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

Table 4 The Duplex parameters of posterior cerebral artery (PCA) before and after photic stimulation among studied groups

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		57.3 ± 10.2	50.4 ± 12.9	55.8 ± 14.1	P = 0.043 F:=3.2 Df = 2
	After mean ± SD		61.7 ± 10.65	52.6 ± 15.1	56.4 ± 14.5
	Before vs. after	T value	4.22	1.011	0.796
	Before vs. after	P value	0.001	0.322	0.430
EDV	Before mean ± SD		26.6 ± 6.9	23.3 ± 7.18	24.4 ± 7.9	P = 0.084 F = 2.5 Df :2
	After mean ± SD		29.69 ± 7.5	23.9 ± 7.2	25.1 ± 9
	Before vs. after	T value	4.2	0.431	0.93
	Before vs. after	P value	0.001	0.671	0.357
Mean	Before mean ± SD		37.01 ± 7.8	32.3 ± 8.9	34.5 ± 9.5	P = 0.218 F = 1. 5 Df = 2
	After mean ± SD		40.38 ± 8.1	33.5 ± 9.7	35.8 ± 10.4
	Before vs. after	T-value	4.8	0.703	1.8
	Before vs. after	P value	0.001	0.489	0.07
PI	Before mean ± SD		0.8 ± 0.14	0.81 ± 0.22	0.84 ± 0.13	P = 0.69 F = 0.364 Df = 2
	After mean ± SD		0.77 ± 0.18	0.79 ± 0.14	0.84 ± 0.17
	Before vs. after	T-value	1.4	0.402	0.124
	Before vs. after	P value	0.168	0.691	0.902

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

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