Management of Spontaneous Subarachnoid Hemorrhage Patients with Negative Initial Digital Subtraction Angiogram Findings: Conservative or Aggressive?

Table 6

Type of BVR in nonaneurysmal subarachnoid hemorrhage and aneurysmal subarachnoid hemorrhage patients.

Author/year	Unilateral BVR type						Bilateral BVR type
	PMN-SAH (%)			aSAH (%)			PMN-SAH (%)				aSAH (%)
	A	B	C	A	B	C	AA	AB; BB	AC; BC	CC	AA	AB; BB	AC; BC	CC
Watanabe et al. [17]/2002	3 (25)	2 (17)	7 (58)	79 (41)	70 (37)	42 (22)	0	NS	NS	NS	22 (22)	NS	NS	NS
Alén et al. [18]/2008	36 (24)	66 (44)	47 (32)	116 (59)	51 (26)	31 (15)	12 (13)	41 (45)	38 (42)		54 (48)	34 (30)	24 (21)
van der Schaaf et al. [19]/2008	21 (19)	48 (43)	21 (37)	49 (58)	26 (31)	9 (11)	4 (7)	NS	NS	29 (53)	15 (36)	NS	NS	8 (19)
Yamakawa et al. [20]/2008	10 (29)	7 (20)	18 (51)	111 (57)	61 (31)	23 (12)	2 (11)	NS	NS	NS	32 (29)	NS	NS	NS
Daenekindt et al. [21]/2008	49 (42)	34 (30)	32 (28)	50 (46)	31 (29)	27 (25)	13 (22)	18 (31)	28 (47)		10 (17)	28 (47)	21 (36)
Song et al. [22]/2010	NS	NS	NS	NS	NS	NS	10 (31)	8 (25)	8 (25)	6 (19)	34 (60)	12 (21)	9 (16)	2 (4)
Kawamura et al. [23]/2011	6 (32)	8 (42)	5 (26)	33 (49)	27 (35)	7 (10.4)	0	5 (50)	3 (30)	1 (10)	14 (42)	12 (36)	7 (21)
Sabatino et al. [24]/2014	36 (46)	31 (39)	12 (15)	50 (66)	8 (11)	18 (24)	NS	NS	NS	NS	NS	NS	NS	NS
Buyukkaya et al. [12]/2014	NS	NS	NS	NS	NS	NS	14 (35)	3 (9)	12 (34)	6 (17%)	26 (74)	5 (14)	3 (9)	1 (3)

PMN-SAH: perimesencephalic nonaneurysmal subarachnoid hemorrhage; aSAH: aneurysmal subarachnoid hemorrhage; NS means no data was recorded. The idiopathic subarachnoid hemorrhage has not been described in detail; no group was divided.