Prediction of Pain After Breast Cancer Surgery With EEG

Study Overview
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Brief Summary
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Rationale The inter-individual pain experience immediately after surgery is considerable. In addition, a number of patients develop chronic post surgery pain (CPSP). Patients undergoing surgery for breast cancer are at risk of developing both acute post surgical pain as well as CPSP. Recently, in a group of patients with chronic back pain, it was demonstrated how subjectively reported pain is associated with specific electroencephalography (EEG) parameters, namely the N2 and P3 components of the pain event-related potential (ERP). It was concluded that ERP was associated with self-reported pain in daily life up to two weeks after the measurement. This resulted in the current hypothesis that EEG may be a predictor for postoperative pain. Study design Prospective cohort study. Within 2 weeks before surgery, 150 patients will undergo an EEG measurement with five 'vulnerability' tasks. The experiment will be repeated 6 months postoperatively. Study population: Female patients with breast cancer who will undergo breast surgery, between the ages of 18 to 65 years. Main study parameters/endpoints Primary outcome is postoperative pain, measured in a pain diary 4 days postoperatively. Secondary outcomes are development of chronic post surgery pain and quality of life. The main goal is to develop a comprehensive prediction model for acute and chronic postoperative pain after breast cancer surgery, based on the EEG results of the five vulnerability experiments.

Official Title
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EEG as a Predictor for Postoperative Pain and the Development of Chronic Postsurgical Pain After Breast Cancer Surgery

Conditions
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Breast Cancer, Postoperative Pain, Chronic Pain

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age 18 - 65 years. ASA 1-2. Sufficient comprehension of the Dutch spoken and written language. Elective curative breast cancer surgery, both mastectomy and breast- conserving therapy Stage I and II breast cancer. Written informed consent is obtained Exclusion Criteria: Previous breast surgery, both ipsilateral and contralateral. Stage III-IV breast cancer. Chronic pain (>3months) with an average severity of at least a VAS score 4 during the last two weeks. Chronic pain for which invasive treatment is needed. Use of (weak / strong) opioids in the last week. A history of opioid addiction. Regular use of the following medications in the last year: antiepileptics,antipsychotics and anxiolytics. ASA 3 or higher. Consumption of alcohol (>4 units) and / or drugs the evening before. Alcohol consumption (>= 5 units/day). Illiteracy, problems with self expression, language barrier. Serious vision and / or hearing problems, interfering the performance of the experimental tasks. A history of psychiatric complaints and/or epilepsy . A medical history of CVA or TIA.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Acute postoperative pain | VAS measured in a daily pain diary | during 4 days after surgery | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Quality of Life | Quality of Life measured with SF-36 | within 2 weeks before surgery and at 3,6 and 12 months postoperatively | 
| Development of chronic pain | Brief Pain Inventory | at 3,6 and 12 months postoperatively | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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EEG, breast cancer surgery, prediction, acute postoperative pain, chronic pain