Risk factors for oxygen desaturation during and after tracheobronchial foreign body removal in children

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Objective To determine the risk factors for oxygen desaturation during and after tracheobrenchial foreign body removal in children. Methods Three hundred and one emergency airway foreign body (FB) removals were performed in children from February 2007 to October 2008. Predictive factors for the development of O2 desaturation during and after operation were analyzed. O2 desaturation was defined as SpO2 5 s. Preoperative complications, persistence, type and location of FB, ventilation mode, body movement at the insertion of bronchoscope, the depth of anesthesia at withdrawal of bronchoscope, duration of operation, duration of emergence phase, occurrence of postoperative laryngospasm and intra- and postoperative O2 desaturation were recorded. Univariate analysis and multivariate logistic regression analysis were used to examine the relationship between these factors and intra- and postoperative O2 desaturation. Results The incidence of O2 desaturation was 20.4% and 12.2% during and after the procedure respectively. Multivariate logistic regression analysis identified that preoperative pneumonia, ventilation mode, the type of FB and duration of operation were significant predictors for intraoperative O2 desaturation while the type of FB and duration of emergence phase were the significant predictors for postoperative O2 desaturation. Conclusion Preoperative pneumonia, ventilation mode, the type of FB and duration of operation were significant predictors for intraoperative O2 desaturation while the type of FB and duration of emergence phase were the significant predictors for postoperative O2 desaturation. Key words: Trachea; Foreign bodies; Child; Risk factors; Oxygen desaturation