The Normal Electrocardiogram

  • Massimo Romanò


The electrocardiograph is a galvanometer calibrated to produce a deflection with an amplitude of 1 cm for every millivolt (mV) of voltage. The electrocardiogram (ECG) is recorded on graph paper divided into small 1-mm squares. At the standard paper speed of 25 mm/s, each small square corresponds to 40 ms (Fig. 3.1). Before the ECG is recorded, the machine must be calibrated to ensure that it is functioning correctly, and the square (or rectangular) calibration mark must be recorded on the tracing.


Frontal Plane Negative Deflection Precordial Lead Positive Deflection Early Repolarization 
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Copyright information

© Springer-Verlag Milan 2015

Authors and Affiliations

  • Massimo Romanò
    • 1
  1. 1.Ospedale Civile di VigevanoVigevanoItaly

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