Optimal Location of Local Anesthetic Injection for Ultrasound Guided Interscalene Block

Not Applicable

Completed

• Conditions: Ultrasound-guided Interscalene Nerve Block; Shoulder Arthroscopy
• Interventions: Procedure: Interscalene block for shoulder arthroscopy

• Registration Number: NCT01877330
• Lead Sponsor: University of California, San Francisco

Brief Summary

This is a prospective randomized clinical trial to determine where is the optimal location for local anesthetic injection for ultrasound guided interscalene nerve blocks. The investigators are investigating if local anesthetic deposited between the nerve roots is more effective than local anesthetic deposited in the interscalene groove.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2012-12-12
• Study Start: 2013-01
• Study First Submitted QC: 2013-06-12
• Study First Posted: 2013-06-13
• Primary Completion: 2016-03
• Study Completion: 2016-04
• Status Verified: 2020-03
• Last Update Submitted: 2020-03-17
• Last Update Posted: 2020-03-19

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 208

Inclusion Criteria

ASA I-II patients who are 18 years and older and who are scheduled for shoulder arthroscopy are eligible for enrollment provided they do not have any of the following exclusion criteria.

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Exclusion Criteria

• chronic pain
• high preoperative opioid requirement
• age < 18 years old
• non-English speaking
• contraindication to regional anesthesia (allergy to local anesthetics, coagulopathy, severe thrombocytopenia, pre-existing neuropathy in operative limb, infection at puncture site)
• need for postoperative nerve function monitoring
• patient refusal
• dementia
• pulmonary disease or low baseline oxygen saturation

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Injection between nerve roots	Interscalene block for shoulder arthroscopy	Patients undergoing shoulder arthroscopy will have an interscalene nerve block by injection of ropivacaine in the interscalene groove inbetween the C5 and C6 nerve roots.
Injection in interscalene groove	Interscalene block for shoulder arthroscopy	Patients undergoing shoulder arthroscopy will have an interscalene nerve block by injection of ropivacaine in the interscalene groove anterior and posterior to the brachial plexus nerves.

Primary Outcome Measures

Name	Time	Method
Onset of motor blockade	1 hour from time of injection	Time to loss of shoulder abduction.

Secondary Outcome Measures

Name	Time	Method
Number of needle passes	1 hour
Patient Satisfaction Score	24 hours
Opioid consumption	24 hours	Opioid consumption - perioperative and post discharge
Duration of nerve block	24 hours	Duration of analgesia from nerve block
Quality of Nerve block	24 hours	onset of sensory block
Incidence of post-operative nausea/vomiting	24 hours
Number of paresthesias	1 hour	number of paresthesia experience during nerve block
Residual paresthesia	24 hour	incidence of residual paresthesias

Trial Locations

Locations (1)

UCSF Orthopedic Institute; 🇺🇸 San Francisco, California, United States