Comparison of two aspiration techniques of bronchoalveolar lavage in children.

Background: Although bronchoalveolar lavage (BAL) via flexible bronchoscopy is an essential diagnostic tool, its technique is not standardized in children. Our objective was to compare two different aspiration techniques of BAL in children (continuous wall suction vs. handheld syringe suction) in regards to the percentage of fluid recovered and the odds of performing a technically acceptable procedure (i.e., >40% of volume return).

Methods: We conducted a review of all pediatric flexible bronchoscopies with BAL conducted at our institution over a 2-year period. To minimize the differences between groups at baseline and reduce the possibility of bias, we used one-to-one propensity score (PS) caliper matching with no replacement for statistical analyses.

Results: We identified 539 procedures that met pre-specified criteria. There were considerable covariate imbalances between procedures in the handheld syringe group (n = 147) and those in the continuous wall group (n = 392); however, these imbalances were substantially reduced after the PS matching. In the matched sample (n = 236), children in the handheld syringe group had ∼7% higher volume return (95% CI = 3.4-11.0, P < 0.001) from BAL and threefold higher odds (95% CI = 1.5-8.6, P = 0.002) of performing a technically acceptable procedure.

Conclusions: Our results suggest that handheld syringe suction offers a higher percentage of volume return from BAL and increases the odds of performing a technically acceptable procedure in children when compared to continuous wall suction.