Hemifacial Spasm and Desflurane

Hemifacial Spasm Clinical Trial

— HFS  

Official title:

Investigating the Etiology of Hemifacial Spasm (HFS): The Role of Desflurane

Clinical Trial Details — Status: Unknown status

Administrative data

• NCT number: NCT01726725
• Other study ID #: B2012:099
• Status: Unknown status
• Phase: N/A
• First received: November 7, 2012
• Last updated: November 15, 2012
• Start date: November 2012
• Est. completion date: December 2013

Study information

• Verified date: November 2012
• Source: University of Manitoba
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

Patients are chosen to participate in this study because they will undergo a particular type of brain surgery to treat their hemifacial spasm. This surgery is called microvascular decompression (MVD) and involves the facial nerve. The facial nerve is being compressed by one or more blood vessels and this contact produces the facial twitches. The investigators do not know why a blood vessel that touches the facial nerve produces facial twitches. The investigators are interested in investigating this during your surgery. A total of 25 participants are expected to participate in this study.

Description:

"Intra Operative Monitoring" (IOM) is a standard and routine medical practice for patients having MVD surgery. IOM is done to make sure that the hearing and face nerves are not accidentally bumped or damaged during surgery. After anesthetic induction, the neurophysiologist places electrodes for the nerves, on the scalp and muscles. Stimulation and monitoring of muscle twitches are all common, safe and painless medical procedures.

In this study, the investigators would like to measure the nerve and muscle function on the normal side and compare it to nerve and muscle function on the abnormal side during different levels of the anesthetic desflurane. In order to monitor the normal side of the face one additional set of electrodes will be placed in the facial muscles. The investigators will compare responses to three different levels of anesthetic. The technique used will be motor evoked potentials. The effect of the anesthesia on the lateral spread response will also be examined. This response is evident only on the symptomatic side. These observations will take approximately 10 to 15 minutes and will not delay or lengthen the surgery.

Recruitment information / eligibility

• Status: Unknown status
• Enrollment: 25
• Est. completion date: December 2013
• Est. primary completion date: December 2013
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 75 Years

Eligibility

Inclusion Criteria:

• patients referred to the neurosurgical service for microvascular decompression surgery for HFS

• males and females 18 to 75 years of age

• otherwise normal neurological exam

• signed informed consent

Exclusion Criteria:

• Botox treatment within the last three months

Related Conditions & MeSH terms

• Hemifacial Spasm
• Muscle Cramp
• Spasm

Intervention

Drug:
• desflurane

Locations

Country	Name	City	State
n/a

Sponsors (1)

Lead Sponsor	Collaborator
University of Manitoba

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Measure EMG responses to peripheral nerve stimulation and motor cortex stimulation during changes in desflurane levels		one year