By Lila Rouland | Published on August 22, 2025 | 2 min read#POCD #Neurology #Anesthesia
#Surgery
Postoperative cognitive decline
(POCD) is a frequent and concerning complication, particularly among
elderly
patients undergoing major surgery. This condition manifests as impairments in
memory, attention, or
processing speed, which may durably impact quality of
life, delay recovery, and increase the risk of dependency.
A major limitation in managing this
condition lies not only in the
absence of a standardized definition, but also
in the wide
methodological variability across studies and the lack of
specific
diagnostic tools. These gaps hinder comparison of results and slow the
development of targeted prevention strategies. A central challenge is to
disentangle the respective contributions of anesthesia and surgery to the onset
of these impairments, while identifying patients at highest risk through
clinical or biological criteria.
Against this background, this study
was undertaken to evaluate the association between anesthesia, surgery, and
cognitive alterations, in order to better understand the underlying mechanisms
and inform future preventive and therapeutic strategies.
Anesthesia: guilty or merely an
accomplice?
The methodology is based on the selection of numerous clinical and experimental
studies that assessed cognitive function in patients before and after surgery.
These works used standardized neuropsychological batteries to measure memory,
attention, and processing speed. In some cases, advanced brain imaging
techniques were also employed to objectify structural or functional changes.
Results show that postoperative
cognitive decline is more common in elderly patients, particularly those with
cardiovascular comorbidities or
prior cognitive frailty. General anesthesia is
frequently implicated, but evidence suggests that
systemic inflammation induced
by surgery, oxidative stress, and
cerebral micro-injuries play equally critical
roles. Anesthetic agents (e.g., propofol, inhaled agents) may exert variable
effects on neuronal plasticity, with no clear consensus. Finally, some studies
report
partial recovery of cognitive functions, while others describe
persistent sequelae—underscoring the importance of individual and contextual
factors.
POCD: inevitable fate or preventable
condition?
Postoperative cognitive decline remains a common complication, especially in
older patients, and represents a significant public health concern. Recent
evidence suggests that anesthesia and surgical stress are both strong
contributors to the development of this condition in vulnerable individuals.
The aim of this review was to
evaluate the links between anesthesia, surgery, and cognitive alterations, and
to shed light on the underlying mechanisms. Findings suggest that POCD arises
from a
multifactorial process involving anesthetic effects, systemic
inflammation, oxidative stress, and preexisting frailty, highlighting the
complexity of its etiology. However, the analysis is limited by the absence of
a standardized definition of POCD, methodological heterogeneity across studies,
and a lack of long-term follow-up data.
Future research should focus on
multicenter studies with
standardized protocols, identification of predictive
biomarkers, exploration of the impact of different anesthetic agents, and the
development of personalized strategies to optimize perioperative management and
postoperative cognitive monitoring.
Read next: Postoperative delirium: does melatonin really work?
About the author – Lila RoulandDoctor of Oncology, specialized in Biotechnology and Management
