Magnetic Resonance Imaging of Interscalene Plexus Block
Information source: Paracelsus Medical University
ClinicalTrials.gov processed this data on August 23, 2015 Link to the current ClinicalTrials.gov record.
Condition(s) targeted: Disorder of Shoulder
Intervention: Interscalene Nerve Block (Procedure); Ropivacaine 0.75%, 20ml (Drug); Gadopentetate-Dimeglumine 0.0125 mmol (Drug); Gadopentetate-Dimeglumine 0.05 mmol (Drug); Ropivacaine 0.75%, 5ml (Drug); Shoulder Surgery (Procedure)
Phase: Phase 4
Status: Completed
Sponsored by: Paracelsus Medical University Official(s) and/or principal investigator(s): Peter Gerner, MD, Study Chair, Affiliation: Department of Anesthesiology, Perioperative Medicine and Intensive Care, Paracelsus Medical University, Salzburg, Austria Gerhard Fritsch, MD, Principal Investigator, Affiliation: Department of Anesthesiology, Perioperative Medicine and Intensive Care, Paracelsus Medical University, Salzburg, Austria
Summary
Interscalene plexus block is a widely used technique to provide anesthesia and analgesia for
surgery at the upper extremity (shoulder and upper arm); it is standard-of-care in many
institutions worldwide. Local anesthetic is being injected around the nerves supplying the
arm (Plexus brachialis) at a specific location in the arm (between the scalenus muscles,
thus called "interscalene plexus block"). The optimal volume of injection with regard to
efficacy, safety and avoidance of untoward effects has been subject to intense debate for a
long time. In spite of evidence that small volumes (between 5 and 7 mls) are effective for
adequate postoperative analgesia, larger volumes up to 40 mls are still frequently used in
many practices. However, with the use of such large doses, adverse events are known to occur
with increased frequency, including paralysis of the diaphragm or spread of local anesthetic
to the spinal cord.
This study is intended to help evaluate the effects of small or larger injection of local
anesthetic around the brachial plexus, and to correlate the distribution with clinical
efficacy, block duration, and possible side effects. It is a randomized, controlled,
observer-blinded trial; patients undergoing shoulder or upper arm surgery will be randomly
allocated to receive either 5mls or 20mls of local anesthetic for their interscalene plexus
block. Magnetic resonance imaging will be performed immediately afterwards, followed by a
series of neurological exams during the hospital stay. Test of lung function (spirometry)
and ultrasound of the diaphragm will be used to evaluate effects of the block on respiratory
mechanics.
Clinical Details
Official title: Magnetic Resonance Imaging of Local Anesthetic Distribution: A Comparison of 5 and 15 Milliliters of Ropivacaine 0,75% for Ultrasound Guided Interscalene Plexus Blockade
Study design: Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Treatment
Primary outcome: Spread of local anesthetics to the epidural space
Secondary outcome: Contralateral epidural spreadSpread of local anesthetics to the phrenic nerve Bed side spirometry and ultrasound investigation of the diaphragm in the PACU Oxygen saturation in the PACU Self-reported block duration Self reported pain scores for the first 24 postoperative hours Time to first analgesic consumption on demand Total analgesic consumption (ropivacaine PCA).
Detailed description:
Background: Interscalene plexus blockade (ISB) is frequently used during surgery of the
upper limb. The use of ultrasound has significantly reduced time of onset and total volume
of local anesthetics in comparison to nerve localization by stimulators. (1-4) The
introduction of this technique has been correlated with decreased volumes of effective local
anesthetics from 40 milliliters and more down to 10 milliliters and less.(3-4) As the
injection site of ISB is located in close proximity to the anatomical structures of the
spinal cord, spread of local anesthetics could potentially cause adverse events, including
contralateral blockade and total spinal anesthesia. Case reports on these complications have
been published previously. (5-11)In a recently published study we showed that the phenomenon
of epidural spread can be reproduced in cadavers and seems to be positively correlated to
injection-volumes exceeding 10 milliliters.(12) Moreover, we observed a trend towards
cranial spread of the contrast agent in all investigated specimens along the course of the
nerval roots towards the spinal cord. In another cadaveric study by Orebauch et al., cranial
epidural spread was also detectable following injection of dye into the nerval roots of the
brachial plexus.(13) Magnetic resonance imaging has not yet been used for visualization of
the spread of local anaesthetics in ISB.
Given that ultrasound provides excellent visualization of target-structures in regional
anesthesia and therefore enables physicians to place injection needles with enormous
accuracy, the question arises whether there is a critical volume for local anesthetics
increasing complications such as epidural spread and in consequence contralateral blockade.
The aim of this study is to confirm the findings of our cadaveric study in vivo and to show
that the frequency of epidural spread correlates with injection of increased volumes of
local anesthetics.
Primary endpoint: Spread of local anesthetics to the epidural space
Secondary endpoints:
- Contralateral epidural spread.
- Spread of local anesthetics to the phrenic nerve.
- Bed side spirometry and ultrasound investigation of the diaphragm in the PACU.
- Oxygen saturation in the PACU
- Self-reported block duration.
- Self reported pain scores for the first 24 postoperative hours
- Time to first analgesic consumption on demand.
