Objective Estimates of the Probability of Death from Burn Injuries
Colleen M. Ryan, M.D., David A. Schoenfeld, Ph.D., William P. Thorpe, Ph.D., Robert L. Sheridan, M.D., Edwin H. Cassem, M.D., and Ronald G. Tompkins, M.D., Sc.D.
Background Over the past 20 years, there has been remarkableimprovement in the chances of survival of patients treated inburn centers. A simple, accurate system for objectively estimatingthe probability of death would be useful in counseling patientsand making medical decisions.
Methods We conducted a retrospective review of all 1665 patientswith acute burn injuries admitted from 1990 to 1994 to MassachusettsGeneral Hospital and the Shriners Burns Institute in Boston.Using logistic-regression analysis, we developed probabilityestimates for the prediction of mortality based on a minimalset of well-defined variables. The resulting mortality formulawas used to determine whether changes in mortality have occurredsince 1984, and it was tested prospectively on all 530 patientswith acute burn injuries admitted in 1995 or 1996.
Results Of the 1665 patients (mean [±SD] age, 21±20years; mean burn size, 14±20 percent of body-surfacearea), 1598 (96 percent) lived to discharge. The mean lengthof stay was 21±29 days. Three risk factors for deathwere identified: age greater than 60 years, more than 40 percentof body-surface area burned, and inhalation injury. The mortalityformula we developed predicts 0.3 percent, 3 percent, 33 percent,or approximately 90 percent mortality, depending on whetherzero, one, two, or three risk factors are present. The resultsof the prospective test of the formula were similar. A largeincrease in the proportion of patients who chose not to be resuscitatedcomplicated comparisons of mortality over time.
Conclusions The probability of death after burns is low andcan be predicted soon after injury on the basis of simple, objectiveclinical criteria.
Source Information
From the Shriners Burns Institute and the Sumner Redstone Burn Center (C.M.R., W.P.T., R.L.S., R.G.T.); the Massachusetts General Hospital Biostatistics Center (D.A.S.); and the Surgery (C.M.R., W.P.T., R.L.S., R.G.T.), Medicine (D.A.S.), and Psychiatry (E.H.C.) Services, Massachusetts General Hospital and Harvard Medical School all in Boston.
Address reprint requests to Dr. Tompkins at Trauma and Burn Services, Massachusetts General Hospital, Bigelow 1302, Boston, MA 02114.
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