Dietary Flaxseed Protects against Ventricular Fibrillation Induced by Ischemia-Reperfusion in Normal and Hypercholesterolemic Rabbits

January 1, 2004 Human Health and Nutrition Data 0 Comments

Dietary Flaxseed Protects against Ventricular Fibrillation Induced by Ischemia-Reperfusion in Normal and Hypercholesterolemic Rabbits

Year: 2004
Authors: Ander, B.P., Weber, A.R., Rampersad, P.P., Gilchrist, J.S.C., Pierce, G.N., Lukas, A.
Publication Name: J. Nutr.
Publication Details: Volume 134, Pages 3250-3256.

Abstract:

Eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), the (n-3) PUFA found in fish oils,
exert antiarrhythmic effects during ischemia. Flaxseed is the richest plant source of another (n-3) PUFA,  a-linolenic acid (ALA), yet its effects remain largely unknown. Our objective was to determine whether a flaxseed-rich diet is antiarrhythmic in normal and hypercholesterolemic rabbits. Male New Zealand White (NZW) rabbits (n = 14–16) were fed as follows: regular diet (REG group); diet containing 10% flaxseed (FLX group); 0.5% cholesterol (CHL group); or 0.5% cholesterol + 10% flaxseed (CHL/FLX group) for up to 16 wk. Plasma cholesterol was significantly elevated in the CHL and CHL/FLX groups. Plasma triglycerides were unchanged. ALA levels increased significantly in plasma and hearts of the FLX and CHL/FLX groups. After the feeding period, rabbit hearts were isolated and subjected to global ischemia (30 min) and reperfusion (45 min). Ventricular fibrillation (VF) occurred during ischemia in 33% of REG but in none of FLX hearts, and 28% of CHL but only 6% of CHL/FLX hearts. VF incidence during
reperfusion was 28% and 26% in REG and FLX hearts, respectively. The incidence significantly  increased to 64% in CHL hearts, and was significantly attenuated (18%) in CHL/FLX hearts. CHL markedly prolonged the QT interval, whereas FLX significantly shortened the QT interval and reduced arrhythmias in the FLX and CHL/FLX hearts. In vitro application of (n-3) PUFA shortened the action potential duration, an effect consistent with the QT data. This study demonstrates that dietary flaxseed exerts antiarrhythmic effects during ischemia-reperfusion in rabbit hearts, possibly through shortening of the action potential. Author's Abstract.



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