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

Not Applicable

Completed

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

• Registration Number: NCT01613781
• Lead Sponsor: Samsung Medical Center

Brief Summary

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.

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.

Basic Information
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Recruitment & Eligibility
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Study & Design
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Trial Locations

Study Timeline

• Study Start: 2012-06
• Study First Submitted: 2012-06-05
• Study First Submitted QC: 2012-06-06
• Study First Posted: 2012-06-07
• Primary Completion: 2013-02
• Study Completion: 2013-02
• Status Verified: 2013-12
• Last Update Submitted: 2013-12-24
• Last Update Posted: 2013-12-25

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 61

Inclusion Criteria

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

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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

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
T1/Tc amplitude-guided group	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)
TOF count-guided group	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)

Primary Outcome Measures

Name	Time	Method
Lateral spread response	after dura closure (150 min after anesthetic induction)	Lateral spread response of electromyography measured by electrophysiologist after dura closure (150 min after anesthetic induction)

Secondary Outcome Measures

Name	Time	Method
Train-of-four response	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)	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)
T1/Tc amplitude	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 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)
incidence of patients' spontaneous movements or respiration	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 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)
Mean blood pressure (mmHg)	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 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)
heart rate (beats/min)	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 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)
pulse oximetry (oxygen saturation, %)	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 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)

Trial Locations

Locations (1)

Samsung Medical Center; 🇰🇷 Seoul, Korea, Republic of