In this trial the investigators will evaluate blood flow in common carotid artery of healthy subjects treated with Continuous Positive Airway Pressure (CPAP) Ventilation, comparing two different devices: oronasal mask versus Helmet. The hypothesis is that Helmet CPAP reduces carotid flow compared to oronasal mask.
Age range
18 Years
Sex
ALL
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Common carotid artery flow
Timeframe: 4 consecutive heart beats at the end of the intervention