 Oscillation trough pressure is the instantaneous pressure within the HFOV circuit following the oscillating piston reaching its complete negative deflection.Transtracheal jet ventilation refers to a type of high-frequency ventilation, low tidal volume ventilation provided via a laryngeal catheter by specialized ventilators that are usually only available in the operating room or intensive care unit.This procedure is occasionally employed in the operating room when a difficult airway is anticipated.