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Can an anesthesia machine flush valve provide for effective jet ventilation?
S D Gaughan1, J L Benumof, G T Ozaki
1School of Medicine, Department of Anesthesiology, University of California at San Diego.
Anesthesia and Analgesia
|April 1, 1993
Summary
This study found that anesthesia machine flush valves can provide adequate oxygen flow for transtracheal jet ventilation (TTJV) in emergencies. Specific anesthesia machines, like the Ohmeda Modulus II and Dräger Narkomed 2, yielded better results than others.
Area of Science:
- Anesthesiology
- Respiratory Physiology
- Medical Devices
Background:
- Transtracheal jet ventilation (TTJV) is a critical emergency procedure.
- Effective TTJV requires a high-pressure oxygen source.
- Anesthesia machine flush valves are a potential, but unproven, oxygen source for TTJV.
Purpose of the Study:
- To evaluate the efficacy of anesthesia machine flush valves for TTJV.
- To compare tidal volume (VT) and minute ventilation (VE) using different IV catheters and jet stylets.
- To assess oxygen delivery from specific anesthesia machine models via their flush valves.
Main Methods:
- In vitro study using a mechanical lung model with variable compliance (10-100 mL/cm H2O).
- Measured VT and VE through 14-, 16-, and 18-gauge IV catheters and small, medium, and large jet stylets.
- Activated flush valves on Dräger Narkomed 2/2A and Ohmeda Modulus II/II Plus anesthesia machines with a 1:1 I:E ratio.
Main Results:
- Ohmeda Modulus II and Dräger Narkomed 2 flush valves produced the largest VT and VE.
- Ohmeda Modulus II Plus produced the smallest VT and VE.
- Performance varied significantly between anesthesia machine models.
Conclusions:
- Anesthesia machine flush valves can be a viable oxygen source for TTJV, but performance varies by machine.
- Specific models (Ohmeda Modulus II, Dräger Narkomed 2) are more effective.
- Further research is needed to optimize TTJV protocols using these devices.