Am. J. Respir. Crit. Care Med., Vol 154, No. 5, Nov 1996, 1468-1472.
Clinical predictors of tuberculosis as a guide for a respiratory isolation policy
NN Bock, JE McGowan Jr, J Ahn, J Tapia and HM Blumberg
Department of Medicine, Emory University School of Medicine, Grady Memorial Hospital, Atlanta, Georgia, USA.
An expanded respiratory isolation policy was implemented in a public
hospital that cares for about 200 patients with active tuberculous each
year. This led to proper isolation of > or = 95% of patients with
tuberculosis on admission but involved an 8-fold overuse of isolation
rooms. We developed a model policy to decrease overisolation of
nontuberculous patients. Clinical findings in 295 patients admitted to
respiratory isolation during a 3-mo period were evaluated for their
usefulness in determining which patients had tuberculosis. Multivariate
analysis identified five predictive variables: chest radiograph with upper
lobe infiltrate (odds ratio, 5.00; CI, 2.38 to 10.51; p = 0.001) or cavity
(odds ratio, 3.93; CI, 1.06 to 14.62; p = 0.041), history of having known
someone with tuberculosis (odds ratio, 2.42; CI, 1.10 to 5.32, p = 0.027),
self-reported positive tuberculin skin test (odds ratio, 5.67; CI, 1.57 to
22.01; p = 0.009), self-reported isoniazid preventive therapy (odds ratio,
0.18; CI, 0.04 to 0.82; p = 0.027). Using these variables to determine
which patients required isolation would have decreased the number of
isolated nontuberculous patients from 253 to 95, but it would have missed
eight of 42 patients with tuberculosis. Further work is needed to identify
clinical predictors that would decrease overuse of isolation beds while
maintaining satisfactory sensitivity for patients with tuberculosis.
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Copyright © 1996 American Thoracic Society
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