Journal of neuroimaging : official journal of the American Society of Neuroimaging · 2011
Flow velocity of the superior sagittal sinus is reduced in patients with idiopathic normal pressure hydrocephalus.
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Kuriyama Nagato, Tokuda Takahiko, Yamada Kei, Akazawa Kentaro, Hosoda Makoto, Sakai Koji, Watanabe Yoshiyuki, Nakagawa Masanori
Аннотация
BACKGROUND: The pathogenesis and diagnostic methods for idiopathic normal pressure hydrocephalus (iNPH) have been active areas of research in recent years. This study was performed to determine whether there is a venous return abnormality in the intracranial circulation of patients with iNPH.
METHODS: The subjects were 20 patients with iNPH (Group N) and 24 normal controls (Group C). MR venography (MRV) was performed at the superior sagittal sinus 2 cm above the confluence of the sinuses, and the flow velocities were compared between Groups N and C.
RESULTS: During normal breathing, the maximum velocities were significantly lower in Group N (18.8 cm/second) than in Group C (22.9 cm/second; (P < .01). During the Valsalva maneuver, compared to normal breathing, the velocity decreased in both groups, but both the maximum (Max V) and minimum (Min V) velocities were significantly lower in Group N than in Group C (P < .01).
CONCLUSIONS: The flow velocity at the superior sagittal sinus was lower and the flow velocity during the Valsalva maneuver decreased more in patients with iNPH than in controls. The results may reflect the presence of abnormal intracranial venous flow in iNPH.
METHODS: The subjects were 20 patients with iNPH (Group N) and 24 normal controls (Group C). MR venography (MRV) was performed at the superior sagittal sinus 2 cm above the confluence of the sinuses, and the flow velocities were compared between Groups N and C.
RESULTS: During normal breathing, the maximum velocities were significantly lower in Group N (18.8 cm/second) than in Group C (22.9 cm/second; (P < .01). During the Valsalva maneuver, compared to normal breathing, the velocity decreased in both groups, but both the maximum (Max V) and minimum (Min V) velocities were significantly lower in Group N than in Group C (P < .01).
CONCLUSIONS: The flow velocity at the superior sagittal sinus was lower and the flow velocity during the Valsalva maneuver decreased more in patients with iNPH than in controls. The results may reflect the presence of abnormal intracranial venous flow in iNPH.