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Background  There is a need for non-invasive parameters that are sensitive to the development of the bronchiolitis obliterans syndrome (BOS) in lung transplantation (LTx) patients. We studied whether the pulmonary diffusing capacity for inhaled nitric oxide is capable of detecting BOS stages.    Methods  Sixty-one LTx patients were included into this cross-sectional study (19/29/7/3/3 in BOS stages 0/0-p/1/2/3). For analysis stages 0/0-p versus 1/2/3 (“BOS binary-early”), and stages 0/0-p/1 versus 2/3 (“BOS binary-late”) were summarized. Measurements of the combined diffusing capacity for nitric oxide (DLNO) and carbon monoxide (DLCO) were compared with spirometry and bodyplethysmography, and their relative importance was evaluated by discriminant analysis.    Results  Regarding the recognition of “BOS binary-early”, among spirometric parameters forced expiratory volume in 1 s (FEV 1 ) was best, among bodyplethysmographic parameters airway resistance, and among diffusing parameters DLNO. Regarding “BOS binary-late”, DLNO was inferior to bodyplethysmographic parameters.    Conclusion  Although the study comprised only measurements at a single time point and no follow-up, DLNO outperformed FEV 1 , the time course of which is used in detecting BOS. Together with its pathophysiological plausibility, this result suggests that the measurement of DLNO, possibly over time, could be an easily applicable tool for the monitoring of LTx patients and should be evaluated in larger studies.

Combined diffusing capacity for nitric oxide and carbon monoxide as predictor of bronchiolitis obliterans syndrome following lung transplantation