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Fade Upon TOF Stimulation Induced by Succinylcholine

Primary Purpose

Muscle Relaxants

Status
Completed
Phase
Phase 4
Locations
United States
Study Type
Interventional
Intervention
Succinylcholine
Sponsored by
University of Toledo Health Science Campus
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional other trial for Muscle Relaxants focused on measuring succinylcholine, depolarizing muscle relaxants, pharmacologic effects

Eligibility Criteria

18 Years - 70 Years (Adult, Older Adult)All SexesAccepts Healthy Volunteers

Inclusion Criteria:

  • ASA PS I or II,
  • 18-60 years of age of either sex,
  • with a BMI<25Kg/m2

Exclusion Criteria:

  • presence of any disease involving the neuromuscular system.
  • Presence of any neurologic illness eg . Paraplegia or hemiplegia, spinal cord injuries, stroke, multiple sclerosis.
  • No liver or kidney disease.
  • Known allergy to succinylcholine.
  • Family history of malignant hyperthermia.
  • Known pseudocholinesterase deficiency.
  • Any skin burns within the last 1 year.

We would also exclude subjects with;

  • Central core disease,
  • duchenne or Becker muscular dystrophy,
  • osteogenesis imperfecta,
  • Noonan syndrome,
  • arthrogryposis multiplex,
  • congenital,
  • myotonia,
  • neuroleptic malignant syndrome,
  • multiminicore disease,
  • King Denborough syndrome,
  • Native American myopathy,
  • hypokalemic periodic paralysis or
  • a history of rhabdomyolysis.

We would also exclude any subject with a history of cardiac arrhythmias.

Sites / Locations

  • University of Toledo, Health Science Campus

Arms of the Study

Arm 1

Arm 2

Arm 3

Arm 4

Arm 5

Arm Type

Experimental

Experimental

Experimental

Experimental

Experimental

Arm Label

01 mg/kg

0.15 mg/kg

0.2 mg/kg

0.25 mg/kg

0.3 mg/kg

Arm Description

Succinylcholine 0.1 mg/kg will be administered and TOF ratio measured before and after the administration until stable

Succinylcholine 0.15 mg/kg will be administered and TOF ratio measured before and after the administration until stable

Succinylcholine 0.2 mg/kg will be administered and TOF ratio measured before and after the administration until stable

Succinylcholine 0.25 mg/kg will be administered and TOF ratio measured before and after the administration until stable

Succinylcholine 0.3 mg/kg will be administered and TOF ratio measured before and after the administration until stable

Outcomes

Primary Outcome Measures

Fade on Train of Four Stimulation
We stimulated the ulnar nerve at the wrist four times (over 1.5 seconds) every 20 seconds. We measured the ratio of the fourth contraction to the first contraction before and after the administration of succinylcholine. Before administering succinylcholine the ratio is normally one. After the administration of succinylcholine the first contraction diminishes, but the fourth contraction diminishes even more. This results in a ratio of T4 to T1 being less than one. The lowest ratio recorded after the administration after the administration of succinylcholine is reported as our outcome measure.

Secondary Outcome Measures

Full Information

First Posted
April 14, 2015
Last Updated
December 28, 2017
Sponsor
University of Toledo Health Science Campus
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1. Study Identification

Unique Protocol Identification Number
NCT02425449
Brief Title
Fade Upon TOF Stimulation Induced by Succinylcholine
Official Title
Characterizing Fade Upon Train-of Four Stimulation During Onset and Offset of Neuromuscular Block Produced by Succinlycholine
Study Type
Interventional

2. Study Status

Record Verification Date
December 2017
Overall Recruitment Status
Completed
Study Start Date
April 2015 (undefined)
Primary Completion Date
January 4, 2017 (Actual)
Study Completion Date
January 4, 2017 (Actual)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Principal Investigator
Name of the Sponsor
University of Toledo Health Science Campus

