Moderate hypothermia (30°C-33°C) has been widely used in cerebral aneurysms surgeries with excellent results. However not all aneurysms could be safely operated on since a small number, because of its special conditions, requires a longer period without arterial circulationThe advances of cardiac surgery with the use of profound systemic hypothermia to preserve organ function during cessation of the circulation termed deep hypothermic circulatory arrest (DHCA) permitted the approach of giant and complexes aneurysms with the preservation of brain function.

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