Abstract
Intracranial CBF monitoring was performed by either the laser Doppler or the heat pump method in five patients with intracranial arteriovenous malformations (AVMs). The size of the nidus was classified into two groups; large size (4-6cm·2 cases) and moderate size (2-4cm·3 cases). CBF was measured around the nidus before and after removal of the AVMs; adjacent to the feeding artery, draining vein, and normal cortex. The main feeding artery was temporarily clipped and the dynamic change of CBF was observed.
The CBF values were reduced in all of the large size group and one of the moderate size group in the areas adjacent to the proxymal site of feeding arteries before removal of the AVMs. Those areas were hyperperfused after removal of the AVMs and small hemorrhages occurred in those areas after surgery.
Those facts indicate that hypoperfusion (steal) around AVMs may cause the evolution of NPPB after surgery.
