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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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Injection in interscalene groove | Active Comparator | 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. |
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| Injection between nerve roots | Active Comparator | 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. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Interscalene block for shoulder arthroscopy | Procedure |
|
| Measure | Description | Time Frame |
|---|---|---|
| Onset of motor blockade | Time to loss of shoulder abduction. | 1 hour from time of injection |
| Measure | Description | Time Frame |
|---|---|---|
| Patient Satisfaction Score | 24 hours | |
| Opioid consumption | Opioid consumption - perioperative and post discharge | 24 hours |
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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:
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| Name | Affiliation | Role |
|---|---|---|
| Pedram Aleshi, MD | University of California, San Francisco | Principal Investigator |
| Monica W Harbell, MD | University of California, San Francisco | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| UCSF Orthopedic Institute | San Francisco | California | 94158 | United States |
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| Quality of Nerve block |
onset of sensory block |
| 24 hours |
| Incidence of post-operative nausea/vomiting | 24 hours |
| Duration of nerve block | Duration of analgesia from nerve block | 24 hours |
| Number of needle passes | 1 hour |
| Number of paresthesias | number of paresthesia experience during nerve block | 1 hour |
| Residual paresthesia | incidence of residual paresthesias | 24 hour |