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FIG 1. Postoperative digital subtraction angiograms and changes in pulsed Doppler ultrasonographic images of STA.
A, Postoperative digital subtraction angiograms. Pattern of collateral circulation through bypass was graded based on the findings of a postoperative angiogram of the external carotid artery.
B, Preoperative images of affected side.
C, Preoperative images of nonaffected side.
D, Postoperative images of affected side.
E, Postoperative images of nonaffected side.
Doppler wave forms of STA in a patient with extensive (top), moderate (middle), and poor (bottom) bypass flow are also shown. The vertical axis represents the flow velocity (in cm/s). Note that the postoperative EDV of the affected STA increased in patients with more extensive bypass flow. The postoperative EDV ratios of the anastomosed STA to the contralateral one was 3.9 (top), 2.1 (middle), and 1.5 (bottom), respectively.
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