Isoflurane anesthesia and sleep deprivation trigger delayed and selective sleep alterations

Area of Science:

• Neuroscience
• Anesthesiology
• Sleep Medicine

Background:

• Isoflurane anesthesia partially compensates for NREM sleep but not REM sleep, leading to post-anesthetic REM sleep rebound.
• Sleep deprivation activates homeostatic mechanisms, triggering compensatory NREM and REM sleep rebounds during recovery.
• Combined sleep deprivation and anesthesia are common pre-surgery procedures.

Purpose of the Study:

• To investigate the impact of pre-anesthetic sleep deprivation on post-anesthetic sleep-wake architecture.
• To compare the effects of isoflurane anesthesia alone versus isoflurane preceded by sleep deprivation on recovery sleep.

Main Methods:

• Adult mice underwent 90-minute isoflurane exposure or 6-hour sleep deprivation followed by isoflurane exposure.
• Post-anesthetic sleep architecture was monitored for three consecutive days.
• Theta power during REM sleep was analyzed to assess sleep quality.

Main Results:

• Isoflurane anesthesia induced NREM and REM sleep rebound and decreased wakefulness during the initial recovery period, irrespective of prior sleep pressure.
• Sleep deprivation preceding isoflurane anesthesia resulted in a persistent reduction in theta power during post-anesthetic REM sleep for at least three days.
• Isoflurane anesthesia alone did not fully compensate for natural NREM sleep needs, as evidenced by NREM sleep rebound.

Conclusions:

• Isoflurane anesthesia partially compensates for NREM sleep, but not REM sleep, and can elicit sleep rebound.
• Preoperative sleep deprivation, when combined with isoflurane anesthesia, leads to a persistent disruption of REM sleep quality.
• Preoperative sleep deprivation may negatively impact postoperative recovery by causing lasting sleep quality disturbances.