Related Experiment Videos
Arterial baroreflex function in humans anaesthetized with sevoflurane.
1Department of Anaesthesia, Akita University School of Medicine, Japan.
British Journal of Anaesthesia
|August 6, 1999
Summary
Sevoflurane anesthesia impairs arterial baroreflex control of heart rate. Baroreflex sensitivity remains reduced even after surgery and during recovery, impacting circulatory regulation.
Area of Science:
- Anesthesiology
- Cardiovascular Physiology
- Autonomic Nervous System
Background:
- Volatile anesthetics like sevoflurane can affect the arterial baroreflex.
- Noxious surgical stimuli may alter circulatory responses during anesthesia.
Purpose of the Study:
- To investigate the impact of sevoflurane anesthesia on heart rate baroreflex control throughout the perioperative period.
- To assess baroreflex sensitivity during anesthesia, surgery, and recovery phases.
Main Methods:
- Assessed baroreflex sensitivity in nine healthy patients undergoing sevoflurane anesthesia.
- Used phenylephrine and nitroprusside to induce controlled changes in blood pressure.
- Measured R-R intervals at baseline, during anesthesia, surgery, and recovery.
Main Results:
- Baroreflex sensitivity was significantly depressed during anesthesia, surgery, and recovery compared to awake values.
- Pressor test sensitivity improved during recovery but remained lower than baseline.
- No significant improvement in depressor test sensitivity was observed during recovery.
Conclusions:
- Sevoflurane anesthesia significantly impairs arterial baroreflex function.
- Baroreflex sensitivity deficits persist into the recovery period, suggesting prolonged autonomic dysfunction.
- These findings highlight the sustained impact of sevoflurane on cardiovascular autonomic regulation.