Table 4:

Pre- and postinitiation of chronic transfusion therapy ASL perfusion changes^a

Pt	Pretransfusion							Posttransfusion							P Value
	MCA (R)	MCA (L)	ACA (R)	ACA (L)	PCA (R)	PCA (L)	Avg	MCA (R)	MCA (L)	ACA (R)	ACA (L)	PCA (R)	PCA (L)	Avg
1	96	NA	78	NA	93	NA	89	95	NA	94	NA	87	NA	92	.69
2	79	71	64	65	62	73	69	NA	87	NA	84	NA	80	84	.06
3	103	91	102	98	111	107	102	75	78	76	76	73	75	76	<.001b
4	NA	89	NA	80	NA	80	83	NA	75	NA	82	NA	76	78	.37
5	90	96	81	93	82	88	88	93	96	95	101	91	93	95	.02c
6	84	102	88	100	78	83	90	79	96	81	86	78	76	83	.02b
7	98	93	88	90	92	88	92	81	84	74	85	74	83	81	.005b
8	70	68	70	65	65	64	67	74	79	64	71	60	60	68	.74
9	70	70	64	66	63	71	67	69	74	77	85	73	80	87	.02c
T	86	78	79	82	81	82	81	81	84	80	80	77	78	80	.47

Note:—Pt indicates patient; R, right; L, left; Avg, average/mean whole-brain CBF; NA, not applicable/excluded; T, mean of each arterial territory.

^aArterial territory–specific and mean whole-brain CBF values (in milliliters/100 g of tissue/min) from 9 patients with transfusion prior to (left columns) and at the first scan after (right columns) transfusion initiation. In the interest in space and simplicity, CBF values were rounded to the nearest whole number for this display.

^bSignificant.

^cSignificant increase in mean whole-brain CBF.