Article Figures & Data
Figures
- Fig 1.
Color pressure maps (mm Hg) in a healthy subject in the axial (A) and coronal (D) planes as well as for a patient (C and F) with a type IIa DAVF affecting the left transverse and sigmoid sinus (arrows). MIP images in the axial (B) and coronal (E) plane show the site of arteriovenous shunting (arrows) where there is increased pressure seen on the axial (C) and coronal (F) pressure maps.
- Fig 2.
Boxplots showing the pressure change (A) and blood flow rates (B) along the TS in the patients with DAVF (n = 7) and healthy subjects (n = 60). The pressure drops were computed from the difference in pressure in 2 cut planes placed on each TS. The cut planes were placed 25 mm and 50 mm from the torcular Herophili. The median pressure drop in the ipsilateral and contralateral TS to the DAVF were 0.055 ± 0.130 mm Hg and −0.367 ± 0.205 mm Hg, respectively (P = .109). In the healthy subjects, the pressure drops were −0.105 ± 0.033 mm Hg in the left TS and −0.101 ± 0.043 mm Hg in the right TS (P = .994). The median blood flow rates in the patients with DAVF show a value of 40 ± 129 mL/min in the TS affected by the fistula and, in the TS contralateral to the fistula, equal to 328 ± 134 mL/min (P = .046). The median flow in healthy subjects including all anatomy types was significantly larger in the right TS compared with the left TS, with values of 262 ± 83 mL/min and 121 ± 56 mL/min, respectively (P < .001).
