The Effect of Local Anaesthetic Volume on Nerve Block Duration and Nerve Block Duration Variability

Postoperative Pain Clinical Trial

Official title:

The Effect of Local Anaesthetic Volume on Nerve Block Duration and Nerve Block Duration Variability. A Randomised, Blinded, Healthy Volunteer Study

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02829697
• Other study ID #: H-16000184
• Status: Completed
• Phase: Phase 4
• First received: July 8, 2016
• Last updated: March 20, 2017
• Start date: July 2016
• Est. completion date: March 20, 2017

Study information

• Verified date: March 2017
• Source: Nordsjaellands Hospital
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The aim is to investigate the effect of perineural administration of a series of different volumes of local anaesthesia (ropivacaine 0.2%) on nerve block duration and the variability of the duration in the common peroneal nerve and the sciatic nerve in healthy volunteers.

The hypothesis is that nerve block duration is correlated to local anaesthetic volume, but only to a certain degree. After a sufficient volume a 'saturation level' will be reached, and nerve block duration will not increase further.

Description:

The trial is divided into two similar phases. Each phase will focus on a specific nerve. Phase 1 will focus on the common peroneal nerve and Phase 2 will focus on the sciatic nerve.

After baseline measurements, the investigators will insert a peripheral intravenous catheter. Then, the investigators will insert a suture-method peripheral nerve catheter (Certa CatheterTM). Procedures will be done in a sterile manner as a standard of practice. The investigators will use an ultrasound (US)-guided short-axis, needle in-plane technique. For the US-scan, the investigators will use a linear or a curvilinear transducer.

During interventions, volunteers will be monitored with continuous pulse oximetry. Placement of the peripheral nerve catheter will be facilitated by US using small injections of mepivacaine (carbocaine 2 %) in the skin and surrounding tissues and only isotonic saline (5 mL) in the perineural space to prevent blocking of the nerve before ropivacaine injection. The catheter orifice will be placed by pulling either end of the catheter and guided by the built-in echogenic markings seen on US. Before injection of ropivacaine, the investigators will do careful aspirations through the catheter in order to prevent intravasal injection.

Each ropivacaine injection will be administered via an infusion pump. This will ensure a constant infusion rate set to 10 mL per minute. During infusion, the volunteers will be monitored with continuous pulse oximetry.

Before instigation of the ropivacaine infusion, the investigators will use US to verify full absorption of the isotonic saline in the perineural space.

For each nerve, the subject will be randomly allocated to and receive one of five possible ropivacaine volumes. All volunteers and outcome assessors will be blinded to the ropivacaine administrations and infusion procedures. Outcome assessors will not be in the room, when the medication is prepared nor given. Preparation will take place behind a curtain and therefore also blinded to the volunteers.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 120
• Est. completion date: March 20, 2017
• Est. primary completion date: March 20, 2017
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 64 Years

Eligibility

Inclusion criteria

1. Male or female 18-64 years

2. American Society of Anesthesiologists Classification = II

Exclusion criteria

1. Body Mass Index = 18 or = 30

2. Former surgery to the lower extremities

3. Peripheral nerve disease

4. Allergy to ropivacaine

5. Pregnancy or breastfeeding

6. Enrolment in other investigational drug studies or recent clinical trials that may interfere with this study

7. Habitual use of any kind of analgesic treatment

8. Anatomic abnormalities preventing successful US-guided peripheral nerve catheter insertion

Related Conditions & MeSH terms

• Pain, Postoperative
• Postoperative Pain

Intervention

Drug:
• Ropivacaine
Perineural injection.

Locations

Country	Name	City	State
Denmark	Claus Behrend Christiansen	Hillerød

Sponsors (2)

Lead Sponsor	Collaborator
Nordsjaellands Hospital	Innovation Fund Denmark

Country where clinical trial is conducted

Denmark, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Duration of sensory nerve block	Application of a round, cooled glass container in the sensory distribution area of the tested nerve: The lateral part of the lower leg for the common peroneal nerve and beneath the foot for the tibial nerve. Testing will start after onset of sensory nerve block and continue until normal sensation has returned. When testing the sciatic nerve, we will continue testing until normal sensation has returned in both components of the nerve, i.e. the tibial and common peroneal nerve.	1-24 hours
Secondary	Length of nerve exposed to local anaesthesia	We will measure local anaesthetic spread in a proximal-to-distal manner parallel to the nerve trajectory. Total length of the neural spread will be reported in millimetres from the most proximal point to the most distal point in which fluid, i.e. ropivacaine, is seen on ultrasound in proximity to the nerve. Testing will be done immediately after end of ropivacaine infusion.	10 minutes
Secondary	Onset of sensory nerve block	Application of a round, cooled glass container in the sensory distribution area of the tested nerve: The lateral part of the lower leg for the common peroneal nerve and beneath the foot for the tibial nerve. Testing will start ten minutes after end of infusion and continue for every fifth minute until onset. We will test for a maximum of 180 minutes.	10-180 minutes
Secondary	Onset of motor nerve block	Testing will start ten minutes after end of infusion and continue for every fifth minute until onset. When onset of sensory nerve block is confirmed, testing of motor nerve block onset will end as well, if not already found. Motor nerve block of the tibial nerve will be evaluated by plantarflexion of the ankle. Motor nerve block of the common peroneal nerve will be tested by dorsiflexion of the ankle.	10-180 minutes
Secondary	Degree of sensory nerve block	We will test sensory nerve block using a subjective rating scale. We will grade from one to four: 1) "not different from ipsilateral antebrachium"; 2) "different from ipsilateral antebrachium"; 3) "warm sensation"; 4) "no sensation". Grades 2-4 will be considered as successful sensory nerve blocks. It will be noted if the volunteer is in doubt. Nevertheless, this will be considered as a successful sensory nerve block and graded as 2) in the post hoc statistical analyses.	1-24 hours
Secondary	Degree of motor nerve block	This will be tested with the volunteer in the upright position using a sturdy counter for balance if necessary. Motor strength will be evaluated using a normal everyday activation of the lower leg: A toe and a heel raise, testing the common peroneal nerve via activation of the anterior tibial muscle and the tibial nerve via activation of the gastrocnemius muscle, respectively. Motor nerve block intensity will be evaluated on a scale from one to three: 1) normal strength, 2) paresis or 3) paralysis. Volunteers will be asked to perform a maximum contraction building up muscle force over three seconds. It will be noted if the volunteer is in doubt, which will be considered as 2) paresis in the post hoc statistical analyses.	1-24 hours