4. Oversight

Data Monitoring Committee
No

5. Study Description

Brief Summary
Muscle relaxants are medications used during surgery to facilitate surgical access. The effect of the muscle relaxant medications is measured by stimulation a motor nerve and measuring the force of the resultant muscle contraction. Based on the mechanism of action, two kinds of muscle relaxants are described. First a nondepolarizing muscle relaxant and the second kind is the depolarizing muscle relaxant. These two kinds of muscle relaxants can be distinguished by rapidly stimulating the nerve 4 times over 2 seconds (Train of four or TOF). The nondepolarizing muscle relaxants produce fade ie successive muscle contractions are less forceful than the preceding ones. Whereas the depolarizing muscle relaxants are generally believed to produce four contractions of equal strength. However, there is some indication that this may not be entirely correct. There is evidence that depolarizing muscle relaxants also may produce fade. The investigators are conducting the following study to determine if indeed depolarizing muscle relaxants produce fade. The investigators would also like to characterize the fade ie differences during onset and offset of the block and the effect of the dose on the degree on the fade.
Detailed Description
Muscle relaxants are frequently employed during anesthesia. These medications may be employed to facilitate tracheal intubation, mechanical ventilation or to allow better surgical access. All muscle relaxants act at the neuromuscular junction. Based on the mechanism of action, two kinds of muscle relaxants have been defined1. Nondepolarizing muscle relaxants are competitive antagonists of the neurotransmitter acetylcholine (Ach) at the neuromuscular junction. The second kind of muscle relaxant is the depolarizing muscle relaxant and succinylcholine is the only muscle relaxant in this class that is clinically used. The mechanism of action of succinylcholine is less clear. Succinylcholine appears to mimic the actions of acetylcholine but results in a longer duration of depolarization of the post synaptic membrane1. The degree of muscle relaxation produced by these muscle relaxants is measured by stimulating a motor nerve and measuring either the force of the muscle contraction produced or its compound muscle action potential (CMAP). As the muscle relaxation increases, the force of muscle contraction or the amplitude of the electromyogram (EMG) is correspondingly reduced. On occasion, to measure the degree of muscle weakness or paralysis caused by a muscle relaxant, instead of a single stimulus, trains of stimuli are applied2. One method of repetitive stimulation is to apply four stimuli over a two second period. This method of nerve stimulation is called Train-of-Four (TOF). When this form nerve stimulation (TOF) is applied to patients who have been given nondepolarizing muscle relaxants -there is fade. Fade means that the force of successive muscle contractions is less than the preceding contraction3. The second contraction is less than the first, the third less than the second and so on. The degree of fade appears to have some reasonably well defined relationship to the degree of relaxation produced3. The classic teaching in the anesthetic literature is that depolarizing muscle relaxants do not produce fade upon repetitive stimulation. It means that upon repetitive stimulation, the successive contractions are similar. This is one of the defining features of a depolarizing block and is called a Phase I block. The traditional teaching is that when a depolarizing muscle relaxant is administered in large or repetitive doses, a Phase II block develops. The phase II block has characteristics similar to those of a nondepolarizing muscle relaxant (ie fade on repetitive or TOF stimulation). De Jong and Freund first proposed that this differentiation between deplolarizing and nondepolarizing block based upon fade may not be as clear cut. These investigators demonstrated that succinylcholine caused fade upon repetitive stimulation right from the outset of the neuromuscular block. Other investigators have also demonstrated that succinylcholine causes fade from the initiation of the neuromuscular block. If it can be conclusively demonstrated that succinylcholine causes fade, then fade would be less useful in differentiating a depolarizing from a nondepolarizing block. We have previously investigated and defined the fade caused by nondepolarizing muscle relaxants. Using the experience we have gained in studying fade with nondepolarizing muscle relaxants, we would like to now define the characteristics of fade (if any) caused by succinylcholine. Method: We intend to enroll fifty healthy adults, 18-60 years of age of either sex who are scheduled to undergo a surgical procedure under general anesthesia. Only subjects with a BMI <25 Kg/m2 will be enrolled. Only subjects free from any hepatic or renal disease will be included. We will exclude any subjects with known allergy to succinylcholine, family history of malignant hyperthermia or any history of skeletal myopathy. We will also exclude subjects that have recently sustained burns, or any illness resulting denervation injury (paraplegia or hemiplegia). The subjects will give an informed consent prior to the participation in the study. All patients will receive 2 mg of midazolam for premedication. Anesthesia will be induced with the intravenous administration of fentanyl 5-6 µg/kg and propofol 2-3 mg/kg. Following tracheal intubation, anesthesia will be maintained with 70% nitrous oxide in oxygen supplemented with an infusion of propofol (120 -150 µg/kg/min). Ventilation will be controlled to maintain normocapnia (end-tidal carbon di oxide 35-40 mmHg). After the commencement of the anesthesia monitoring of neuromuscular transmission will be commenced. Ulnar nerve at the wrist will be stimulated in a TOF sequence (2 Hz every 12 seconds). The resultant force of contraction of the adductor pollicis will be recorded using a mechanomyograph. After obtaining a stable muscle contraction, succinylcholine will be administered. The subjects will be randomly allocated to one of five groups. Group 1 will receive 0.1 mg/kg, group 2 -0.15 mg/kg, group 3 -0.2 mg/kg, group 4 -0.25 mg/kg, group 5 -0.3 mg/kg. Muscle contraction will be recorded until the force of muscle contraction returns to baseline (6-8 minutes). At this time the study will be concluded. Further conduct of the anesthetic will be at the discretion of the subject's primary anesthesiologist. Data Analysis: We intend to plot the force of all four muscle contractions from immediately preceding the injection succinylcholine to complete recovery of the muscle contraction. We would then plot the force of the first twitch (T1) against the ratio of the fourth to the first twitch (T4/T1 ratio) for each individual subject. This plot will allow us to determine if there is any difference in fade characteristics between onset and offset of muscle relaxant effect.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Muscle Relaxants
Keywords
succinylcholine, depolarizing muscle relaxants, pharmacologic effects

