COVID-19 is an emerging, rapidly evolving situation.
Get the latest public health information from CDC:

Get the latest research information from NIH: Menu

Hemifacial Spasm and Desflurane (HFS)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01726725
Recruitment Status : Unknown
Verified November 2012 by University of Manitoba.
Recruitment status was:  Enrolling by invitation
First Posted : November 15, 2012
Last Update Posted : November 16, 2012
Information provided by (Responsible Party):
University of Manitoba

Brief 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.

Condition or disease Intervention/treatment
Hemifacial Spasm Drug: desflurane

Detailed 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.

Layout table for study information
Study Type : Observational
Estimated Enrollment : 25 participants
Observational Model: Case Control
Time Perspective: Prospective
Official Title: Investigating the Etiology of Hemifacial Spasm (HFS): The Role of Desflurane
Study Start Date : November 2012
Estimated Primary Completion Date : December 2013
Estimated Study Completion Date : December 2013

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Muscle Cramps
Drug Information available for: Desflurane

Group/Cohort Intervention/treatment
hemifacial spasm, lateral spread, motor evoked potentials
EMG recordings from facial muscles of HFS patients during MVD surgery will be compared during total intravenous anesthesia (propofol), 0.5 MAC desflurane and 1.0 MAC desflurane
Drug: desflurane

Primary Outcome Measures :
  1. Measure EMG responses to peripheral nerve stimulation and motor cortex stimulation during changes in desflurane levels [ Time Frame: one year ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   18 Years to 75 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
Patients diagnosed with hemifacial spasm who will be undergoing microvascular decompression surgery

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

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01726725

Sponsors and Collaborators
University of Manitoba
Layout table for investigator information
Principal Investigator: Marshall Wilkinson, PhD University of Manitoba

Layout table for additonal information
Responsible Party: University of Manitoba Identifier: NCT01726725    
Other Study ID Numbers: B2012:099
First Posted: November 15, 2012    Key Record Dates
Last Update Posted: November 16, 2012
Last Verified: November 2012
Keywords provided by University of Manitoba:
hemifacial spasm
microvascular decompression surgery
Additional relevant MeSH terms:
Layout table for MeSH terms
Muscle Cramp
Hemifacial Spasm
Neuromuscular Manifestations
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms
Muscular Diseases
Musculoskeletal Diseases
Mouth Diseases
Stomatognathic Diseases
Anesthetics, Inhalation
Anesthetics, General
Central Nervous System Depressants
Physiological Effects of Drugs