurrence in Medicare patients who undergo bypass surgery. |
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