[Experimental model of venous hemorrhagic infarction by cerebral sinus occlusion]

A new experimental model of the hemorrhagic infarction was devised to study the pathophysiology of the hemorrhagic infarction of the venous origin. To make a model of the hemorrhagic infarction by sinus occlusion, mixture of alpha-cyanoacrylate monomer and pantopaque was injected through a catheter introduced into the superior sagittal sinus in 15 dogs, using embolization technique. These dogs were divided into three groups according to the volume of the mixture injected into the sinus. In control groups (3 dogs), no mixture was injected. For partial sinus occlusion (5 dogs), 0.5-1.0 ml of mixture was injected into the sinus and 1.0-1.5 ml of mixture, for complete sinus occlusion (7 dogs). Changes of intracranial pressure (ICP), superior sagittal sinus pressure (SSSP), tissue pressure (TP) rCBF and histological changes were evaluated before and after sinus occlusion. The following results were obtained. (1) In control groups, ICP, SSSP and TP were 9 +/- 2.2 mmHg, 4 +/- 2.5 mmHg and 4-5 mmHg respectively, but in partial and complete sinus occlusion, SSSP and TP were higher than ICP. ICP, SSSP & TP were 32 +/- 5.4 mmHg, 35 +/- 6.5 mmHg and 37-42 mg, in partial sinus occlusion and 62 +/- 5.9 mmHg, 65 +/- 6.0 mmHg, 65-72 mmHg in complete sinus occlusion. (2) R-CBF in partial sinus occlusion showed no change even after sinus occlusion, but in complete sinus occlusion, decreased to 20% of that of the control group due to marked venous congestion.(ABSTRACT TRUNCATED AT 250 WORDS)