What is it about?
The loss of LSR in MVD surgery is a very important test to prove that the operation is well done. However, even if surgery is successful, the LSR often does not disappear. One of the reasons is that it stimulates the stimulus in the direction of Brainstem. It is known that in the normal population, the zygomatic branch and the side branch of the buccal branch are connected to each other. So if you give the stimulus direction as Brainstem, there will be a lot of stimuli in the lower branch even if the stimulus is given to the upper branch. In these cases, the LSR will not be lost regardless of the success of the operation.
Featured Image
Why is it important?
Residual LSRs or Persistant LSRs are known to be around 15-25%, which is called LSR. If the LSR stimulus is directed in the opposite direction of Brainstem, even if there is a lot of connectivity between the zygomatic branch and the buccal branch, only the upper branch or the lower branch can be excited independently. By doing this, we can observe about 3% residual LSR. Since the LSR is lost 97% during the operation, Surgeon can confirm the success or failure of the operation and prevent unnecessary operation due to LSR which is not lost and to prevent hearing loss.
Perspectives
Although the LSR is terminated without being lost during surgery, the postoperative state of the patient is often improved. Conversely, even if the LSR is lost during surgery, the patient's condition after surgery is very often observed. We hope that this study will further improve the quality of LSR measurements.
Sang Ku Park
Department of Neurosurgery, Konkuk University Medical Center, 120-1 Neungdong-ro, Gwangjin-ku, Seoul, Korea
Read the Original
This page is a summary of: A new method for monitoring abnormal muscle response in hemifacial spasm: A prospective study, Clinical Neurophysiology, March 2018, Elsevier,
DOI: 10.1016/j.clinph.2018.03.006.
You can read the full text:
Contributors
The following have contributed to this page
