Cerebrovascular reactivity after functional activation of the Brain using Photic Stimulation in Migraine and Tension Type Headache: a transcranial doppler Ultrasonography Study

Table 5 Duplex parameters of vertebral artery (VA) before and after photic stimulation among studied group

Duplex parameters			Migraine headache (37 cases)	Tension headache (24 cases)	Control 50 normal	Two way ANOVA Time (before versus after stimulation)X groups (three groups)
PSV	Before mean ± SD		50.3 ± 13.1	46.1 ± 12.8	49.7 ± 10.9	P = 0.062 F = 2.8 Df = 2
	After mean ± SD		53.4 ± 12.3	51.6 ± 16.6	50.8 ± 11.6
	Before vs. after	T value	2.06	3.262	1.6
	Before vs. after	P value	0.04	0.003	0.11
EDV	Before mean ± SD		22.2 ± 5.8	19.4 ± 4.9	20.2 ± 6.2	P = 0.102 F = 2.3 Df = 2
	After mean ± SD		22.9 ± 7.04	22.2 ± 7.8	20.5 ± 6.9
	Before vs. after	T value	0.81	2.725	0.444
	Before vs. after	P value	0.41	0.012	0.659
Mean	Before mean ± SD		31.9 ± 7.5	28.3 ± 6.7	30.4 ± 7.2	P = 0.07 F: 2.7 Df = 2
	After mean ± SD		33.1 ± 7.8	32.0 ± 9.3	30.7 ± 7.9
	Before vs. after	T value	1.15	3.405	1.3
	Before vs. after	P value	0.25	0.002	0.197
PI	Before mean ± SD		0.8 ± 0.18	0.86 ± 0.24	1.3 ± 1.9	P = 0.26 F: 1.36 Df = 2
	After mean ± SD		0.9 ± 0.25	0.93 ± 0.35	0.93 ± 0.22
	Before vs. after	T value	0.24	1.169	1.39
	Before vs. after	P value	0.8	0.255	0.171

PSV; Peak Systolic velocity, EDV; End Diastolic Velocity, PI; pulsatility Index, Mean; mean flow velocity, P value is significant < 0.05

ISSN: 1471-2377