Description of the Vasospasm Phenomena following Perimesencephalic Nonaneurysmal Subarachnoid Hemorrhage

Table 4

Vasospasm after PM-NASAH versus ASAH.

	PM-NASAH VS in our series	ASAH VS in the literature
Incidence	49.2%	70% [23]
Clinical significance	None	Ischemic neurological symptoms in 50% of large artery VS [16]
Spasm onset*	4.9 d	3 d [23]
Day of max. velocity*	7.03 d	6–8 d [23]
Spasm resolution*	15.5 d	2-3 weeks [23]

∗Average number of days/weeks after hemorrhage.