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J Appl Physiol 68: 2542-2549, 1990;
8750-7587/90 $5.00
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Journal of Applied Physiology, Vol 68, Issue 6 2542-2549, Copyright © 1990 by American Physiological Society

ARTICLES

Tumor necrosis factor's effects on lung mechanics, gas exchange, and airway reactivity in sheep

A. P. Wheeler, G. Jesmok and K. L. Brigham
Department of Medicine, Vanderbilt University, Nashville, Tennessee 37232.

The macrophage- and monocyte-produced cytokine tumor necrosis factor alpha (TNF alpha) has been proposed as a major mediator of endotoxin-induced injury. To determine if TNF alpha could reproduce the effects of endotoxin on the lung, we intravenously administered 10 micrograms/kg of human recombinant TNF alpha into five chronically instrumented unanesthetized sheep on two occasions to characterize the TNF alpha response and its reproducibility. We assessed changes in lung mechanics, pulmonary and systemic hemodynamics, gas exchange, and the number and type of peripheral blood leukocytes. We also determined airway reactivity by use of aerosolized histamine before and after TNF alpha infusion. Pulmonary arterial pressure (Ppa) peaked within 30 min of initiating the TNF alpha infusion [47.7 +/- 2.2 vs. 15.9 +/- 0.4 (SE) cmH2O at base line] and then returned toward base line over 4 h. There was a brief decline in left atrial pressure after TNF alpha. Pulmonary hypertension was accompanied by leukopenia, neutropenia, and increases in the alveolar-arterial O2 difference (AaDO2). Dynamic lung compliance (Cdyn) declined after TNF alpha, reaching a nadir within 15 min of the initiation of the TNF alpha infusion [0.045 +/- 0.007 vs. 0.093 +/- 0.007 (+/- SE) l/cmH2O at base line]. Resistance to airflow across the lung (RL) increased from 1.2 +/- 0.2 cmH2O.l-1.s at base line, peaking at 5.4 +/- 1.3 cmH2O.l-1.s 30 min after the start of the TNF alpha infusion. Alterations in Cdyn and RL persisted for 4 h.(ABSTRACT TRUNCATED AT 250 WORDS)


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