Cerebral Hemispheric "Counter-Steal" Phenomenon During Hyperventilation in Cerebrovascular Diseases

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Abstract
Use of hyperventilation (HV) was recently suggested for the treatment of acute cerebrovascular insufficiency. There is indeed no general agreement on the effectiveness of hyperventilation even though clinical and experimental findings could support its value in clinical use. During carotid surgery, hyperventilation was used in order to attenuate cerebral ischemia effects during carotid clamping, and a counter-steal phenomenon affecting a whole cerebral hemisphere was demonstrated. This suggests the role that hyperventilation may play in the treatment of cerebral ischemia.