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Letters to the editor
Possible association of a reduction in cardiovascular events with blood donation
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Sir,—As Meyers et al note, data regarding the iron hypothesis of atherogenesis are inconsistent,1 and data regarding the closely allied oxidation hypothesis are also conflicting.2 Thus, I suggest that the beneficial effect of blood donation on cardiovascular disease is caused by a reduction in haematocrit and blood viscosity. Haematocrit was shown to be a risk factor for atherosclerosis in the Framingham study.3 Haematocrit is also a very …