Pre-existing cognitive impairment and post-operative cognitive dysfunction: should we be talking the same language?

Area of Science:

• Gerontology
• Anesthesiology
• Neuroscience

Background:

• Cognitive dysfunction following anesthesia and surgery in the elderly is a recognized phenomenon with historical roots dating back to the 19th century.
• Early observations linked adverse cognitive outcomes to invasive procedures, with anecdotal reports implicating anesthesia.
• Scientific evaluation intensified in the 1970s, particularly concerning cognitive changes after cardiac surgery.

Discussion:

• The prevailing hypothesis attributed cognitive decline post-cardiac surgery to the cardiopulmonary bypass (heart-lung machine).
• This belief became ingrained in surgical understanding and guided numerous studies investigating the machine's specific role.
• This historical focus may have overshadowed other potential contributors to postoperative cognitive impairment.

Key Insights:

• Historical records indicate awareness of anesthesia's impact on cognition predates modern scientific methods.
• Cardiac surgery's complexity, especially cardiopulmonary bypass, was long considered the primary driver of cognitive deficits.
• The long-standing assumption about cardiopulmonary bypass warrants critical re-examination in light of evolving research.

Outlook:

• Future research should explore a broader range of factors contributing to postoperative cognitive dysfunction.
• Investigating the precise mechanisms beyond cardiopulmonary bypass is crucial for developing targeted interventions.
• A comprehensive understanding is needed to mitigate cognitive risks associated with anesthesia and surgery in older patients.