Although intraoperative EMG monitoring during Microvascular decompression for hemifacial spasm was beneficial for identifying the offending vessel and suggesting the most appropriate surgical end point, loss of LSR did not always correlate with long-term HFS treatment outcome. Because the HFS cure rate improved over time, revision might be considered for persistent LSR when follow-up has been performed for more than 1 year and the spasm remains despite adequate decompression 1).
1)
Lee SH, Park BJ, Shin HS, Park CK, Rhee BA, Lim YJ. Prognostic ability of
intraoperative electromyographic monitoring during microvascular decompression
for hemifacial spasm to predict lateral spread response outcome. J Neurosurg.
2016 Apr 22:1-6. [Epub ahead of print] PubMed PMID: 27104851.