Certified Cardiographic Technician (CCT) Practice Exam 2026 – Your All-in-One Guide to Exam Success!

Question: 1 / 400

Which heart rhythm is characterized by chaotic and irregular activity on an ECG?

Sinus tachycardia

Ventricular fibrillation

Ventricular fibrillation is characterized by chaotic and irregular electrical activity in the heart, leading to ineffective quivering of the ventricles. This results in a severe reduction in cardiac output, making it a life-threatening condition. On an electrocardiogram (ECG), ventricular fibrillation appears as an erratic, undulating waveform with no identifiable QRS complexes, P waves, or T waves, reflecting the disorganized nature of the electrical impulses in the ventricles.

In contrast, conditions like sinus tachycardia present as a uniformly elevated heart rate with distinct and regular P waves and QRS complexes, and atrial flutter shows a more organized pattern with "sawtooth" waves, while first-degree AV block features delayed conduction but maintains a regular rhythm throughout. Therefore, the distinguishing characteristic of ventricular fibrillation is its total lack of organized rhythm, making it the correct choice for this question.

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Atrial flutter

First-degree AV block

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