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Related Experiment Video

Updated: Jun 27, 2025

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Postoperative cognitive dysfunction: spotlight on light, circadian rhythms, and sleep.

Ellie Campbell¹, Mariana G Figueiro¹

¹Light and Health Research Center, Department of Population Health Science and Policy, Icahn School of Medicine at Mount Sinai, New York, NY, United States.

Frontiers in Neuroscience

|May 3, 2024

Summary

Postoperative cognitive dysfunction (POCD) is linked to circadian rhythm disruption (CRD). Addressing CRD, potentially with hospital lighting, may help prevent POCD after surgery.

Keywords:

cardiac surgery circadian rhythm circadian rhythm disruption cognitive dysfunction sleep

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Area of Science:

Neuroscience
Sleep Medicine
Chronobiology

Background:

Postoperative cognitive dysfunction (POCD) is a significant neurological concern following surgery.
Emerging evidence links POCD onset to circadian rhythm disruption (CRD).
Circadian rhythms, regulated by light-dark cycles, govern physiological and behavioral patterns.

Purpose of the Study:

To review the association between CRD and POCD.
To explore the pathological mechanisms linking CRD to cognitive impairment.
To discuss potential interventions for CRD in surgical patients.

Main Methods:

This narrative review synthesizes existing literature on POCD and CRD.
The review examines the impact of CRD on sleep architecture and related pathological processes.
Evidence for CRD as a contributor to POCD is summarized.

Main Results:

Postoperative CRD disrupts sleep architecture, leading to neuroinflammation, blood-brain barrier issues, and impaired glymphatic function.
These pathological changes are implicated in the development of POCD.
CRD is identified as a key factor in POCD pathogenesis.

Conclusions:

Correcting circadian rhythm dysregulation is crucial for addressing POCD.
Circadian-effective hospital lighting is proposed as a potential strategy to re-entrain rhythms in surgical patients.
Further research into light-based interventions may mitigate POCD.