Narrative review proposes an astrocyte-centered framework for perioperative cognitive vulnerability in older adults
This narrative review proposes an astrocyte-centered, hypothesis-generating framework linking sleep-circadian disruption, inflammation and brain state to perioperative cognitive vulnerability in older adults; it is not a validated biomarker or treatment strategy. [1]
Automatic summary · not editorially reviewed
The key findings
The review presents an astrocyte-centered temporal resilience idea as a hypothesis-generating framework for integrating brain-immune-behavior processes in older adults' perioperative cognitive vulnerability. [1]
Aging may reduce the temporal precision and adaptive range of interacting systems, which could limit recovery after surgical and anesthetic stress. [1]
Direct evidence for an astrocyte-specific causal pathway in perioperative populations remains limited, and the framework is not a validated clinical biomarker or treatment strategy. [1]
The source at a glance
- Study type / format
- Narrative review (abstract only)
- Population / context
- Older adults with perioperative cognitive vulnerability, as discussed in a narrative review.
- Summary based on
- Study abstract
- Original publication
- September 19, 2026
Framework for older adults' perioperative cognition
The review addresses perioperative cognitive vulnerability in older adults and describes it as reflecting interactions among inflammatory stress, altered brain state, sleep-circadian disruption and recovery capacity. It presents an astrocyte-centered temporal resilience idea as a hypothesis-generating framework for integrating brain-immune-behavior processes. The authors state that "astrocyte-centered" is an organizing perspective, not a claim of exclusive cellular causation.
Supporting source [1]
Astrocyte functions and aging in the proposed model
According to the review, astrocytes take part in sleep-pressure signaling, circadian regulation, neurometabolic support, inflammatory responses, extracellular homeostasis and clearance-related physiology, but these functions operate within broader neuronal, microglial, vascular, endocrine and environmental networks. Aging may reduce the temporal precision and adaptive range of these interacting systems, which could limit recovery after surgical and anesthetic stress. Postoperative delirium, delayed neurocognitive recovery and postoperative neurocognitive disorder may therefore partly reflect impaired re-coordination of sleep-circadian, immune, metabolic and behavioral processes.
Supporting source [1]
Mechanistic versus associative evidence and open questions
The review synthesizes evidence on astrocytic clocks, inflammatory-metabolic stress, sleep fragmentation, circadian misalignment, anesthesia-induced sleep-like states, glymphatic and aquaporin-4-related physiology, and hospital time ecology. It distinguishes mechanistic evidence from associative clinical findings and asks whether perioperative chronodisruption acts as a mediator of later cognitive vulnerability, a marker of pre-existing susceptibility, or both. The authors state that direct evidence for an astrocyte-specific causal pathway in perioperative populations remains limited. The framework is meant to guide future studies of temporal phenotyping, intervention timing and exploratory target engagement, not to define validated clinical biomarkers or treatments.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. This is a narrative review proposing a hypothesis-generating framework, not a systematic review or primary study. Direct evidence for an astrocyte-specific causal pathway in perioperative populations is described as limited, and the framework does not define validated clinical biomarkers or treatment strategies.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Fan W, Han S, Wang C, Gao J. · europepmc.org · September 19, 2026