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

Table 5

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

BVR type	PMN-SAH	nPMN-SAH	aSAH
Unilateral				0.003	0.021	0.950
A	61 (38.1%)	39 (39.0%)	147 (55.3%)
B	48 (30.0%)	31 (31.0%)	61 (22.9%)
C	51 (31.9%)	30 (30.0%)	58 (22.8%)
Bilateral				0.028	0.066	0.882
AA	15 (18.8%)	9 (18.0%)	50 (37.6%)
AB, BB	26 (32.5%)	16 (32.0%)	38 (28.6%)
AC, BC	26 (32.5%)	19 (38.0%)	32 (24.1%)
CC	13 (16.2%)	6 (12.0%)	13 (9.8%)

BVR: basal vein of Rosenthal; PMN-SAH: perimesencephalic nonaneurysmal subarachnoid hemorrhage; nPMN-SAH: nonperimesencephalic nonaneurysmal subarachnoid hemorrhage.
: statistical analysis was proceeded between PMN-SAH and aSAH group.
: statistical analysis was proceeded nPMN-SAH and aSAH group.
: statistical analysis was proceeded PMN-SAH and nPMN-SAH group.