Table 1:

Transcranial Doppler criteria for vasospasms after SAH

Vasospasm	MCA Vasospasm	BA Vasospasm	ACA Vasospasm	VA Vasospasm	PCA Vasospasm
Vasospasm	MCA Velocity (cm/s) & MCA/ICA Ratio	BA Velocity (cm/s) & BA/VA Ratio	ACA Velocity (cm/s)	VA Velocity (cm/s)	PCA Velocity (cm/s)
Mild	≥120 & ≥3	≥70 & ≥2
Moderate	>150 & ≥3	≥85 & ≥2.5	≥130	≥80	≥110
Severe	≥200 & ≥6	≥85 & ≥3

Note:—SAH indicates subarachnoid hemorrhage; MCA, middle cerebral artery, ICA, internal carotid artery; BA, basilar artery; VA, vertebral artery; ACA, anterior cerebral artery; PCA, posterior cerebral artery.