Table III.

Prognostic factors for surgical failure after first microvascular decompression for hemifacial spasm.

Variable tested	Surgical failure if the variable is present	Surgical failure if the variable is not present	p
Imaging findings
Multiple conflict	3.5%	6.5%	0.402
PICA	5.4%	4.7%	0.999
VA	3.6%	6.4%	0.311
AICA	6.3%	5%	0.722
REZ conflict	4.8%	5.6%	0.604
Endoscopic findings
Multiple conflict	2.6%	7.9%	0.041
PICA	3.6%	10.9%	0.036
VA	2.9%	6.3%	0.203
AICA	3.1%	6.5%	0.218
Vein	18.8%	4.5%	0.045
REZ conflict	3.9%	16%	0.027
Post-operative findings
Nervous complication	7.1%	5.4%	0.230
Mixed nerve palsy	50%	5.3%	0.109

AICA: Antero-Inferior Cerebellar Artery; PICA: Postero-Inferior Cerebellar Artery; REZ: Root Exit Zone; VA: Vertebral Artery