Perineural Catheter Insertion Distance for Continuous Peripheral Nerve Blocks

Study Overview
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Brief Summary
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This is a research study to determine if the effects of continuous peripheral nerve blocks are influenced by the distance of insertion past the needle tip of the perineural catheter.

Detailed Description
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Specific Aim: Research study to determine the relationships between perineural catheter insertion distance and subsequent continuous peripheral nerve block effects. Hypothesis: during ultrasound-guided perineural catheter placement, inserting the catheter 0-1cm past the needle tip is associated with decreased postoperative pain compared with inserting the catheter 5-6cm past the needle tip.

Official Title
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Perineural Catheter Insertion Distance for Continuous Peripheral Nerve Blocks

Conditions
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Lower Extremity Surgery, Upper Extremity Surgery, Post-operative Pain

Intervention / Treatment
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* Procedure: Sciatic catheter left 0-1cm past needle tip vs. 5-6cm past needle tip


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: undergoing surgery with a planned popliteal perineural catheter for postoperative analgesia age 18 years or older Exclusion Criteria: pregnancy inability to communicate with the investigators and hospital staff incarceration clinical neuropathy in the surgical extremity chronic high-dose opioid use history of opioid abuse

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Catheter 0-1cm past needle tip<br>Patients will be receiving a sciatic (popliteal), femoral, or interscalene nerve block and will be randomized to having the catheter placed 0-1cm past the needle tip. The patient will be called the following day by research staff to assess their post-surgical pain. | Procedure: Sciatic catheter left 0-1cm past needle tip vs. 5-6cm past needle tip<br>* Patients undergoing orthopedic surgery who are getting a perineural catheter will be randomized to one of two groups: catheter tip placed 0-1cm past needle tip or catheter tip placed 5-6cm past needle tip. Patients will be called by research staff the day following surgery to assess their post-surgical pain using a numeric rating scale.<br>|
| Active Comparator: Catheter placed 5-6cm past needle tip<br>Patients will be receiving a sciatic (popliteal), femoral, or interscalene nerve block and will be randomized to having the catheter placed 5-6cm past the needle tip. Patients will be called the following day by research staff to assess their post-surgical pain. | Procedure: Sciatic catheter left 0-1cm past needle tip vs. 5-6cm past needle tip<br>* Patients undergoing orthopedic surgery who are getting a perineural catheter will be randomized to one of two groups: catheter tip placed 0-1cm past needle tip or catheter tip placed 5-6cm past needle tip. Patients will be called by research staff the day following surgery to assess their post-surgical pain using a numeric rating scale.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Average pain in the three hours previous to a phone call the day following surgery as measured on a numeric rating scale (0-10, 0=no pain, 10=worst imaginable pain). |  | Day 1 after surgery, 3 hours prior to phone call | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Pain, Surgery, Catheter, Nerve Block, Popliteal, Sciatic, Femoral, Interscalene, UCSD, Moderate-to-severe pain, Perineural Catheter, Orthopedic Surgery