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Chest, Vol 97, 1360-1366, Copyright © 1990 by American College of Chest Physicians

ARTICLES

Bronchial responsiveness after human heart-lung transplantation

AR Glanville, J Theodore, JC Baldwin and ED Robin
Department of Medicine, Stanford University School of Medicine, Calif.

We evaluated bronchial responsiveness to inhaled albuterol (salbutamol), ipratropium bromide, methacholine, and propranolol in eight heart-lung transplant (HLT) recipients 2.3 +/- 1.5 months (mean +/- SD) (range, 1 to 4.5 months) after HLT. All patients had a restrictive ventilatory defect but none had airflow limitation (FEV1/FVC = 0.93 +/- 0.05) (range, 0.86 to 0.97). Specific airway conductance (sGaw) improved significantly with both albuterol (p less than 0.01) and ipratropium bromide (p less than 0.01) but FEV1 did not. Only one HLT patient had bronchoconstriction with propranolol, whereas all but one were hyperresponsive to methacholine. Prior inhalation of ipratropium bromide blocked the response to methacholine (p less than 0.005). Serial methacholine provocation tests performed in seven long- term survivors of HLT 24.6 +/- 16.0 months (range, 12 to 51 months) after HLT revealed no time-dependent evolution of bronchial hyperresponsiveness to methacholine. Limited maximal airway narrowing to methacholine was seen in five HLT recipients who showed a 29 +/- 4 percent (range, 23 to 35 percent) fall in FEV1 compared with two patients who did not achieve a plateau with a 47 percent and 63 percent fall in FEV1, respectively. These results further our understanding of bronchial responsiveness in the denervated transplanted lung. The findings of stable hyperresponsiveness to methacholine over a prolonged time interval, limited maximal airway narrowing to methacholine, and blockade of methacholine hyperresponsiveness by ipratropium bromide support the concept of denervation hypersensitivity of muscarinic receptors.


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