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Related Experiment Videos

Circadian variation in unexpected postoperative death.

J Rosenberg1, M H Pedersen, T Ramsing

  • 1Department of Surgical Gastroenterology, Hvidovre University Hospital, Denmark.

The British Journal of Surgery
|December 1, 1992
PubMed
Summary

Sudden unexpected deaths after abdominal surgery often occur at night. Further research into nocturnal cardiac function and monitoring during this high-risk period is needed.

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Area of Science:

  • Medical research
  • Surgical outcomes
  • Circadian rhythms

Background:

  • Unexpected deaths can occur after major surgery, with cardiac or thromboembolic causes.
  • Postoperative hypoxemia, particularly at night, may trigger cardiac events.
  • Circadian variations in physiological processes are increasingly recognized.

Purpose of the Study:

  • To investigate the circadian variation of sudden unexpected deaths following abdominal surgery.
  • To identify potential high-risk periods for nocturnal mortality.
  • To inform future research and clinical monitoring strategies.

Main Methods:

  • Retrospective analysis of unexpected deaths between 1985-1989 following abdominal surgery.
  • Categorization of deaths into day (08:00-16:00), evening (16:00-24:00), and night (24:00-08:00) periods.

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  • Review of autopsy findings to determine cause of death where available.

    • Main Results:

    • Overall, 13 out of 18 unexpected deaths occurred during the night (24:00-08:00).
    • Among patients with autopsy, 8 of 11 unexpected deaths occurred at night (P < 0.005).
    • Among patients without autopsy, 5 of 7 unexpected deaths occurred at night (P < 0.04).

    Conclusions:

    • A significant number of unexpected postoperative deaths following abdominal surgery occur during the night.
    • These findings suggest a potential link between nocturnal physiological changes and sudden death.
    • Further investigation into sleep-related effects on postoperative cardiac function and evaluation of nocturnal monitoring are warranted.