Published ahead of print on August 5, 2004, doi:10.1164/rccm.200302-165OC
Am. J. Respir. Crit. Care Med., Volume 170, Number 9, November 2004, 1022-1026
A more recent version of this article appeared on November 1, 2004
Submitted on February 10, 2003
Accepted on August 3, 2004
Association of Minimal Rejection in Lung Transplant Recipients with Obliterative Bronchiolitis
Peter M Hopkins1*, Christina L Aboyoun1, Prashant N Chhajed1, Monique A Malouf1, Marshall L Plit1, Stephen P Rainer1, and Allan R Glanville1
1 The Lung Transplant Unit, St. Vincent's Hospital, Sydney, NSW, Australia
* To whom correspondence should be addressed. E-mail: peterwakatipu{at}hotmail.com.
The clinical significance of minimal acute rejection (grade A1) in lung transplant recipients is unknown. We prospectively analysed 1159 transbronchial lung biopsies in 184 patients. Two hundred and seventy-nine biopsies in 128 participants confirmed A1 histology at a mean post-operative day of 229±340. Sixty-four of 255 surveillance A1 lesions progressed to high grade acute rejection by 3 months follow up, whilst 40 developed new lymphocytic bronchiolitis. Twenty-four A1 biopsies were symptomatic with only 2 cases progressing to high grade rejection following steroid therapy. Seventy-eight of 184 patients experienced multiple ( 2) A1 biopsies in the first 12 months post transplant. Bronchiolitis obliterans syndrome developed in 68% of patients with multiple A1 lesions at a mean of 599±435 days, compared to 43% of patients with 1 A1 lesion at a mean of 819± 526 (p=0.022). Eighteen patients experienced multiple A1 biopsies post transplant in the absence of high grade rejection episodes yet also developed earlier obliterative bronchiolitis (456±245 days, p=0.020). We conclude that for A1 transbronchial lung biopsies, the conventional treatment of observation only is now challenged even in asymptomatic patients. Patients who experience multiple A1 lesions develop earlier onset of obliterative bronchiolitis and may warrant alternative immunosuppressive strategies.
Key words: minimal rejection, lung transplant
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