Effects of different anesthesia methods on cognitive dysfunction after hip replacement operation in elder patients

Area of Science:

• Anesthesiology
• Geriatric Medicine
• Neuroscience

Background:

• Postoperative cognitive dysfunction (POCD) is a significant concern in elderly patients undergoing surgery.
• Anesthesia selection is a controversial risk factor for POCD.
• Understanding the mechanisms and anesthetic impact on POCD is crucial for patient outcomes.

Purpose of the Study:

• To investigate the relationship between anesthesia type (general anesthesia vs. epidural analgesia) and POCD occurrence in elderly hip replacement patients.
• To explore the potential mechanism of POCD involving amyloid-beta (Aβ) and tau protein levels.

Main Methods:

• A study involving 100 elderly hip replacement patients divided into general anesthesia (GA) and epidural analgesia (EA) groups.
• Assessed cognitive function using the Minimum Mental State Examination (MMSE).
• Measured blood levels of Aβ and tau proteins using ELISA and analyzed correlations with MMSE scores via Spearman rank correlation.

Main Results:

• Epidural analgesia (EA) was associated with significantly higher MMSE scores compared to general anesthesia (GA) (P < 0.05).
• GA enhanced Aβ and tau protein levels compared to EA (P < 0.05).
• Elevated Aβ and tau levels were observed in patients with POCD, correlating positively with lower MMSE scores (P < 0.05).

Conclusions:

• Epidural analgesia appears to be a preferable anesthetic method over general anesthesia for hip replacement in the elderly population.
• The enhancement of Aβ and tau protein levels may contribute to the mechanism underlying POCD.