Related Experiment Videos
Physiological variations in blood ethanol measurements during the post-absorptive state
A W Jones1, L Jorfeldt, H Hjertberg
1Department of Alcohol Toxicology, University Hospital, Linköping, Sweden.
Journal - Forensic Science Society
|September 1, 1990
Summary
This study on blood alcohol concentration found no sporadic fluctuations during ethanol metabolism. Careful blood sampling is crucial to minimize pre-analytical variations and ensure accurate measurements.
Area of Science:
- Pharmacokinetics
- Analytical Chemistry
- Clinical Chemistry
Background:
- Accurate blood alcohol concentration (BAC) monitoring is vital for clinical and forensic applications.
- Understanding temporal variations in BAC during ethanol metabolism is essential for reliable interpretation of results.
- Previous studies have suggested potential fluctuations in BAC, necessitating further investigation.
Purpose of the Study:
- To investigate the presence of sporadic fluctuations in blood and plasma ethanol concentrations during the post-peak phase of ethanol metabolism.
- To assess the contribution of sampling methods to observed variations in ethanol concentrations.
- To establish the reliability of ethanol concentration measurements through headspace gas chromatography.
Main Methods:
- Arterial plasma and venous whole blood samples were collected from healthy volunteers at 3-10 minute intervals during the post-peak ethanol metabolism phase.
- Ethanol concentrations were quantified using headspace gas chromatography, a validated analytical technique.
- Physiological variation was assessed by analyzing residual standard deviations after fitting concentration-time regression models.
Main Results:
- Headspace gas chromatography demonstrated high precision with low standard deviations (0.28 mg/dl for whole blood, 0.26 mg/dl for plasma) and coefficients of variation (0.43% and 0.79%, respectively).
- Physiological time-to-time variations in ethanol concentrations ranged from 0.43-3.7 mg/dl (0.65-16%).
- Maximum variations were observed during periods of impeded blood flow, indicating pre-analytical influences.
Conclusions:
- The study's findings do not support the existence of sporadic fluctuations or spiking in blood alcohol concentration profiles during the post-absorptive state.
- Careful control of blood sampling techniques is paramount to minimize pre-analytical sources of variation.
- Accurate and reliable ethanol concentration measurements depend heavily on meticulous sample collection protocols.