The value of capnography during jet ventilation for suspension laryngoscopy.

A self made connection device with an injector of 1.5 mm in diameter and connections for the measurements of the end tidal CO2 (Datascope 500 CO2 Analyzer), expired tidal and minute volumen (Dr¿ger Spirolog), and armoured tracheal tube nr. 22 with cuff (Rüsch), has been used in 25 unselected patients submitted to diagnostic laryngoscopy. The patients have been ventilated with Wolf Injectomat 2025 with incorporated Bird's Nitrous Oxyde/Oxygen blender and general anesthesia with i.v. hypnoticum (Penthotal or Hypnomidate), analgeticum (Fentanyl) and muscle relaxant (Curalest) has been used. The patients were further monitored by means of blood pressure measurements (oscillotonometric method), simultaneous pulse count and ECG recording (Datascope 740 Recorder) and blood gases determination from a.femoralis (ABL 1, Radiometer Copenhagen).