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- W2080321707 abstract "Our recent clinical studies suggest that the U wave represents Purkinje repolarization. To test this hypothesis, transmembrane potentials of Purkinje fibers (P) and the ventricular muscle (V) were simultaneously recorded from canine P-V preparations perfused in a tissue bath, and effects of various factors causing prominent U waves were studied. These include low stimulating frequency (bracycardia), low potassium (K) concentration, hypothermia, and quinidine. Bracycardia increased the difference between action potential duration of P and V, and decreased the rate of repolarization in P. Similarly, the difference of P and V action potential duration was increased markedly by low K and hypothermia, and slightly by quinidine, while the slope of phase 3 was significantly decreased by all these factors. In several intact animals either hypokalemia or hypothermia was produced using hemodialysis or extracorporeal circulation, and recorded electrocardiograms were compared with the P and V action potentials obtained under similar perfusing conditions in subsequent tissue bath study. Such comparison revealed a good temporal correlation between phase 3 repolarization in P and the electrocardiographic U wave. These results, although indirect, appear to support the theory that P repolarization caused the genesis of the U wave." @default.
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- W2080321707 date "1975-06-01" @default.
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- W2080321707 title "Purkinje repolarization as a possible cause of the U wave in the electrocardiogram." @default.
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- W2080321707 doi "https://doi.org/10.1161/01.cir.51.6.1030" @default.
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