Table 2:

Summary of differences in TTP and degree of CBF and CBV reduction of the affected hemisphere relative to the unaffected hemisphere in the cerebellum and cerebrum in CCD+ cases (n = 20)*†

	ΔTTP Cerebellum (sec)	ΔTTP Cerebrum (sec)	% CBF Reduction Cerebellum	% CBF Reduction Cerebrum	% CBV Reduction Cerebellum	%CBV Reduction Cerebrum
Mean	2.02	4.98	22.75	31.33	6.39	−7.69
Median	1.60	4.48	19.27	28.65	8.75	−1.78
SD	1.29	3.10	10.94	17.71	17.56	18.81
Minimum	0.38	0.82	7.45	4.76	−39.33	−60.06
Maximum	4.53	12.39	52.13	76.35	37.92	18.63
P	.001		.07

Note:—sec indicates second; CBF, cerebral blood flow; CBV, cerebral blood volume.
* t test: 2-tail, 2-sample assuming unequal variances.
† Note that calculation of CBF and CBV reduction assumes that these values are reduced in the affected hemisphere (ie, the cerebral hemisphere of acute infarction, or cerebellar hemisphere contralateral to the supratentorial infarction). ΔTTP therefore shows increase, and CBF shows reduction in the affected cerebrum and contralateral cerebellum. CBV, however, shows a wide range of values that are increased, unchanged, or decreased, but with a mean of modest reduction in the contralateral cerebellum (6.39 ± 17.56%) and modest net increase in the cerebrum (−7.69 ± 18.81%).