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Updated: Mar 14, 2026

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
Published on: August 30, 2020
Relationship between venous drainage subtypes and sub-arachnoid hemorrhage subtypes: a meta-analysis
Chandra Prakash Yadav1,2, Jie Shen1,2, Mohan Karki1,2
1Department of Neurosurgery, Cerebral Vascular Disease Research Center, The Second Affiliated Hospital of Anhui Medical University, Anhui Medical University, 678 Fu Rong Road, Hefei, Anhui Province, China.
Deep venous drainage patterns influence subarachnoid hemorrhage risk. Type III venous drainage is linked to increased risk of subarachnoid hemorrhage, while Types I and II show varied associations.
Area of Science:
- Neurology
- Radiology
- Vascular Medicine
Background:
- Venous drainage patterns are crucial in neurovascular conditions.
- Subarachnoid hemorrhage (SAH) encompasses various subtypes with distinct etiologies.
- Understanding the link between venous drainage and SAH risk is vital for diagnosis and treatment.
Purpose of the Study:
- To investigate the association between venous drainage subtypes (Types I, II, and III) and the risk of specific subarachnoid hemorrhage subtypes.
- To clarify the role of different venous drainage patterns in the pathogenesis of SAH.
Main Methods:
- A meta-analysis was conducted on published case-control and case series studies from 2010 to 2014.
- Studies meeting inclusion criteria were subjected to rigorous statistical analysis.
- Eleven studies comprising 891 patients were included in the analysis.
Main Results:
- Type III venous drainage was associated with an increased risk of peri-mesencephalic subarachnoid hemorrhage (SAH) and idiopathic subarachnoid hemorrhage (ISAH).
- Type I and Type II venous drainage showed odds against peri-mesencephalic SAH.
- The findings suggest differential risks based on venous drainage subtype.
Conclusions:
- Type I deep venous drainage may not be significantly associated with peri-mesencephalic SAH or ISAH.
- Types II and III venous drainage appear to be associated with a higher risk of peri-mesencephalic SAH and ISAH, respectively.
- Venous drainage patterns are important indicators for SAH risk stratification.
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