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Previous Volume 348:229-235 January 16, 2003 Number 3 Next

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ABSTRACT

Background Risk factors for medical errors remain poorly understood. We performed a case–control study of retained foreign bodies in surgical patients in order to identify risk factors for this type of error.

Methods We reviewed the medical records associated with all claims or incident reports of a retained surgical sponge or instrument filed between 1985 and 2001 with a large malpractice insurer representing one third of the physicians in Massachusetts. For each case, we identified an average of four randomly selected controls who underwent the same type of operation during the same six-month period.

Results Our study included 54 patients with a total of 61 retained foreign bodies (of which 69 percent were sponges and 31 percent instruments) and 235 control patients. Thirty-seven of the patients with retained foreign bodies (69 percent) required reoperation, and one died. Patients with retained foreign bodies were more likely than controls to have had emergency surgery (33 percent vs. 7 percent, P<0.001) or an unexpected change in surgical procedure (34 percent vs. 9 percent, P<0.001). Patients with retained foreign bodies also had a higher mean body-mass index and were less likely to have had counts of sponges and instruments performed. In multivariate analysis, factors associated with a significantly increased risk of retention of a foreign body were emergency surgery (risk ratio, 8.8 [95 percent confidence interval, 2.4 to 31.9]), unplanned change in the operation (risk ratio, 4.1 [95 percent confidence interval, 1.4 to 12.4]), and body-mass index (risk ratio for each one-unit increment, 1.1 [95 percent confidence interval, 1.0 to 1.2]).

Conclusions The risk of retention of a foreign body after surgery significantly increases in emergencies, with unplanned changes in procedure, and with higher body-mass index. Case –control analysis of medical-malpractice claims may identify and quantify risk factors for specific types of errors.

Source Information

From the Departments of Surgery (A.A.G., M.J.Z.) and Medicine (E.J.O., T.A.B.), Brigham and Women's Hospital; and the Department of Health Policy and Management, Harvard School of Public Health (A.A.G., D.M.S., T.A.B.) — both in Boston.

Address reprint requests to Dr. Gawande at the Department of Surgery, Brigham and Women's Hospital, 75 Francis St., Boston, MA 02115.

Full Text of this Article

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Risk Factors for Retained Instruments and Sponges after Surgery
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N Engl J Med 2003; 348:1724-1725, Apr 24, 2003. Correspondence

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