This study aims to detect the effect of different O2 flow rates on end tidal carbon dioxide level in patients scheduled for minor gynaecological procedures under deep sedation using laryngeal mask airway. * Primary outcome was measuring end tidal carbon dioxide ( EtCO2 ) non invasively by laryngeal mask all through the procedure. * Secondary outcomes included peripheral O2 saturation, hemodynamics, time to recovery, total propofol dose, patients' satisfaction, sedation score, and complications.
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carbon dioxide monitoring
Timeframe: baseline and every 5 minutes all through the procedure