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Ann Thorac Surg 1992;53:988-991
© 1992 The Society of Thoracic Surgeons

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Articles

Pulmonary embolism in the cardiac surgical patient

Division of Cardiac Surgery, Johns Hopkins Hospital, Baltimore, Maryland USA

^_* Address reprint requests to Dr Cameron, Johns Hopkins Hospital, 600 N Wolfe St, Blalock 618, Baltimore, MD 21205 USA.

Pulmonary embolism (PE) is thought to occur infrequently after cardiac operations, possibly because systemic heparinization during cardiopulmonary bypass prevents deep vein thrombosis. This retrospective study was undertaken to determine the actual incidence of PE after cardiac operations and to identify risk factors. Between January 1, 1985, and December 31, 1989, 5,694 adult patients (>18 years old) had open heart operations at the Johns Hopkins Hospital. Thirty-two patients (20 men and 12 women) had PE within 60 days of operation, an overall PE incidence of 0.56%. The diagnosis of PE was established by ventilation/perfusion scan, pulmonary angiogram, or autopsy. Mortality among patients with PE was 34%. Using a case-control method, preoperative and postoperative risk factors for PE were identified by multivariate and multiple logistic regression analyses. Preoperative risk factors included bed rest (p < 0.003), prolonged hospitalization before operation (p < 0.004), and cardiac catheterization performed through the groin within 15 days before operation (p < 0.01). Postoperative risk factors were congestive heart failure (p < 0.008), prolonged bed rest (p < 0.05), and deep vein thrombosis (p < 0.03). This study demonstrates that PE is an unusual complication after cardiac operations, has a high mortality rate, and is often related to perioperative immobility and recent groin catheterization. These results also suggest that minimizing preoperative hospital stay may be important in PE prophylaxis.

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