[Changes in sedative level during induction of anesthesia using a single volatile anesthetic]

Area of Science:

• Anesthesiology
• Pharmacology

Background:

• Anesthesia induction requires careful monitoring of sedative levels.
• Comparing sedative effects of different anesthetic agents is crucial for patient safety.

Purpose of the Study:

• To compare sedative level changes during anesthesia induction using sevoflurane alone versus a combination of propofol and sevoflurane.
• To evaluate the utility of the bispectral index (BIS) monitor in assessing sedative levels during induction.

Main Methods:

• Thirty patients were randomized into two groups: sevoflurane alone (S group) and propofol-sevoflurane (PS group).
• Sedative levels were monitored using a bispectral index (BIS) monitor.
• Anesthesia induction times were assessed by the loss of eyelash reflex.

Main Results:

• Induction time was significantly shorter in the PS group (32 s) compared to the S group (65 s).
• The S group exhibited a smooth decrease in BIS values, while the PS group showed transient increases and greater variability.
• Two patients in the PS group experienced body movement, with transient BIS values exceeding 60.

Conclusions:

• Induction with sevoflurane alone results in smoother sedative level changes compared to propofol-sevoflurane.
• The bispectral index (BIS) monitor is a valuable tool for monitoring sedative levels during anesthesia induction.
• Sevoflurane monotherapy offers a smooth and stable anesthetic induction process.