Clinical Study

Description of the Vasospasm Phenomena following Perimesencephalic Nonaneurysmal Subarachnoid Hemorrhage

Table 3

Summary of the minimum, maximum, and average flow velocities in the intracranial arteries.

ArteryMinimum (cm/sec)Maximum (cm/sec)Mean (cm/sec)Std. deviation (cm/sec)

ICA215233.596.95
MCA3418485.0836.56
MCA/ICA1.066.752.621.25
ACA2514668.3228.66
PCA2412753.3320.66
VA199042.2515.23
Proximal BA1811649.6322.78
Distal BA1815371.6736.50
Distal BA/VA0.595.051.730.83

ICA: internal carotid artery; MCA: middle cerebral artery; ACA: anterior cerebral artery; PCA: posterior cerebral artery; VA: vertebral artery; BA: basilar artery.