Balloon test occlusion of internal carotid artery: Angiographic findings predictive of results

Table 1 Results of anterior cerebral artery visualization by cross flow and the balloon test occlusion outcome

ACA visualization		BTO-positive (%)	BTO-negative (%)	Total (%)
Poor	Grade 0	2 (5)	0 (0)	2 (5)
	Grade 1	0 (0)	0 (0)	0 (0)
	Grade 2	1 (2)	1 (2)	2 (5)
Good	Grade 3	0 (0)	5 (12)	5 (12)
	Grade 4	2 (5)	31 (74)	33 (78)
Total		5 (12)	37 (88)	42 (100)

Significant differences (P = 0.0051; 95%CI: 0.13-7.61) was seen between the ACA visualization and the BTO outcome. ACA: Anterior cerebral artery; BTO: Balloon test occlusion.

Table 2 Results of middle cerebral artery visualization by cross flow and the balloon test occlusion outcome

MCA visualization		BTO-positive (%)	BTO-negative (%)	Total (%)
Poor	Grade 0	3 (7)	1 (2)	4 (9)
	Grade 1	1 (2)	0 (0)	1 (2)
	Grade 2	1 (2)	3 (7)	4 (9)
Good	Grade 3	0 (0)	12 (29)	12 (29)
	Grade 4	0 (0)	21 (50)	21 (50)
Total		5 (12)	37 (88)	42 (100)

Significant differences (P = 0.0002; 95%CI: 0.07-14.19) was seen between the MCA visualization and the BTO outcome. MCA: Middle cerebral artery; BTO: Balloon test occlusion.

Table 3 Circle of Willis anatomy and the balloon test occlusion outcome

COW anatomy		BTO-positive (%)	BTO-negative (%)	Total (%)
Poorly-	Type 0	2 (5)	0 (0)	2 (5)
developed	Type 1	3 (7)	3 (7)	6 (14)
Well-	Type 2	0 (0)	4 (10)	4 (10)
developed	Type 3	0 (0)	30 (71)	30 (71)
Total		5 (12)	37 (88)	42 (100)

Significant differences (P < 0.0001; 95%CI: 0.31-3.21) was seen between the COW anatomy and the BTO outcome. COW: Circle of Willis; BTO: Balloon test occlusion.