7. Study Design

Primary Purpose
Other
Study Phase
Phase 4
Interventional Study Model
Parallel Assignment
Masking
None (Open Label)
Allocation
Randomized
Enrollment
19 (Actual)

8. Arms, Groups, and Interventions

Arm Title
01 mg/kg
Arm Type
Experimental
Arm Description
Succinylcholine 0.1 mg/kg will be administered and TOF ratio measured before and after the administration until stable
Arm Title
0.15 mg/kg
Arm Type
Experimental
Arm Description
Succinylcholine 0.15 mg/kg will be administered and TOF ratio measured before and after the administration until stable
Arm Title
0.2 mg/kg
Arm Type
Experimental
Arm Description
Succinylcholine 0.2 mg/kg will be administered and TOF ratio measured before and after the administration until stable
Arm Title
0.25 mg/kg
Arm Type
Experimental
Arm Description
Succinylcholine 0.25 mg/kg will be administered and TOF ratio measured before and after the administration until stable
Arm Title
0.3 mg/kg
Arm Type
Experimental
Arm Description
Succinylcholine 0.3 mg/kg will be administered and TOF ratio measured before and after the administration until stable
Intervention Type
Drug
Intervention Name(s)
Succinylcholine
Intervention Description
will be administered succinylcholine in a dose of 0.1 mg/kg in Arm 1, 0.15 mg/kg in Arm 2, 0.2 mg/kg in Arm 3, 0.25 mg/kgin Arm 4, 0.3 mg/kg in Arm 5.
Primary Outcome Measure Information:
Title
Fade on Train of Four Stimulation
Description
We stimulated the ulnar nerve at the wrist four times (over 1.5 seconds) every 20 seconds. We measured the ratio of the fourth contraction to the first contraction before and after the administration of succinylcholine. Before administering succinylcholine the ratio is normally one. After the administration of succinylcholine the first contraction diminishes, but the fourth contraction diminishes even more. This results in a ratio of T4 to T1 being less than one. The lowest ratio recorded after the administration after the administration of succinylcholine is reported as our outcome measure.
Time Frame
for the duration of the effect of succinylcholine generally expected to be 6-10 minutes

10. Eligibility

Sex
All
Minimum Age & Unit of Time
18 Years
Maximum Age & Unit of Time
70 Years
Accepts Healthy Volunteers
Accepts Healthy Volunteers
Eligibility Criteria
Inclusion Criteria: ASA PS I or II, 18-60 years of age of either sex, with a BMI<25Kg/m2 Exclusion Criteria: presence of any disease involving the neuromuscular system. Presence of any neurologic illness eg . Paraplegia or hemiplegia, spinal cord injuries, stroke, multiple sclerosis. No liver or kidney disease. Known allergy to succinylcholine. Family history of malignant hyperthermia. Known pseudocholinesterase deficiency. Any skin burns within the last 1 year. We would also exclude subjects with; Central core disease, duchenne or Becker muscular dystrophy, osteogenesis imperfecta, Noonan syndrome, arthrogryposis multiplex, congenital, myotonia, neuroleptic malignant syndrome, multiminicore disease, King Denborough syndrome, Native American myopathy, hypokalemic periodic paralysis or a history of rhabdomyolysis. We would also exclude any subject with a history of cardiac arrhythmias.
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Shashi Bhatt, MD
Organizational Affiliation
University of Toledo
Official's Role
Principal Investigator
Facility Information:
Facility Name
University of Toledo, Health Science Campus
City
Toledo
State/Province
Ohio
ZIP/Postal Code
43614
Country
United States

12. IPD Sharing Statement

Plan to Share IPD
No

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Fade Upon TOF Stimulation Induced by Succinylcholine

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