Ventilatory adequacy and respiratory mechanics with laryngeal mask versus tracheal intubation during positive pressure ventilation.

The ventilatory adequacy and respiratory mechanics during positive pressure ventilation (PPV) via the laryngeal mask airway (LMA) are compared with the respiratory mechanics via the tracheal tube (TT). Thirty patients undergoing breast surgery were studied. After induction of anesthesia and muscle relaxation an LMA was inserted.