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Volume 43, Number 1, February 2010

Evaluation of Immunoglobulin Levels and Infection Rate in Patients with Common Variable Immunodeficiency After Immunoglobulin Replacement Therapy

Mahin Salehzadeh, Asghar Aghamohammadia, Nima Rezaeia

Received: February 5, 2009    Revised: February 25, 2009    Accepted: March 25, 2009   


Corresponding author:

Children’s Medical Center, 62 Qarib Street, Keshavarz Boulevard, Tehran 14194, Iran.  geneous group of primary immunodeficiency diseases char-acterized by hypogammaglobulinemia and an increased  

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Background and purpose: 

Common variable immunodeficiency (CVID) is characterized by decreased serum levels of IgG and increased susceptibility to recurrent infections. The aim of this study was to evaluate the IgG subclass levels of CVID patients.



Twenty-four CVID patients who had been under regular intravenous immunoglobulin replacement therapy for 96.13 ± 54.83 months were enrolled in this study. Serum IgG and IgG subclass levels, and clinical outcomes for these patients were evaluated after this period of treatment.



 Mean serum IgG levels were significantly increased from 272.91 ± 185.58 mg/dL at the time of diagnosis to 455.29 ± 200.23 mg/dL after treatment, while there was no significant difference in the serum levels of IgM and IgA. Decreased serum levels of IgG1 were detected in 75% of the patients studied. Decreased serum levels of IgG2, IgG3 and IgG4 were also detected in 6, 11, and 11 patients, respectively. All patients experienced recurrent infectious diseases either before, or after, diagnosis.




Although serum IgG levels in the patients significantly increased after regular intravenous immunoglobulin replacement therapy, serum IgM and IgA levels remained diminished over time. Furthermore, a number of cases had low levels of IgG subclasses, in spite of normal total IgG levels, which could explain why some patients had continued infections, even after immunoglobulin replacement therapy. 



Key words:

common variable immunodeficiency, immunoglobulin, IgG subclasses, infection Introduction Common variable immunodeficiency (CVID) is a hetero-