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Improved Survival of Burned Patients With Inhalation Injury

Loring W. Rue III, MC, USA; MAJ William G. Cioffi, MC, USA; Arthur D. Mason, MD; COL William F. McManus, MC, USA; COL Basil A. Pruitt Jr, MC, USA
Arch Surg. 1993;128(7):772-780. doi:10.1001/archsurg.1993.01420190066009.
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Objective:  To study a cohort of patients treated at the same institution and to compare that patient population with that of a previous report documenting the comorbidity of inhalation injury and pneumonia. Specifically, we wanted to determine whether there had been an improvement in survival of patients suffering inhalation injury.

Design:  A retrospective review.

Setting:  The US Army Institute of Surgical Research, Ft Sam Houston, Tex, a 40-bed burn intensive care referral unit.

Subjects:  One thousand two hundred fifty-six thermally injured patients treated between January 1985 and December 1990.

Main Outcome Measure:  A comparison of pneumonia frequency and ultimate survival of the current cohort of patients as compared with a previously generated stepwise logistic analysis predicting mortality on the basis of 1980 to 1984 patient data.

Results:  Of 1256 burned patients admitted between 1985 and 1990, there were 330 identified as having inhalation injury. These patients were older (35.0 vs 26.6 years) and had more extensive burns (41.1% vs 18.3%) and a higher mortality (29.4% vs 5.0%) than did the patients without inhalation injury. When compared with a mortality predictor generated from 1980 through 1984 patient data, patients in the most recent period had a lower mortality than predicted (29.4% vs 41.4%). Patients with less severe injury (positive xenon scan, negative results of bronchoscopy; n=85), although having a similar incidence of pneumonia (13.1% vs 19.5%) as the same group from 1980 through 1984, accounted for the most improvement in survival. The 3.6% mortality was significantly less than the predicted rate of 15.7%. Patients with positive results of bronchoscopy (n=245) also showed some improvement in outcome from that predicted (38.3% vs 50.2%) despite no change in the rate of pneumonia (46.9% vs 48.5%). Further improvement in survival was realized in those patients supported with high-frequency ventilation. Although their age (33.9 vs 36.3 years), burn size (46.0% vs 45.5%), and duration of intubation (16.8 vs 15.1 days) were similar to those of conventionally treated patients, mortality was significantly less than predicted (16.4% vs 40.9%) and less than that in patients treated with conventional ventilation (16.4% vs 42.7%).

Conclusions:  The improvement in survival of patients with inhalation injury represents the aggregate effects of the general improvement and outcome of all burned patients, the prevention of pneumonia by high-frequency ventilation, and the reduced mortality from the pneumonias that did occur.(Arch Surg. 1993;128:772-780)


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