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Published ahead of print on January 6, 2006, doi:10.1164/rccm.200510-1609OC
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American Journal of Respiratory and Critical Care Medicine Vol 173. pp. 917-921, (2006)
© 2006 American Thoracic Society
doi: 10.1164/rccm.200510-1609OC


Original Article

Immunoglobulin G Levels before and after Lung Transplantation

Natalie H. Yip, David J. Lederer, Steven M. Kawut, Jessie S. Wilt, Frank D'Ovidio, Yuanjia Wang, Edward Dwyer, Joshua R. Sonett and Selim M. Arcasoy

Departments of Medicine and Surgery, College of Physicians and Surgeons; Department of Epidemiology, Mailman School of Public Health; and Department of Statistics, Columbia University, New York, New York

Correspondence and requests for reprints should be addressed to Selim M. Arcasoy, M.D., Division of Pulmonary, Allergy, and Critical Care Medicine, 622 West 168th Street, PH 14, Room 104, New York, NY 10032. E-mail: sa2059{at}columbia.edu

Rationale: The determinants of immunoglobulin G (IgG) level and the risk of hypogammaglobulinemia (HGG) in patients with severe lung disease before and after lung transplantation are unknown.

Objectives: We aimed to identify predictors of low IgG levels before and after lung transplantation.

Methods: We performed a retrospective cohort study of 40 consecutive lung transplant recipients at our center. Total IgG levels were measured before and serially after transplantation. Mild HGG was defined as IgG levels from 400–699 mg/dl; severe HGG was defined as IgG levels < 400 mg/dl.

Measurements and Main Results: Before transplantation, six (15%) patients had mild HGG, and none had severe HGG. Patients with chronic obstructive pulmonary disease had lower IgG levels compared with patients with other diseases (independent of corticosteroid use and age; p = 0.001) and an increased risk of mild HGG (p = 0.005). The cumulative incidences of mild and severe HGG significantly increased after transplantation (58 and 15%, respectively, both p < 0.04 compared with pretransplant prevalences). Lower pretransplant IgG level and treatment with mycophenolate mofetil were associated with lower IgG levels after transplantation (both p < 0.05). Only lower pretransplant IgG levels were significantly associated with an increased risk of severe HGG after transplantation (p = 0.02).

Conclusions: Mild HGG is common in patients with severe chronic obstructive pulmonary disease, and the incidences of mild and severe HGG increase significantly early after lung transplantation. Baseline IgG levels and treatment with mycophenolate mofetil affect post-transplant IgG levels.

Key Words: hypogammaglobulinemia • immunosuppression • infection • lung transplantation




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