Albuterol Improves Impaired Mucociliary Clearance After Lung Transplantation

Background: Previous studies have shown that mucociliary clearance (MCC) is diminished after lung transplantation. However, it is unknown how early this deficit occurs after transplantation, or whether the abnormality can be improved by pharmacologic means. We hypothesized that impairment of MCC is evident soon after lung transplantation and that the defect in MCC can be improved by inhaled β₂-adrenergic receptor agonists. Methods: MCC and cough clearance (CC) were quantified in seven patients at 76 ± 48 days (mean ± standard deviation) after lung transplantation (baseline visit) and again 1 week later after an acute inhalation of albuterol. MCC was also determined once in four healthy subjects. To measure MCC, volunteers inhaled 99m-technetium-sulfur colloid aerosol, followed by gamma-camera imaging of their lungs for 76 minutes. Results: Baseline MCC was significantly reduced in transplant patients, compared with healthy subjects, averaging 8.9 ± 7.3% and 20.9 ± 15.1%, respectively (p = 0.05). CC was not affected by transplantation. Acute inhalation of albuterol significantly improved MCC in transplant patients (31.9 ± 21.9%) compared with baseline values (p < 0.05). Conclusions: MCC is diminished within a few months after transplantation. However, the response to albuterol suggests that the deficit is not static and can be improved with inhalation of a β₂-adrenergic receptor agonist.