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Modification of an automated vascular diagnostic system for hyperbaric use
J W Dooley1, W J Mehm, C A Jennings
1Department of Scientific Laboratories, Armed Forces Institute of Pathology, Washington, DC 20306-6000.
Undersea Biomedical Research
|May 1, 1990
Summary
This study modified a vascular diagnostic system (VASCULAB) for hyperbaric oxygenation studies. Modifications enabled accurate blood pressure and blood flow measurements under high-pressure conditions.
Area of Science:
- Biomedical Engineering
- Cardiovascular Physiology
- Hyperbaric Medicine
Background:
- Noninvasive vascular diagnostic systems are crucial for assessing cardiovascular health.
- Hyperbaric oxygenation (HBO) requires specialized equipment for safe and accurate physiological measurements.
- Previous systems faced limitations in high-pressure environments.
Purpose of the Study:
- To modify the VASCULAB system for reliable use during normobaric and hyperbaric oxygenation.
- To enable automated, noninvasive measurement of blood pressure and plethysmographic blood flow responses under varying pressures.
- To overcome technical challenges associated with operating sensitive electronic equipment within hyperbaric chambers.
Main Methods:
- Integration of a microprocessor program controller (VSC21) within the hyperbaric chamber.
- Nitrogen purging of the VSC21 controller for fire prevention within an acrylic case.
- Adaptation of external components and routing of cables through chamber penetrations.
- Modification of the VSC21 to withstand pressures exceeding 1.68 bar, including ventilation of keypad switches.
Main Results:
- The modified VASCULAB system successfully measured blood pressure and calf blood flow at pressures up to 2.96 bar.
- Initial pressure limitations disabling the VSC21 were overcome through system modifications.
- Automated assessment of vascular parameters was achieved in a hyperbaric environment.
Conclusions:
- The VASCULAB system can be effectively modified for noninvasive vascular diagnostics under hyperbaric conditions.
- The enhancements allow for crucial physiological data collection during HBO studies.
- This facilitates advanced research into the cardiovascular effects of hyperbaric oxygenation.