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TABLE 2: Difference in CCA Doppler parameters between patients with and without each intracranial collateral
Side-to-side ratio ACoA PCoA OA LM
(56/25) P (19/62) P (21/60) P (14/67) P
PSV 1.32 ± 0.43 NS 1.30 ± 0.30 NS 1.38 ± 0.38 NS 1.40 ± 0.42 NS
1.17 ± 0.37 1.27 ± 0.45 1.24 ± 0.42 1.25 ± 0.41 
EDV 1.63 ± 0.59 .0005 1.81 ± 0.65 .004 2.00 ± 0.66 <.0001 1.88 ± 0.84 .004
1.18 ± 0.29 1.39 ± 0.49 1.31 ± 0.39 1.41 ± 0.45 
TMV 1.47 ± 0.52 .009 1.57 ± 0.57 .05 1.64 ± 0.44 .003 1.51 ± 0.51 NS
1.18 ± 0.28 1.33 ± 0.43 1.29 ± 0.45 1.36 ± 0.47 
PI 0.90 ± 0.28 NS 0.88 ± 0.30 NS 0.91 ± 0.32 NS 0.97 ± 0.29 NS
1.00 ± 0.22 0.95 ± 0.25 0.94 ± 0.24 0.92 ± 0.26 
RI 0.95 ± 0.11 .01 0.95 ± 0.12 NS 0.95 ± 0.13 NS 0.95 ± 0.13 NS
1.01 ± 0.08 0.97 ± 0.10 0.97 ± 0.09 0.97 ± 0.09 
Note.—ACoA indicates anterior communicating artery; PCoA, posterior communicating artery; OA, ophthalmic artery; and LM, leptomeningeal collateral. The number in parenthesis indicates the number of the patients with/without each collateral. The side-to-side ratios of Doppler parameters are described in the Table. Upper and lower columns indicate the ratio in patients with and without the collaterals, respectively; P value under .05 is considered to be significant; and NS represents not significant.