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The Annals of Thoracic Surgery, Vol 52, 1295-1299, Copyright © 1991 by The Society of Thoracic Surgeons

ARTICLES

Denervation of transplanted porcine lung causes airway obstruction

CE Hobson, WG Teague, CG Tribble, SE Mills, B Chan, J Agee, TL Flanagan and IL Kron
Department of Surgery, University of Virginia School of Medicine, Charlottesville.

Lung transplantation can be complicated by a form of small airway obstruction known as bronchiolitis obliterans. We tested the hypothesis that lung denervation causes small airway obstruction in young pigs (10 +/- 1 weeks). Control pigs had an innervated native lobe, and study pigs had either a denervated native lobe or a denervated transplant lobe. Transplanted pigs received standard immunosuppression. At 10 weeks we measured isolated left lobe pulmonary mechanics. Dynamic resistance in both study groups was significantly higher than in the lobectomy group, whereas dynamic compliance in both study groups was significantly lower than in the lobectomy group. No significant difference in resistance or compliance was noted between the transplant and reimplant groups. Histologic changes consistent with rejection were noted in the transplant lobes. We conclude that the small airway obstruction noted in this model is due to operative denervation rather than to immunosuppression or rejection.

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