ECG: the first step

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"cardiac vector"

Let's assume there is a "cardiac vector". The cardiac vector is directed to the area with increased electrical activity of the heart, namely the area the heart muscle is relatively thick.

As will be discussed further later, within one cardiac cycle, the "cardiac vector" appears and disappears 3 times, namely during atrial depolarization, during ventricular depolarization, and during ventricular repolarization. Each time the direction, size and duration differs. For now, let's concentrate on the cardiac vector during ventricular depolarization. The cardiac vector is basically directed to the area the heart muscle is relatively thick. Since the area the ventricle is relatively thick in a normal subject is located left-inferior posteriorly, the "cardiac vector during ventricular depolarization" is basically directed left-inferior posteriorly.

Achievement Quiz

  1. is thicker than the other.
  2. Left ventricle is of the right ventricle.
  3. Left ventricle is the right ventricle.
  4. Because of the in the upper area of the ventricle, the electrical activity is .
  5. Because of the in the lower area of the ventricle, the electrical activity is .
  6. The "area the ventricle is relatively thick" in normal subjects is located , , .
  7. The "cardiac vector during ventricular depolarization" is (basically) directed to the area the ventricle is relatively .
  8. The "cardiac vector during ventricular depolarization" in normal subjects is (basically) directed to the , , .
  9. The "cardiac vector during ventricular depolarization" is spacially -dimensional.