title: Changes in lung vascular permeability after heart-lung transplantation.
abstract: We have employed multiple indicator dilution techniques (MID) in six patients after heart-lung transplantation to assess changes in the lung vascular permeability-surface area product for urea (PS). Serial PS values for the patients when normalized to the predicted total lung capacity (TLC) in liters, ranged between 1.04 and 6.27 ml/sec/TLC (patient 1), 0 and 2.76 ml/sec/TLC (patient 2), 0.59 and 2.88 ml/sec/TLC (patient 3), 0.13 and 1.23 ml/sec/TLC (patient 4). The elevated values for PS in patient 1 exceed the lethal range described by K.L. Brigham et al. (J. Clin. Invest. 72:339, 1983) for severe ARDS. This strongly suggests a severely increased lung microvascular permeability in this patient possibly secondary to rejection as indicated by endomyocardial biopsy. PS values for surviving patients 2-6 fell well below the corresponding lethal value for ARDS patients. We conclude that PS urea derived from MID provides an indicator of the status of lung microvascular integrity in heart-lung transplant recipients.
mesh_terms: D002199:Capillary Permeability; D016027:Heart Transplantation; D016041:Heart-Lung Transplantation; D006801:Humans; D007201:Indicator Dilution Techniques; D016040:Lung Transplantation; D011652:Pulmonary Circulation; D014109:Total Lung Capacity; D014508:Urea
chemical_list: D014508:Urea