Certified Cardiographic Technician (CCT) Practice Exam 2025 - Free CCT Practice Questions and Study Guide

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Which of the following conditions may lead to a widened QRS complex?

Heart block

The condition that may lead to a widened QRS complex is heart block. In heart block, there is a delay or complete interruption in the electrical conduction through the bundle branches which can result in a prolonged QRS duration. This indicates that the ventricles are depolarizing more slowly than normal, which manifests as a widened QRS complex on an electrocardiogram (ECG).

The other options presented, such as atrial tachycardia and atrial fibrillation, typically do not cause widening of the QRS complex because these arrhythmias primarily affect the atria and do not involve the same conduction pathways that would elongate the QRS duration. A normal variant also would not usually lead to changes in the QRS complex width as it typically indicates a benign finding on an ECG. Understanding the underlying physiology of heart block is crucial for recognizing its impact on the QRS complex duration.

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Atrial tachycardia

Atrial fibrillation

Normal variant

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