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Studies in isolated tissues and myocytes show different repolarisation properties in subepicardium, midmyocardium and subendocardium. Whether these differences are present in vivo and are relevant to humans has been the subject of controversy. Our objectives were (1) to ascertain whether transmural repolarisation gradients are present in humans, (2) to determine whether the greater sensitivity of subepicardial cells to ischaemia in vitro is manifest during early ischaemia in humans in vivo.

Transmural repolarisation in the left ventricle in humans during normoxia and ischaemia