<unk>  <unk>  is a rapid heartbeat that starts in the ventricles.  In some cases it may impair the ability of the heart to pump and the blood pressure may drop.  This is referred to as a cardiac arrest or a code in lay terms.
Ventricular tachycardia
Sinus arrhythmia
Wide complex tachycardia
Narrow complex tachycardia
Supraventricular arrhythmias
Junctional tachycardia
Torsades de pointes
Supraventricular tachycardia