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TABLE 2: Venous drainage delay assessed by angiography during balloon test occlusion in 60 patients undergoing permanent internal carotid artery occlusion
Venous Drainage Delay^* 0 Seconds 1 Second 2 Seconds 3 Seconds Total
Aneurysms 26 6 2 1 35
Tumors 16 4 1 2 23
Direct fistulae 2 0 0 0 2
Total 44 10 3 3 60
* Beginning of venous phase is determined by appearance of first cortical veins at the angiogram. Venous drainage delay corresponds to cortical vein–filling delay of the occluded territory compared to the injected artery (contralateral internal carotid artery or dominant vertebral artery).

Venous Drainage Delay^*	0 Seconds	1 Second	2 Seconds	3 Seconds	Total
Aneurysms	26	6	2	1	35
Tumors	16	4	1	2	23
Direct fistulae	2	0	0	0	2
Total	44	10	3	3	60