Sagittal sinus venous pressure in hydrocephalus.

p R~VmUS worke r s h a v e d e m o n s t r a t e d a g r a d i e n t of p re s su re b e t w e e n ce rebro sp ina l f lu id p re s su re as m e a s u r e d e i the r in t h e c i s t e rna m a g n a or ven t r i c l e a n d t h e venous p ressu re in t h e supe r io r s a g i t t a l sinus.l,5 D a t a o b t a i n e d in our l a b o r a t o r y have con f i rmed th is d i f ference in p r e s su re in dogs w i th m e a n ce reb rosp ina l f l u id p r e s s u r e equa l to 147 ram. t I 2 0 a n d venous p re s su re in t he supe r io r s a g i t t a l s inus equa l to 90 m m . H~O. A c u t e e l eva t i ons of ce reb rosp ina l f l u id pressure in t h e n o r m a l dog d id n o t cause a r ise in t he v e n o u s p re s su re in t h e supe r io r s a g i t t a l sinus, b u t in t h e t y p e of h y d r o c e p h a l u s ind u c e d b y K a o l i n , a l l r ises of c e r e b r o s p i n a l f luid p re s su re were a c c o m p a n i e d b y an inc rease in venous p re s su re in t h e s u p e r i o r s a g i t t a l sinus. 4 I n a n a t t e m p t to def ine t h e g r a d i e n t of p r e s su re a v a i l a b l e for s h u n t i n g c e r e b r o s p i n a l f luid f r o m the l a t e r a l ven t r i c l e to t h e super ior s a g i t t a l s inus in i n fan t s w i th h y d r o c e p h a lus , s i m u l t a n e o u s r ecord ings of p re s su re in t h e s a g i t t a l s inus a n d l a t e r a l ven t r i c l e h a v e b e e n a c c o m p l i s h e d in 15 in fan t s . I n 5 of t h e s e ch i ld ren s i m u l t a n e o u s j u g u l a r venous p re s su re was m e a s u r e d . T h r e e c h i l d r e n h a d s inog rams to v i sua l ize t h e d u r a l v e n o u s syst em.