Supraglottic Jet Oxygenation Ventilation During Hysteroscopic Surgery

The patients in this group received oxygen therapy via nasal cannula at a flow rate of 5 L/min, with an oxygen concentration of 100%. An end-tidal carbon dioxide (ETCO2) monitoring catheter was placed at the nostril opening to monitor ETCO2, observe whether the waveform was regular, and record the values.

Gently insert an appropriately sized WNJ tube into one nostril of the subject. Connect one port of the tube to a jet ventilator (Twinstream), with the following SJOV (Synchronized Jet Ventilation) parameters: Driving pressure (DP): 15 psi (1 bar ≈ 15 psi) Respiratory rate: 15 breaths per minute Inspiratory-to-expiratory ratio (I:E): 1:2 Fraction of inspired oxygen (FiO₂): 100% Connect the other port to an end-tidal carbon dioxide (ETCO₂) monitoring catheter to observe the ETCO₂ waveform for regularity and record the numerical values.