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Circadian disruption and surgical recovery
L A Farr1, C Campbell-Grossman, J M Mack
1Department of Adult Health and Illness, College of Nursing, University of Nebraska Medical Center, Omaha.
Nursing Research
|May 1, 1988
Summary
Surgery disrupts circadian rhythms in rats, affecting body temperature and activity levels. Recovery time correlates with the severity of circadian rhythm alteration post-surgery.
Area of Science:
- Physiology
- Chronobiology
- Surgical Recovery
Background:
- Circadian rhythms govern physiological processes.
- Surgery can significantly impact biological rhythms and recovery.
- Understanding postsurgical circadian disruption is crucial for patient care.
Purpose of the Study:
- To investigate the impact of surgery on circadian rhythms in rats.
- To assess the relationship between circadian alteration and postoperative recovery time.
- To model human responses to surgical stress on biological timing.
Main Methods:
- Implanted Sprague-Dawley rats with radio temperature-transmitters.
- Monitored body temperature and locomotor activity using metabolic cages and activity monitors.
- Recorded data for 12-20 days post-surgery, until rhythmic patterns were reestablished.
Main Results:
- Surgical procedures altered and uncoupled temperature and activity rhythms from external cues.
- Rats exhibited individual variations in returning to presurgical activity levels.
- A second period of disrhythmic and decreased activity occurred six days post-surgery.
- Greater circadian phase-shifts correlated with longer recovery times.
Conclusions:
- Surgery causes significant disruption to circadian rhythms in rats.
- The extent of circadian alteration is a positive predictor of recovery duration.
- These findings provide insights into postsurgical recovery mechanisms and circadian biology.