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Monopolar vs. Bipolar EMG Readings. Electromyograhic or EMG signal is the muscle electrical activity. It is the superposition of the evoked action potentials of all the active motor units in a muscle. It can be recorded either in Monopolar or Bipolar configuration.
Electrical axis and recording lead vectors (see Figures 2 and 3) The ECG is measured by placing a series of electrodes on the patientâs skin â so it is known as the âsurfaceâ ECG. The wave of electrical depolarisation spreads from the atria down though the IVS to the ventricles. So the direction of this depolarisation is usually from the superior to the inferior aspect of the heart.