[Diuretics and their potential effect on breath-alcohol concentration--a case report]

Area of Science:

• Forensic Science
• Toxicology
• Pharmacology

Background:

• Breath-alcohol analysis is a standard in traffic law enforcement.
• Objections to its accuracy have diminished over time.
• A case questioned the influence of diuretics on breath-alcohol test results.

Purpose of the Study:

• To evaluate the potential impact of diuretic use on breath-alcohol concentration measurements.
• To determine if diuretics like torasemide and spironolactone can falsely elevate blood alcohol content readings.

Main Methods:

• Literature review on diuretic-induced urinary output.
• Theoretical calculation of potential changes in ethanol concentration based on diuresis.
• Analysis of diuretic mechanisms and their effect on body fluid distribution.

Main Results:

• Maximum theoretical shift in breath-alcohol concentration due to diuresis is approximately 0.007 mg/l.
• Torasemide can cause significant urinary output, while spironolactone has a minimal effect.
• Dehydration from diuretics can impair driving ability, irrespective of alcohol levels.

Conclusions:

• Diuretic use, including torasemide and spironolactone, does not significantly alter breath-alcohol analysis results.
• The theoretical shift in ethanol concentration is too small to affect legal driving limits.
• Focus should remain on potential driving impairment due to dehydration caused by diuretics.