ECG: the first step

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QRS wave

"The cardiac vector loop during ventricular depolarization" is projected to a lead and forms a QRS wave.

During one heart beat , "cardiac vector loop during atrial depolarization", "cardiac vector loop during ventricular depolarization", and "cardiac vector loop during ventricular repolarization" appear and disappear in succession. Each loop is projected and forms a waveform (the P, QRS, and T wave), respectively. Among the three, the "cardiac vector loop during ventricular depolarization" most closely reflects the characteristic of the ventricular activity. It is directed to the area with increased electrical activity of the ventricle, namely the area the ventricle is relatively thick, and when projected to a lead, forms the QRS wave.

Achievement Quiz

  1. The cardiac vector during ventricular reflects the characteristic of the ventricular activity the most.
  2. QRS wave is the wave formed by the cardiac vector loop during .
  3. The "cardiac vector loop during ventricular depolarization" is projected to a lead, and forms a .
  4. The "cardiac vector loop during ventricular depolarization" spreads to the area the ventricle is relatively .