ABSTRACT
Fiberoptic bronchoscopy remains the gold standard to establish the presence or absence
of acute pulmonary allograft rejection or infection after lung transplantation (LT).
Performance of clinically mandated transbronchial lung biopsy enhances diagnostic
precision and has a satisfactory risk:benefit ratio in experienced hands. Surveillance
transbronchial biopsies have a lower yield but may provide longitudinal insight into
immunological events in the allograft that can assist long-term management. Moreover,
knowledge about the structural integrity of the bronchial anastomosis is critical
to achieve optimum outcomes. Obliterative bronchiolitis (OB) is the most common cause
of late graft dysfunction and mortality after LT. Significant OB is invariably associated
with reduced graft function, denoted physiologically by the bronchiolitis obliterans
syndrome (BOS). Importantly, not all BOS is due to OB. The major risk factor for BOS
is thought to be acute cellular rejection but new data support an important role for
lymphocytic bronchiolitis. This review examines the role of fiberoptic bronchoscopy
after LT as a surveillance tool and discusses indications, risk:benefit, and outcomes,
with emphasis on two specific findings on biopsy; namely, minimal acute cellular rejection
and lymphocytic bronchiolitis. Findings on follow-up biopsies to assess the outcome
of therapies and the natural history of untreated “minimal” rejection events are also
discussed.
KEYWORDS
Lung transplantation - bronchoscopy - monitoring
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Allan R GlanvilleM.D. F.R.A.C.P.
The Lung Transplant Unit, Xavier 4, St. Vincent's Hospital, Victoria St., Darlinghurst,
Sydney
NSW 2010, Australia
eMail: aglanville@stvincents.com.au