Determination of Target of Adequate Partial Neuromuscular Blockade for Electrophysiologic Monitoring During Microvascular Decompression Surgery

Determination of Target of Adequate Partial Neuromuscular Blockade With Sevoflurane Anesthesia for Electrophysiologic Monitoring During Microvascular Decompression Surgery

There have been reports of monitoring LSR during MVD surgery helps predicting the clinical outcome of MVD. However, there have been no evidence of which degree of partial neuromuscular blockade should be performed during LSR monitoring under sevoflurane anesthesia. Therefore, the investigators performed a randomized controlled trial to evaluate the effect of different degree of partial neuromuscular blockade on the LSR monitoring for MVD surgery.

Study Overview

• Status: Completed
• Conditions: Neuromuscular Blockade; Hemifacial Spasm; Microvascular Decompression
• Intervention / Treatment: Other: T1/Tc guided partial NMB; Other: TOF count-guided partial NMB

Detailed Description

Hemifacial spasm develops by vascular compression of facial nerve at the root exit zone from brain stem. Microvascular decompression (MVD) is known for its curative treatment. Lateral spread response (LSR) is a kind of pathologic electromyographic (EMG) wave form which develops when facial nerve is compressed by vessel. There have been reports of monitoring LSR during MVD surgery helps predicting the clinical outcome of MVD.

As neuromuscular blockade during LSR monitoring decreases the amplitude of EMG, partial neuromuscular blockade is usually maintained during general anesthesia for MVD. However, there have been no evidence of which degree of partial neuromuscular blockade should be performed during LSR monitoring under sevoflurane anesthesia. Therefore, the investigators performed a randomized controlled trial to evaluate the effect of different degree of partial neuromuscular blockade on the LSR monitoring for MVD surgery.

• Study Type: Interventional
• Enrollment (Actual): 61
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Korea, Republic of
  • Seoul, Korea, Republic of, 135-710
    • Samsung Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 20 years to 70 years (ADULT, OLDER_ADULT)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Those who undergo microvascular decompression with sevoflurane anesthesia by diagnosis of hemifacial spasm in our institution

Exclusion Criteria:

• Patients were excluded from the study if they had any of following: severe cardiopulmonary disorder with hemodynamic unstability (pulmonary hypertension, cardiomyopathy, mechanical ventilation, American Society of Anesthesiologists physical status III or more), severe hepatic or renal disease.
• Those who can not undergo MEP monitoring due to central or peripheral neuromuscular disease, e.g. cerebral palsy, myasthenia gravis, acute spinal injury, neurologic shock

Study Plan

How is the study designed?

Design Details

• Allocation: RANDOMIZED
• Interventional Model: PARALLEL
• Masking: SINGLE

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
ACTIVE_COMPARATOR: T1/Tc amplitude-guided group; Using partial neuromuscular blockade to maintain T1/Tc amplitude of 50%, T1/Tc amplitude measured by the neuromuscular transmission module (NMT)	Other: T1/Tc guided partial NMB; Using partial neuromuscular blockade to maintain T1/Tc amplitude of 50%, T1/Tc amplitude measured by the neuromuscular transmission module (NMT); Other Names: neuromuscular transmission module (NMT)
ACTIVE_COMPARATOR: TOF count-guided group; Using partial neuromuscular blockade to maintain train-of-four response of two, TOF response measured by the neuromuscular transmission module (NMT module)	Other: TOF count-guided partial NMB; TOF count-guided partial NMB Using partial neuromuscular blockade to maintain train-of-four response of two, TOF response measured by the neuromuscular transmission module (NMT module); Other Names: neuromuscular transmission module (NMT module)

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Lateral spread response	Lateral spread response of electromyography measured by electrophysiologist at baseline (30 min after anesthetic induction)	baseline (30 min after anesthetic induction)
Lateral spread response	Lateral spread response of electromyography measured by electrophysiologist before dura opening	before dura opening (45 minute after anesthetic induction)
Lateral spread response	Lateral spread response of electromyography measured by electrophysiologist after dura opening (one hour after anesthetic induction)	after dura opening (60 min after anesthetic induction)
Lateral spread response	Lateral spread response of electromyography measured by electrophysiologist before facial nerve decompression (90 minutes after anesthetic induction)	before facial nerve decompression (90 minutes after anesthetic induction)
Lateral spread response	Lateral spread response of electromyography measured by electrophysiologist after facial nerve decompression (2 hour after anesthetic induction)	after facial nerve decompression (120 min after anesthetic induction)
Lateral spread response	Lateral spread response of electromyography measured by electrophysiologist after dura closure (150 min after anesthetic induction)	after dura closure (150 min after anesthetic induction)

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Train-of-four response	Train-of-four response to ulnar nerve electrical stimulation measured by NMT module at six time-points; Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)	Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)
T1/Tc amplitude	T1/Tc amplitude as a reponse to ulnar nerve stimulation measured by NMT module at six time points; Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)	Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)
incidence of patients' spontaneous movements or respiration	incidence of patients' spontaneous movements or respiration measured by anesthesiologists or reported by surgeon at six time points; Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)	Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)
Mean blood pressure (mmHg)	mean blood pressure measured by anesthesiologists at six time points; Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)	Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)
heart rate (beats/min)	heart rate measured by anesthesiologists at six time points; Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)	Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)
pulse oximetry (oxygen saturation, %)	pulse oximetry measured by anesthesiologists at six time points; Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)	Baseline (30min), Before dura open (45 min), After dura open (60 min), Before decompression (90 min), After decompression (120 min), After dura close (150 min after anesthetic induction)

Collaborators and Investigators

• Sponsor: Samsung Medical Center

Study record dates

Study Major Dates

• Study Start: June 1, 2012
• Primary Completion (ACTUAL): February 1, 2013
• Study Completion (ACTUAL): February 1, 2013

Study Registration Dates

• First Submitted: June 5, 2012
• First Submitted That Met QC Criteria: June 6, 2012
• First Posted (ESTIMATE): June 7, 2012

Study Record Updates

• Last Update Posted (ESTIMATE): December 25, 2013
• Last Update Submitted That Met QC Criteria: December 24, 2013
• Last Verified: December 1, 2013

More Information

Terms related to this study

• Keywords: electromyography; hemifacial spasm; neuromuscular blockade; microvascular decompression
• Additional Relevant MeSH Terms: Nervous System Diseases; Neurologic Manifestations; Stomatognathic Diseases; Mouth Diseases; Neuromuscular Manifestations; Spasm; Hemifacial Spasm
• Other Study ID Numbers: 2012-05-051