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During 12 controlled experiments 87 untrained rescuers performed the mouth-to-airway method on anesthetized and curarized adults. Volumes of tidal air greater than 1,500 ml. could be moved by the mouth-to-airway method in all victims. The mouth-to-airway method, as well as the mouth-to mouth method, permits a breath-to-breath evaluation and control of the efficacy of ventilation, since the rescuer can observe the patient's chest at all times and can listen to the expiratory gas flow while at the same time he has both hands free for extending the head and supporting the jaw, thus maintaining a patent upper airway.
Peter Šafář (Sat,) studied this question.