Thirty patients with a laryngeal polyp or other tumour, were operated on under the microscope. During the operation, which lasted from 10 to 30 minutes, ventilation was ensured by injection of oxygen at 3 to 4 atmospheric pressures through a naso-tracheal catheter. Anaesthesia was obtained by an association of propanidide, small doses of analgesic and succinycholine, constant rate syringes were used for maintenance of narcosis and curarisation. In 23 patients, blood gases were analysed at various stages of the operation permitting one to assess the quality of the ventilation carried out. In a few patients, it was also possible to record pressure curves in the trachea. The results were excellent, both concerning the quality of the ventilation and that of the anaesthesia together with the operative conditions. After recalling the main characteristics of this mode of ventilation which uses Venturi's principle, the authors expose the other methods which are variants compared with their technique of use of this procedure for laryngeal micro-surgery.
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