The purpose of this study was to compare the Oxylator EM-100, a ventilator with a fixed flow and working pressure of 25 to 50 cm H(2)O, with a bag-valve device with respect to safety, efficiency, and efficacy when used by professionals. We conducted a prospective, controlled, caregiver-blind single center study. Induction was followed by ventilation with a bag-valve device oxylator in manual and automatic modes. Steps were repeated under hypnosis, after muscle relaxation with mask, and with an endotracheal tube. Forty patients, aged 48.8 +/- 13.5 years weighing 50 to 111 kg were studied.