Pulse perfusion value predicts eye opening after sevoflurane anaesthesia: an explorative study

Area of Science:

• Anesthesiology
• Physiology
• Medical Technology

Background:

• Modern pulse oximetry provides a graphical pulse curve and a perfusion value (PV).
• PV may serve as a sensitive marker for sympathetic activity.
• The correlation between reduced PV and time to eye opening post-anesthesia requires investigation.

Purpose of the Study:

• To determine if PV can predict eye opening after sevoflurane general anesthesia.
• To investigate the relationship between PV reduction and recovery time.

Main Methods:

• Prospective, explorative clinical study of 20 patients (ASA I-II) undergoing elective breast tumor surgery.
• General anesthesia induced with sevoflurane to 1.2 minimum alveolar concentration.
• Monitoring included Bispectral Index, PV, heart rate, and CO2 at various time points.

Main Results:

• PV values were significantly lower before anesthesia and at eye opening compared to 15 minutes post-induction and at the end of surgery (P < 0.05).
• A reduction of 0.76 in PV was observed between the end of surgery and eye opening.
• Lower PV correlated with longer time to eye opening.

Conclusions:

• Pulse oximeter PV is a potentially useful variable for assessing recovery timing after general anesthesia.
• PV may help predict the time to eye opening post-anesthesia.
• Further research is warranted to validate PV as a recovery marker.