Potential increased propofol sensitivity in cognitively impaired elderly: a controlled, double-blind study.

Area of Science:

• Anesthesiology
• Geriatric Medicine
• Neuroscience

Background:

• Cognitive impairment in the elderly may increase sensitivity to anesthetic agents.
• Anesthetic drug requirements can be influenced by cognitive status.

Purpose of the Study:

• To investigate the effect of cognitive status on propofol consumption in elderly surgical patients.
• To determine if cognitive impairment alters anesthetic requirements.

Main Methods:

• Sixty elderly patients were divided into cognitively normal (CogN) and cognitively impaired (CogI) groups based on MoCA scores.
• Propofol was administered via target-controlled infusion to maintain BIS 55-65, with consumption recorded at key time points.
• Bispectral Index (BIS) at eyelash reflex abolition and propofol dose to reach BIS 50 were primary outcomes.

Main Results:

• Cognitively impaired patients had a higher BIS at eyelash reflex abolition (65.3 vs. 61.1, p=0.031).
• Cognitively impaired patients required significantly less propofol to reach BIS 50 (1.24 vs. 1.46 mg/kg, p=0.003).
• Postoperative cognitive function, pain scores, and opioid consumption did not differ between groups.

Conclusions:

• Elderly patients with cognitive impairment show increased propofol sensitivity.
• Cognitive status is a significant factor influencing anesthetic requirements in the elderly.
• Lower propofol doses may be needed for anesthetizing elderly patients with cognitive impairment.