Cerebral Edema Dynamics in Ischemic Stroke

Cerebral oedema is a critical and potentially fatal consequence of ischaemic stroke, characterised by the accumulation of fluid within brain tissue and a consequent rise in intracranial pressure. The process unfolds in phases: an early cytotoxic oedema driven by ionic imbalances and astrocyte swelling, followed by ionic oedema as disrupted ion gradients fuel further water influx, and then vasogenic oedema as blood–brain barrier integrity deteriorates, permitting plasma proteins and fluid to extravasate into the interstitial space. Key molecular mediators include aquaporin 4 channels on astrocyte endfeet, which regulate water transport, and SUR1-TRPM4 channels, which contribute to pathological ion flux. A breakdown of the blood–brain barrier exacerbates tissue swelling and promotes inflammatory cell infiltration, while the recently elucidated glymphatic and meningeal lymphatic systems influence fluid clearance and immune surveillance. Advanced imaging modalities such as diffusion‐weighted MRI and PET have enhanced our understanding of oedema evolution. Therapeutic strategies remain limited, focused on osmotic agents, channel modulators and emerging targets in neuroinflammation and lymphatic drainage, underscoring the need for improved interventions to reduce morbidity and global stroke burden.

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Cerebral Edema Dynamics in Ischemic Stroke publication trend

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Technical terms

Blood–Brain Barrier (BBB): Tight junction‐based endothelial interface that regulates passage of water, ions and macromolecules between blood and neural tissue.

Cytotoxic oedema: Intracellular fluid accumulation in neurons and astrocytes resulting from failure of ATP-dependent ion pumps after ischaemia.

Vasogenic oedema: Extracellular fluid accumulation due to increased vascular permeability and plasma leakage following BBB breakdown.

Aquaporin 4 (AQP4): Predominant water channel in astrocyte endfeet that facilitates bidirectional water movement across cell membranes.

SUR1-TRPM4 channel: Sulfonylurea receptor 1-regulated cation channel that mediates pathological sodium and water influx in injured brain tissue.

Glymphatic system: Network of perivascular pathways facilitating cerebrospinal fluid exchange with interstitial fluid to clear solutes and excess fluid.

References

1. Cerebral edema after ischemic stroke: Pathophysiology and underlying mechanisms. Frontiers in Neuroscience (2022).
2. Potential Therapies for Cerebral Edema After Ischemic Stroke: A Mini Review. Frontiers in Aging Neuroscience (2021).
3. Cerebral Edema Formation After Stroke: Emphasis on Blood–Brain Barrier and the Lymphatic Drainage System of the Brain. Frontiers in Cellular Neuroscience (2021).