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Objectives.. To evaluate the effects of non-invasive ventilation (NIV) with facial mask or helmet on middle ear (ME). Design.. Prospective, randomised study. Setting.. University hospital. Participants.. Ten healthy subjects randomly allocated in two groups of five subjects each. Interventions.. NIV for 1h, with helmet (group H) or facial mask (group M). Flow-triggered pressure support was 10cmH2O,...
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