Prediction Of Post Operative Pain Following Arthroscopic Shoulder Surgery

Study Overview
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Brief Summary
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Following arthroscopic shoulder surgery a small but significant number of people suffer severe postoperative pain. This study aims to predict which patients are at risk of developing severe post operative pain so that they may be targeted with a more aggressive post operative pain regimen.

Detailed Description
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Patients presenting for elective (day case) arthroscopic shoulder surgery for either Arthroscopic Subacromial Decompression (ASD Group) or Rotator Cuff Repair (RCR Group) are recruited. Using a Cefar PainMatcher, a pain and sensory threshold assessment tool, consenting patients will have their preoperative pain thresholds recorded. The patients will then have a standard anaesthetic administered with TIVA (propofol/remifentanil) and either a subacromial injection (ASD Group) or interscalene block (RCR Group). Four days following surgery a telephone questionnaire will be completed by the patients recording their worst pain score since surgery.

Official Title
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PREDICTION OF POST OPERATIVE PAIN FOLLOWING ARTHROSCOPIC SHOULDER SURGERY

Conditions
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Arthroscopic Shoulder Surgery, Pain Threshold

Intervention / Treatment
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* Device: Electrical pain threshold measurement
* Device: Measurement of electrical pain threshold


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All patients aged 18 years or older able to give informed consent undergoing arthroscopic shoulder surgery at NHS Fife (ASD or rotator cuff repair) Exclusion Criteria: Unable to give informed consent Allergy to remifentanil, propofol or levobupivacaine. Absence of contralateral arm (thumb/fingers) Documented sensory abnormality (e.g. peripheral neuropathy) Those not consenting to subacromial injection or interscalene block intraopertively (part of routine management after surgery). Psychiatric disease (documented history in Hospital notes or GP referral summary) Drug or alcohol misuse (suspicion of or documented) No telephone or unable to communicate in English (no interpreter service available)

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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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Screening
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Electrical pain threshold measrement patients<br> | Device: Electrical pain threshold measurement<br>* Assessment of preoperative pain threshold using electrical stimulation using a Painmatcher machine.<br>* Other names: Pain Matcher ® (Cefar Medical AB, Lund, Sweden);Device: Measurement of electrical pain threshold<br>* Measurement of preoperative electrical pain threshold and self reporting of postoperative pain scores (for 4 days) on VAS.<br>* Other names: Pain Matcher ® (Cefar Medical AB, Lund, Sweden);|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Post operative pain level | Post operative pain level recorded on a VAS (0-10) at rest and movement for the first four days pots shoulder surgery. This information will be correlated with the preoperative pain threshold of patients taken with the Pain matcher machine. | 4 days | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Arthroscopic shoulder surgery, Pain threshold