What cardiac rhythm disorder is known as rapid heartbeats that originate from the ventricles?

Ventricular tachycardia is characterized by rapid heartbeats that originate from the ventricles, specifically the lower chambers of the heart. In this condition, the heart beats faster than normal and often exceeds 100 beats per minute. This rhythm disturbance can significantly impair the effective pumping of blood, as the ventricles do not have enough time to fill with blood between contractions, which may lead to a drop in cardiac output and may manifest as symptoms like dizziness, palpitations, or even loss of consciousness.

Atrial fibrillation, while also a tachyarrhythmia, originates in the atria, the upper chambers of the heart, and is not classified under ventricular rhythms. Bradycardia refers to a slower heart rate, which is the opposite of what is being asked for in the question. Normal sinus rhythm indicates a regular heart rate that is healthy and within normal limits, which contrasts with the rapid and potentially harmful rhythm seen in ventricular tachycardia.