Study on Suction Pressure and Bronchoalveolar Lavage Recovery
Background
Bronchoalveolar lavage (BAL) is an important diagnostic method. For effective diagnosis, a recovery rate of at least 30% is ideal. However, bronchial collapse due to negative suction pressure can hinder recovery. This study investigates how suction pressure levels during bronchial obstruction affect BAL recovery rates.
Methods
We studied 103 patients who had BAL procedures at Fukujuji Hospital between May 2024 and July 2025. We compared suction pressure levels in patients with recovery rates below 30% (failure group) to those with recovery rates of 30% or higher (success group).
Results
Out of 103 patients, 13 were in the failure group and 90 in the success group. The average age in the failure group was 74 years, while it was 72 years in the success group. Patients in the failure group had lower suction pressure levels during bronchial obstruction (8 hPa) compared to the success group (10 hPa). A suction pressure level below 9.5 hPa was identified as a predictor for BAL recovery failure, with 67.8% sensitivity and 92.3% specificity.
Conclusion
Lower suction pressure levels during bronchial obstruction can predict BAL recovery failure, indicating that a weak bronchial wall is more likely to collapse under suction pressure.
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