Prophylactic Intra-Arterial Injection of Vasodilator for Asymptomatic Vasospasm Converts the Patient to Symptomatic Vasospasm due to Severe Microcirculatory Imbalance

Table 2

Parameters of blood velocity.

	Internal carotid artery	Nonetiologic artery	Etiologic artery
Time to peak; (sec)
Before IA	1.70 ± 0.22	2.65 ± 0.54	2.83 ± 0.61
After IA	1.65 ± 0.31	2.05 ± 0.58	1.9 ± 0.51
Mean transit time (sec)
Before IA	1.98 ± 0.22	3.08 ± 0.22	3.08 ± 0.15
After IA	1.70 ± 0.37	2.70 ± 0.55	2.53 ± 0.12
Relative blood flow (%)
Before IA	100	39 ± 13	37 ± 14
After IA	100	56 ± 21	47 ± 18

IA: intra-arterial injection of vasodilator. All values are listed as mean ± standard deviation.