Does the prone sleeping position affect the intracranial dural venous flow?
There are few studies documenting the effect of posture on intracranial dural venous flow. The aim of the present study was to explore alterations caused by the prone position using magnetic resonance (MR) venography.
A total of eight patients (five men and three women) underwent non-contrast MR venography in both supine and prone positions.
In the prone position, an increase in intracranial dural venous flow was found in all patients in the non-dominant transverse and sigmoid sinuses. An increase in venous flow to the straight sinus was observed in 75% of the patients. Flow to the superior ophthalmic vein decreased in three patients. No postural flow alterations were observed in any of the patients in the superior sagittal, dominant transverse, and sigmoid sinuses.
Based on results of the study, in the prone sleeping position, part of the intracranial venous flow may be preferentially drained through the straight and non-dominant transverse sinuses.
KeywordsIntracranial venous flow Prone position Dural sinus MRV
All the authors equally contributed to the study.
Satoshi Tsutsumi projected the study.
Hisato Ishii and Yukimasa Yasumoto collected the imaging data.
Hideo Ono and Hisato Ishii analyzed the imaging data.
Satoshi Tsutsumi wrote the manuscript.
Compliance with ethical standards
The present study was performed in accordance with our institution’s guidelines for human research. Informed consent was obtained from all patients prior to participation in the present study.
Conflict of interest
The authors have no conflict of interest concerning the materials or methods used in this study or the findings presented in this paper.
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