• Chaotic electrical activity occurs with no ventricular depolarization or contraction.
• The amplitude and frequency of the fibrillatory activity can be used to define the type of fibrillation as coarse, medium, or fine. Small baseline undulations are considered fine; large ones are coarse.

Rate: Indeterminate

Rhythm: Chaotic

P Waves: None

PR Interval: None

QRS: None

Clinical Tip: There is no pulse or cardiac output. Rapid intervention is critical. The longer the delay, the less the chance for conversion.