Oxygen injector ventilation in adults and children: use of a variable pressure driving gas valve and a right angled connector.
An oxygen injector system (Harwill Medical, South Africa) was tested for ventilating intubated patients. There were 21 adults and 25 children. The system incorporates a variable pressure reducing value and a right-angled end connection with a 14 gauge oxygen exit nozzle and a 12 mm side port to atmosphere. Intravenous propofol was used to maintain anaesthesia, while the patients underwent alternate 10-minute periods of ventilation with the oxygen injector or an Ohmedia 7000 ventilator. Tidal volumes (ml/kg) achieved by mechanical ventilation were 8.06 +/- 1.89 in adults and 7.28 +/- 2.01 in children, compared with 5.79 +/- 2.13 and 4.57 +/- 1.58 respectively, with the oxygen injector (P > 0.05). Peak airway pressures (cmH2O) on mechanical ventilation were 18.61 +/- 3.06 and 20.21 +/- 2.89 in adults and children. The corresponding pressures with the oxygen injector were 19.42 +/- 3.97 and 18.49 +/- 3.27 (P > 0.05). Cardiovascular parameters were unchanged. A side port adaptation provided a suction capability for water at a rate of 9.16 ml/s. We conclude that this system is an effective universal ventilator suitable for short-term ventilation and suction of patients.
Payne
K A
KA
Anaesthesiology Department Medical School, University of Stellenbosch, Parowvallei, South Africa.
Van Rensburg
J
J
D000328:Adult; D000771:Anesthesia, Intravenous; D018686:Anesthetics, Intravenous; D001944:Breath Tests; D002648:Child; D002675:Child, Preschool; D004867:Equipment Design; D006801:Humans; D010100:Oxygen / Q000032:analysis; D010102:Oxygen Inhalation Therapy / Q000295:instrumentation*; D015742:Propofol; D012121:Respiration, Artificial / Q000295:instrumentation*; D013396:Suction / Q000295:instrumentation; D013990:Tidal Volume; D013997:Time Factors
D018686:Anesthetics, Intravenous; D010100:Oxygen; D015742:Propofol