Abstract
One of the most life-threatening complications after the obliteration of intracranial arteriovenous malformations is the development of oedema and/or multifocal haemorrhage. Two main theories have been postulated so far in order to explain this situation. On one hand, "normal perfusion pressure breakthrough phenomenon" is based on the loss of cerebral vessel autoregulation due to the chronic vasodilation of perinidal microcirculation. On the other hand, the "occlusive hyperaemia" deals with thrombotic and venous obstruction phenomena that may also generate such manifestations. The aim of this study is to resume the main concepts of the "normal perfusion pressure breakthrough phenomenon" theory as well as the related animal models described up to date, their advantages and disadvantages, and the main conclusions obtained as a result of the experimental research.
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