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Brain Lymphatic Dysfunction in Subarachnoid Hemorrhage: Pathophysiology and Clinical Implications.
Shuangyi Guo1,2, John H Zhang2,3, Warren Boling3
1Department of Neurosurgery, Taihe Hospital, Hubei University of Medicine, Shiyan 442000, China.
Biomolecules
|May 4, 2026
Summary
Aneurysmal subarachnoid hemorrhage impairs the brain's clearance systems, leading to delayed injury and poor outcomes. Targeting these pathways offers new therapeutic strategies for subarachnoid hemorrhage recovery.
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Lymphatic System Biology
Background:
- Aneurysmal subarachnoid hemorrhage (SAH) has high morbidity and mortality despite treatment advances.
- Clinical outcomes depend on early brain injury, delayed cerebral ischemia, hydrocephalus, and cognitive issues, not just vasospasm.
- The brain's clearance pathways, the glymphatic system and meningeal lymphatics, are increasingly recognized as crucial in SAH.
Purpose of the Study:
- To review the function of glymphatic and meningeal lymphatic systems.
- To explain how SAH disrupts these clearance pathways.
- To discuss the clinical relevance for SAH outcomes and future therapeutic targets.
Main Methods:
- Literature review synthesizing current knowledge on glymphatic and meningeal lymphatic systems in SAH.
- Analysis of mechanistic and molecular factors driving clearance pathway dysfunction post-SAH.
- Discussion of clinical implications and future research directions.
Main Results:
- SAH disrupts cerebrospinal fluid-interstitial fluid exchange and lymphatic drainage due to increased intracranial pressure, blood burden, and inflammation.
- Impaired clearance leads to retention of waste products, exacerbating brain injury, blood-brain barrier disruption, and ischemia.
- Venous pathology and meningeal lymphatic dysfunction are key contributors to delayed injury and hydrocephalus after SAH.
Conclusions:
- Dysfunction of the glymphatic and meningeal lymphatic systems is a unifying mechanism in SAH, linking acute injury to chronic deficits.
- Understanding these clearance failures is critical for addressing EBI, DCI, hydrocephalus, and cognitive impairment.
- Targeting clearance pathways offers promising avenues for disease-modifying therapies in SAH.
Keywords:
aquaporin-4cerebrospinal fluid clearancecognitive impairmentdelayed cerebral ischemiaearly brain injuryglymphatic systemhydrocephalusmeningeal lymphatic vesselsneuroinflammationsubarachnoid hemorrhagevenous congestionMore Related Videos
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