Optimal Location of Local Anesthetic Injection for Ultrasound Guided Interscalene Block

University of California San Francisco (UCSF)

Status: Completed

Conditions: Shoulder Arthroscopy; Ultrasound-guided Interscalene Nerve Block

Treatments: Procedure: Interscalene block for shoulder arthroscopy

Study type: Interventional

Funder types: Other

Identifiers

NCT01877330

ISNB001

Details and patient eligibility

About

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.

Enrollment: 208 patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

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.

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

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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208 participants in 2 patient groups

Injection in interscalene groove

Active Comparator group

Description:

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.

Treatment:

Procedure: Interscalene block for shoulder arthroscopy

Injection between nerve roots

Active Comparator group

Description:

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.

Treatment:

Procedure: Interscalene block for shoulder arthroscopy