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Table 2 Cerebral circulatory arrest criteria by transcranial Doppler

From: Point-of-care transcranial Doppler by intensivists

Oscillating wave form (equal systolic forward flow and diastolic reversed flow)
Small systolic spikes of < 200 ms duration and < 50 cm/s pulse systolic velocity spike
Disappearance of all intra-cranial flow (loss of systolic and diastolic flow, where flow had been present previously intra-cranially, and still present extra-cranially)