Direct Laryngoscopy under Non-intubation Oxygen jet Method Combined with Neuroleptoananalgesia (NLA)

Abstract

Direct laryngoscopy under NLA without intratracheal intubation is useful for observing the vocal cord movements during patients' phonation, for easy insertion of the scope and for excellent visualization of the larynx.
However, prolonged surgery is not feasible owing to occasional suppression of breathing by NLA. We deviced a new technique of Non-intubation Oxygen jet method. A small tube was attached to the conventional scope. Once a patient was sedated, muscle relaxant was administered. Oxygen jet was injected into the trachea via the above mentioned tube, which was connected to Oxygen source, by controlling a flush valve of a anesthesia machine.
Arterial Po₂ and Pco₂ levels were satisfactory during laryngomicrosurgery.