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
Mechanisms of lumen gain in balloon dilatation (PTCA): Fracture of plaque, Axial redistribution of plaque, Arterial wall stretching – can rebound later.
