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Critical cerebral blood flow for production of hemiparesis after unilateral carotid occlusion in the gerbil.

Transient cerebral ischaemia, produced by temporary unilateral common carotid artery (CCA) occlusion, was studied in the gerbil by means of chronically implanted hydrogen electrodes. Unilateral CCA occlusion produced behavioural signs of neurological deficit only when regional cerebral blood flow values in the ipsilateral cerebral hemisphere fell below a critical range of 0.20-0.22 ml/gm brain/min. Postischaemic poor perfusion (no-reflow) was an infrequent observation after removal of CCA occlusion.