Role of Extracranial Carotid Duplex and Computed Tomography Perfusion Scanning in Evaluating Perfusion Status of Pericarotid Stenting

Table 3

Changes in carotid duplex and CT perfusion parameters after carotid stenting.

	()	Ipsilateral												Contralateral
			Mean	SD	Median			Min	Max	Change status (number)					Mean	SD	Median			Min	Max	Change status (number)
	Time									Decrease	Increase	The same	value									Decrease	Increase	The same	value
MTT	Before treatment	13	7.06	3.33	6.27	4.29	10.16	3.28	13.06					13	5.74	2.93	5.05	3.59	7.77	3.05	12.07
	After treatment	13	5.46	4.32	3.74	3.51	5.58	3.09	18.66	10	3	0	0.101	13	4.78	2.34	4.15	3.27	5.44	3.16	11.81	7	6	0	0.382
CBF	Before treatment	15	39.89	17.15	42.56	24.50	56.93	13.93	61.56					15	41.62	18.84	38.74	24.41	58.96	11.46	76.91
	After treatment	15	40.65	14.01	39.74	34.90	48.08	5.17	62.60	8	7	0	1.000	15	43.56	20.40	40.78	35.57	47.89	7.86	106.83	7	8	0	0.776
CBV	Before treatment	15	3.02	0.61	2.93	2.66	3.38	1.98	4.39					15	3.00	1.17	3.01	1.96	3.32	1.73	5.79
	After treatment	15	2.63	1.23	2.33	2.15	2.87	1.57	6.73	11	4	0	0.061	15	2.62	1.02	2.38	2.26	2.60	1.38	5.91	9	6	0	0.211
TTP	Before treatment	15	18.89	10.50	12.78	10.08	28.65	8.44	39.28					15	17.91	10.21	10.66	9.22	26.85	8.76	35.30
	After treatment	15	12.17	4.13	11.12	9.32	12.70	9.18	23.60	11	4	0	0.031	15	12.50	2.80	11.71	10.82	13.57	9.72	21.03	9	6	0	0.307
CCA RI	Before treatment	12	0.78	0.14	0.80	0.71	0.89	0.43	0.92					13	0.73	0.06	0.75	0.69	0.77	0.60	0.82
	After treatment	12	0.75	0.08	0.76	0.76	0.79	0.55	0.88	8	2	2	0.202	13	0.77	0.09	0.76	0.74	0.83	0.64	0.92	4	7	2	0.075
ICA RI	Before treatment	12	0.62	0.19	0.62	0.52	0.73	0.24	0.91					11	0.67	0.10	0.70	0.56	0.75	0.52	0.84
	After treatment	12	0.69	0.10	0.70	0.60	0.76	0.58	0.89	3	7	2	0.103	11	0.70	0.07	0.69	0.63	0.78	0.57	0.81	3	7	1	0.220
ECA RI	Before treatment	13	0.84	0.12	0.85	0.80	0.91	0.53	1.00					13	0.87	0.11	0.90	0.80	0.96	0.61	1.00
	After treatment	13	0.80	0.25	0.85	0.79	0.94	0.00	1.00	5	6	2	0.893	13	0.88	0.09	0.91	0.81	0.96	0.75	1.00	6	6	1	0.409

Note. SD, standard deviation; CCA, common carotid artery; ICA, internal carotid artery; ECA, external carotid artery; RI, resistance index; MTT, mean transit time; CBF, cerebral blood flow; CBV, cerebral blood volume; TTP, time to peak.
: percentile 25; : percentile 75.
⁢ value by Wilcoxon signed ranks test.