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P wave abnormalities with myocardial infarction: an aid to the diagnosis of left ventricular failure
  1. T. A. Hassell,
  2. B. I. Hoffbrand

    Abstract

    An investigation during a prospective study of myocardial infarction has confirmed previous observations of P wave changes in association with left ventricular failure. Although an indicator of pre-existing left ventricular disease as well as acute left atrial distension, a negative deflection of 1 mm or more in the P wave of lead V1 should raise strong suspicions about the presence of this serious complication.

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