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The Ohmeda Universal PAC drawover apparatus. A technical and clinical evaluation
Anaesthesia
|October 1, 1995
Summary
The Ohmeda Universal PAC drawover apparatus may over-deliver anesthetic vapor at low gas flows and high temperatures. Clinical use was satisfactory, but enflurane concentrations were insufficient during spontaneous breathing.
Area of Science:
- Anesthesiology
- Medical Devices
- Biomedical Engineering
Background:
- The Ohmeda Universal PAC drawover apparatus is a modified anesthetic vaporizer.
- Previous vaporizers had specific limitations that this modification aimed to address.
Purpose of the Study:
- To assess the vapor output of the Ohmeda Universal PAC drawover apparatus under various conditions.
- To evaluate its clinical performance with isoflurane and enflurane during different ventilation modes.
Main Methods:
- The study measured vapor output at different gas flow rates and temperatures.
- Clinical performance was observed during spontaneous and positive pressure ventilation using specific anesthetic agents.
Main Results:
- The apparatus tended to over-deliver anesthetic vapor, especially at low gas flows and high temperatures.
- Clinical performance was generally satisfactory, but adequate enflurane concentrations were not achieved during spontaneous ventilation.
Conclusions:
- The Ohmeda Universal PAC drawover apparatus shows potential for field and military anesthesia due to its robust design, capacity, and thermocompensation.
- Careful monitoring is needed due to potential for over-delivery of vapor and insufficient concentrations with certain agents and ventilation modes.
