An electrocardiograph records the electrical activity of the heart from the surface of the body and the recording is known as an electrocardiogram (ECG).
When natural pacemaker of the heart stops functioning properly, heart rate may fall to dangerously low levels, requiring an artificial cardiac pacemaker.
Phases of ventricular fibrillation (VF)
Here is what has been called as the three phase model of ventricular fibrillation:
Electrical phase: Initial 4 minutes of VF.
Hemodynamic phase: 4 minutes to
