Amp Up Your Skills with the Certified EKG Technician (CET) Practice Exam 2026 – Pulse Your Way to Success!

A wide QRS complex on an EKG often indicates that there is a delay in the conduction of electrical impulses through the ventricles, which can suggest the presence of a bundle branch block or another type of conduction disturbance. This delay in ventricular depolarization results in a wider appearance of the QRS complex.

When the QRS duration exceeds 0.12 seconds (three small squares on the EKG), it typically reflects issues such as a potential heart block, particularly in the bundle branches of the conduction system. This can be a sign that the heart is not conducting electrical signals efficiently, potentially leading to rhythm disturbances or impaired cardiac function.

In contrast, a normal heart function usually presents a narrow QRS complex, indicating that the electrical impulses are being conducted promptly through the ventricles. Healthy ventricular activity would also display a normal QRS width under typical physiological conditions. An increased heart rate may affect the heart rhythms but would not specifically relate to the width of the QRS complex. Thus, the interpretation that a wide QRS complex suggests potential heart block is particularly relevant in clinical practice and EKG analysis.