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- W2102575019 abstract "The ECG and VCG effects of various degrees of right and left atrial enlargement have been studied. The method employed consisted of derivation of P loops and P waves from casts of the interior of the atria of four normal hearts. Photographic enlargements of the models were employed to obtain the various degrees of atrial enlargement studied. The major VCG effect of right atrial enlargement was increased length of vectors without marked changes in orientation. In the ECG these vectors of increased magnitude were reflected by increased amplitude of P waves in Lead II. Two atrial models yielded notched P waves in Lead I or Leads I and II with some of the degrees of right atrial enlargement studied. Left atrial enlargement resulted in less increase in magnitude of vectors but there was a progressive shift in orientation of vectors toward the left. The P loops enclosed progressively greater areas with increasing left atrial enlargement. The P waves became flat topped or notched with left atrial enlargement, but in some instances notching of the waves occurred only with certain degrees of enlargement. With comparable degrees of enlargement there were greater increases in duration of atrial activation with right than with left atrial enlargement. Neither the increases in duration of activation, length of frontal plane vectors, or amplitude of P waves were linear with the degrees of enlargement studied." @default.
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- W2102575019 date "1957-01-01" @default.
- W2102575019 modified "2023-10-17" @default.
- W2102575019 title "A quantitative study of the electrocardiographic effects of atrial enlargement" @default.
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- W2102575019 doi "https://doi.org/10.1016/0002-8703(57)90383-6" @default.
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