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Published on: June 11, 2014
Effect of hyperthermia on breath-alcohol analysis
1Department of Biology, University of Victoria, B.C., Canada.
Journal of Forensic Sciences
|July 1, 1989
Summary
Mild hyperthermia does not affect blood-alcohol levels but distorts breath-alcohol readings. Monitoring body temperature before breathalyzer tests can improve accuracy for forensic analysis.
Area of Science:
- Forensic Science
- Toxicology
- Physiology
Background:
- Breath-alcohol analysis is crucial for forensic investigations.
- Accurate blood-alcohol concentration (BAC) estimation is vital.
- Factors affecting breath-alcohol measurements require further investigation.
Purpose of the Study:
- To investigate the impact of mild hyperthermia on blood-alcohol and breath-alcohol decay curves.
- To quantify the relationship between core body temperature and breath-alcohol concentration distortion.
- To assess the forensic implications for breath-alcohol analysis procedures.
Main Methods:
- Ethanol-intoxicated subjects were subjected to mild hyperthermia (2.5°C increase) via warm water immersion.
- Blood-alcohol concentration (BAC) was measured to establish the decay curve.
- Breath-alcohol concentration (BrAC) was measured concurrently to assess distortion.
- A correlation was calculated between core body temperature and BrAC/BAC differences.
Main Results:
- Mild hyperthermia did not significantly alter the blood-alcohol decay curve.
- Hyperthermia caused a significant distortion in the breath-alcohol decay curve, increasing BrAC up to 23% above BAC.
- An 8.62% increase in BrAC over BAC was observed for each 1°C rise in core body temperature.
Conclusions:
- Hyperthermia introduces a measurable error in breath-alcohol analysis.
- Temperature monitoring before breath sampling is recommended for forensic accuracy.
- Implementing a temperature correction factor can enhance the reliability of breath-ethanol analysis for predicting BAC.
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