The significance of an absent or a small initial positive deflection in the precordial lead

  • A.M. Master, S. Dack, H.H. Kalter, H.L. Jaffe
  • American Heart Journal, September 1937, Elsevier
  • DOI: 10.1016/s0002-8703(37)90566-0

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http://dx.doi.org/10.1016/s0002-8703(37)90566-0