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Bronchoalveolar lavage causes decrease in PaO2, increase in (A-a) gradient value and bronchoconstriction in

A Spanevello1, G B Migliori, A Satta

  • 1Division of Pneumology, Fondazione Salvatore Maugeri, Clinica del Lavoro e della Riabilitazione, Care and Research Institute, Tradate, Italy.

Respiratory Medicine
|June 9, 1998
PubMed
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Bronchoalveolar lavage (BAL) causes significant decreases in arterial oxygen and lung function in both asthmatic and healthy individuals. Asthmatics experience more severe hypoxemia and a greater decline in forced expiratory volume in 1 second (FEV1) after BAL.

Area of Science:

  • Pulmonology
  • Respiratory Medicine
  • Clinical Investigation

Background:

  • Bronchoalveolar lavage (BAL) is a diagnostic procedure used in respiratory medicine.
  • Asthma is a chronic inflammatory airway disease characterized by variable symptoms and airflow obstruction.
  • The physiological effects of BAL on gas exchange and lung function in asthmatic patients require thorough investigation.

Purpose of the Study:

  • To quantify changes in arterial oxygen partial pressure (PaO2), arterial carbon dioxide partial pressure (PaCO2), hemoglobin oxygen saturation (SaO2), and alveolar-arterial oxygen gradient following BAL.
  • To assess alterations in forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) post-BAL.
  • To identify predictors of hypoxemia and spirometric impairment resulting from BAL in asthmatics and healthy subjects.

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Main Methods:

  • Bronchoscopy with 150 ml BAL was performed on 24 asthmatics and 15 healthy subjects.
  • Serial arterial blood gas analysis (PaO2, PaCO2, SaO2) was conducted at multiple time points before, during, and up to 24 hours after BAL.
  • Spirometry (FEV1, FVC) was measured immediately before and 5 minutes after the bronchoscopy procedure.

Main Results:

  • Both asthmatic and healthy groups exhibited a significant decrease in PaO2 and widening of the alveolar-arterial oxygen gradient post-BAL.
  • Asthmatic subjects experienced a more pronounced reduction in PaO2 compared to healthy subjects.
  • Asthmatics showed significant decreases in FEV1, FVC, and FEV1/FVC ratio, with a notably greater fall in FEV1 (32.4%) than in healthy subjects (17.7%).

Conclusions:

  • BAL induces significant hypoxemia and spirometric impairment in both asthmatic and healthy individuals.
  • Asthmatic patients are more susceptible to severe hypoxemia and greater FEV1 reduction following BAL.
  • Increased caution and meticulous monitoring are strongly recommended when performing BAL in individuals with asthma.