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Circadian differences in the individual sensitivity to opiate overdose.
M Gallerani1, R Manfredini, D Dal Monte
1Department of Clinical and Experimental Medicine, University of Ferrara and St. Anna Hospital, Italy.
Critical Care Medicine
|February 15, 2001
Summary
Human sensitivity to opiate overdose varies throughout the day. This study found higher risks and overdose frequency in the afternoon and evening, with critical morning hours for lethal outcomes.
Area of Science:
- Pharmacology
- Chronobiology
- Toxicology
Background:
- Circadian variations in overdose frequency are known.
- The human response to opiates may also exhibit daily fluctuations.
Purpose of the Study:
- To investigate circadian differences in human response to opiates.
- To determine if these differences align with variations in overdose frequency.
Main Methods:
- Prospective observational study over 8 years in Ferrara, Italy.
- Analysis of 518 nonlethal and 110 lethal opiate overdoses.
- Examined overdose frequency, naloxone dosage, hospitalization, and death risk by time of day.
Main Results:
- Nonlethal overdoses peaked in the afternoon/early evening.
- Naloxone requirements and hospitalization risk were highest in the early morning (3-9 AM).
- Lethal overdoses peaked in the evening, with highest death risk in the early morning (3-9 AM).
Conclusions:
- Evidence supports circadian variations in individual sensitivity to opiate overdose.
- Timing of opiate use and overdose risk is crucial.