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the correlation between the %CSA<5 and the radionuclide uptake rate visualized by pulmonary perfusion scintigraphy.Results: The %CSA<5 in the obstructed side of the lung after treatment displayed significant improvements after intervention (p = 0.04). Among the 5 cases that underwent pulmonary perfusion scintigraphy before and after the treatment, the radionuclide uptake rate of the obstructed side improved in all patients, whereas the %CSA<5 improved in 4 of the 5 patients.Conclusion: Measurement of the %CSA<5 might be useful to assess the outcome of interventional bronchoscopy. AP384Background and Aim: The diagnostic bronchoscopy in acute hypoxemic patients might result in profound hypoxemia requiring intubation. We aimed to study the effectiveness of non-invasive ventilation (NIV) compared with high-flow nasal cannula (HFNC) in those patients requiring the diagnostic bronchoscopy. The primary end point was the lowest oxygen saturation during the procedure.

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