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

Table 2 Duplex parameters of middle cerebral artery (MCA) 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		83.54 ± 23.3	68.9 ± 17.3	88.1 ± 21.7	P = 0.001 F = 7.9 Df = 2
	After		93.4 ± 24.02	71.6 ± 14.8	89.8 ± 20.9
	Before vs. after	T-value	6.89	0.855	1.7
	Before vs. after	P value	0.001	0.402	0.082
EDV	Before		37.6 ± 11.83	31.8 ± 10.5	35.8 ± 11.4	P = 0.145 F = 1.9 Df :2
	After		41.5 ± 11.13	32.76 ± 8.56	36.7 ± 10.6
	Before vs. after	T value	2.83	0.439	1.06
	Before vs. after	P value	0.008	0.665	0.293
Mean flow velocity	Before		52.94 ± 15.3	44.2 ± 12.4	53.1 ± 13.8	P = 0.04 F = 3.2 Df = 2
	After		58.8 ± 14.45	45.7 ± 10.2	55.1 ± 13.6
	Before vs. after	T value	5.03	0.638	1. 9
	Before vs. after	P value	0.001	0.530	0.06
PI	Before		0.86 ± 0.15	0.94 ± 0.87	0.89 ± 0.10	P = 0.42 F = 0.85 Df = 2
	After		0.83 ± 0.15	0.79 ± 0.13	0.88 ± 0.13
	Before vs. after	T-value	0.75	0.794	0.349
	Before vs. after	P value	0.45	0.436	0.728

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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