Fig. 4. Experimental records illustrating responses to laryngeal stimulation observed in a patient managed by a Laryngeal Mask Airway™. At the points indicated by the arrows, 0.5 ml distilled water was injected onto the vocal cords. flow = airflow; Pmask= mask pressure; Psg= subglottic pressure; Petco2= end-tidal carbon dioxide tension; exp. = expiration; insp. = inspiration. Note depression of the cough reflexes after surgery.