Omega 3 Polyunsaturated Fatty Acid Supplements (PUFAs) and Microvolt T Wave Alternans (TWA) in Patients With Ventricular Arrhythmia

Study Overview
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Brief Summary
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This is a hypothesis testing study, the hypothesis being that dietary supplements of n-PUFAs concentrates are anti-arrhythmic in ventricular arrhythmic substrates. Study Aims: To investigate whether dietary supplements of n-3 polyunsaturated fatty acid concentrates (2g PUFAs/day, Omacor) reduces MTWA (a surrogate endpoint for ventricular arrhythmia substrate) in patients with ICDs for malignant ventricular arrhythmias.

Detailed Description
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Patients from the Department of Cardiology ICD out-patient clinic, Ninewells Hospital and Medical School, will be recruited. All these patients have a history of documented ventricular arrhythmia. Data from previous studies predict that 90% of these patients will have abnormal MTWA. A total of 45 ICD patients will be recruited. The study design will be a double blind randomised placebo controlled crossover design. A baseline MTWA test will be performed and patients with an abnormal test will be selected. The patients will be randomised to receive fish oil supplements (2g/day) or placebo for 8 weeks each. At the end of each intervention period, a repeat MWTA test will be performed. A 10 ml venous blood sampled will also be collected at baseline, and after each intervention period (3 samples in total). Patients in atrial fibrillation, frequent atrial or ventricular ectopics, or with ventricular pacing from the ICD, unstable angina, NYHA IV heart failure, pregnancy or child bearing potential will be excluded from the study. End Points of the Study. The primary endpoint will be quantitative and qualitative measures of MTWA during n-3 PUFAs treatment compared to placebo. Statistical Analysis: Quantitative differences in MTWA measurements will be analysed by a Student's t-test and qualitative differences by a chi squared test. A probability of 0.05% will be considered significant.

Official Title
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The Effect of Omega-3 Polyunsaturated Fatty Acid Supplements on Microvolt T Wave Alternans in Patients With Ventricular Arrhythmia

Conditions
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Arrhythmia, Defibrillators, Implantable

Intervention / Treatment
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* Dietary Supplement: n-3 polyunsaturated fatty acids (PUFAs)
* Dietary Supplement: olive oil


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: implantable cardiovertor defibrillators microvolt Twave alternans positive Exclusion Criteria: unstable angina CHF

Ages Eligible for Study
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Minimum Age: 21 Years
Maximum Age: 80 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: Crossover Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: A1<br>n-3 PUFAs | Dietary Supplement: n-3 polyunsaturated fatty acids (PUFAs)<br>* 2g n-3 PUFAs once daily for 8 weeks<br>* Other names: Omacor;|
| Placebo Comparator: A2<br>olive oil capsules | Dietary Supplement: olive oil<br>* 1 capsule day<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in microvolt T wave alternans status |  | 8 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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fish oils