- Total analgesic consumption (ropivacaine PCA).
Eligibility
Minimum age: 18 Years.
Maximum age: 75 Years.
Gender(s): Both.
Criteria:
Inclusion Criteria:
- Age between 18 and 75 years
- Surgery of the shoulder (shoulder arthroscopy, open shoulder joint surgery, rotator
cuff surgery, tendon transfer, shoulder arthroplasty, humerus fracture surgery)
- Patients willing to undergo magnetic resonance imaging prior to surgery
- Informed consent to participate in the study
- American Society of Anesthesiologists physical score I, II or III
Exclusion Criteria:
- Refusal to participate in the study
- Inability to understand the study protocol due to language barrier
- Serious cardiac or pulmonary disease such as decompensated heart failure, recent
myocardial infarction (less than one month in the past), heart block greater than 2nd
degree, obstructive sleep apnea and chronic obstructive lung disease greater than 2nd
degree
- renal impairment with an calculated glomerular filtration rate below 60ml/min
- Hypersensitivity to ropivacaine or gadolinium or other contraindications against
peripheral nerve blocks
- Chronic opioid usage greater than 15 mg oral morphine equivalents daily, the daily
use of adjunctive pain medications (gabapentins, tricyclic antidepressants,
serotonin-norepinephrine reuptake inhibitors)
- Schizophrenia or bipolar disorders, uncontrolled anxiety, claustrophobia
- Peripheral neuropathy
- Hepatic or renal impairment
- Ongoing illicit drug or alcohol abuse
- Metal implants or other contraindications for magnetic resonance imaging
- Coagulopathy
- Participation in additional clinical trials within 4 weeks before screening
- Hearing impairment
- Pregnancy
Locations and Contacts
Paracelsus Medical University, Department of Anesthesiology, Salzburg 5020, Austria
Additional Information
Related publications: Fredrickson MJ, Ball CM, Dalgleish AJ. A prospective randomized comparison of ultrasound guidance versus neurostimulation for interscalene catheter placement. Reg Anesth Pain Med. 2009 Nov-Dec;34(6):590-4. Fredrickson MJ, Ball CM, Dalgleish AJ, Stewart AW, Short TG. A prospective randomized comparison of ultrasound and neurostimulation as needle end points for interscalene catheter placement. Anesth Analg. 2009 May;108(5):1695-700. doi: 10.1213/ane.0b013e31819c29b8. Gautier P, Vandepitte C, Ramquet C, DeCoopman M, Xu D, Hadzic A. The minimum effective anesthetic volume of 0.75% ropivacaine in ultrasound-guided interscalene brachial plexus block. Anesth Analg. 2011 Oct;113(4):951-5. doi: 10.1213/ANE.0b013e31822b876f. Epub 2011 Aug 4. Vandepitte C, Gautier P, Xu D, Salviz EA, Hadzic A. Effective volume of ropivacaine 0.75% through a catheter required for interscalene brachial plexus blockade. Anesthesiology. 2013 Apr;118(4):863-7. doi: 10.1097/ALN.0b013e3182850dc7. Cobcroft MD. Letter: Bilateral spread of analgesia with interscalene brachial plexus block. Anaesth Intensive Care. 1976 Feb;4(1):73. Dooley J, Fingerman M, Melton S, Klein SM. Contralateral local anesthetic spread from an outpatient interscalene catheter. Can J Anaesth. 2010 Oct;57(10):936-9. doi: 10.1007/s12630-010-9360-y. Epub 2010 Jul 23. Fredrickson MJ, Kilfoyle DH. Neurological complication analysis of 1000 ultrasound guided peripheral nerve blocks for elective orthopaedic surgery: a prospective study. Anaesthesia. 2009 Aug;64(8):836-44. doi: 10.1111/j.1365-2044.2009.05938.x. Gologorsky E, Leanza RF. Contralateral anesthesia following interscalene block. Anesth Analg. 1992 Aug;75(2):311-2. Gomez RS, Mendes TC. Epidural anaesthesia as a complication of attempted brachial plexus blockade using the posterior approach. Anaesthesia. 2006 Jun;61(6):591-2. Kumar A, Battit GE, Froese AB, Long MC. Bilateral cervical and thoracic epidural blockade complicating interscalene brachial plexus block: report of two cases. Anesthesiology. 1971 Dec;35(6):650-2. Lombard TP, Couper JL. Bilateral spread of analgesia following interscalene brachial plexus block. Anesthesiology. 1983 May;58(5):472-3. Fritsch G, Hudelmaier M, Danninger T, Brummett C, Bock M, McCoy M. Bilateral loss of neural function after interscalene plexus blockade may be caused by epidural spread of local anesthetics: a cadaveric study. Reg Anesth Pain Med. 2013 Jan-Feb;38(1):64-8. doi: 10.1097/AAP.0b013e318277a870. Orebaugh SL, McFadden K, Skorupan H, Bigeleisen PE. Subepineurial injection in ultrasound-guided interscalene needle tip placement. Reg Anesth Pain Med. 2010 Sep-Oct;35(5):450-4. doi: 10.1097/AAP.0b013e3181e859f0.
Starting date: December 2013
Last updated: July 9, 2014
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