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

Table 3 Duplex parameters of anterior cerebral artery (ACA) 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		61.5 ± 14.18	60.4 ± 13.8	59.3 ± 13.5	P = 0.44 F = 0.82 Df = 2
	After mean ± SD		63.9 ± 14.84	63.3 ± 14.03	60.1 ± 13.7
	Before vs. after	T value	1.77	1.419	1.125
	Before vs. after	P value	0.08	0.169	0.266
EDV	Before mean ± SD		25.8 ± 6.2	27.2 ± 8.5	23.4 ± 6.4	P = 0.076 F = 2.6 Df = 2
	After mean ± SD		29.18 ± 7.5	27.4 ± 8.4	24.5 ± 6.5
	Before vs. after	T value	3.68	0.270	1.6
	Before vs. after	P value	0.001	0.911	0.111
Mean	Before mean ± SD		37.74 ± 7.9	38.3 ± 9.5	35.4 ± 8.05	P = 0.21 F = 1.6 Df = 2
	After mean ± SD		40.7 ± 9.1	39.3 ± 9.8	36.6 ± 8.1
	Before vs. after	T value	3.48	0.520	1.9
	Before vs. after	P value	0.001	0.487	0.06
PI	Before mean ± SD		0.87 ± 0.19	0.9 ± 0.21	0.91 ± 0.14	P = 0.32 F = 1.13 Df = 2
	After mean ± SD		0.76 ± 0.15	0.86 ± 0.16	0.86 ± 0.17
	Before vs. after	T value	2.4	1.053	1.8
	Before vs. after	P value	0.019	0.303	0.072

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

ISSN: 1471-2377