Certified Rhythm Analysis Technician (CRAT) Practice Exam 2025 – All-in-One Study Guide for Exam Success!

Question: 1 / 400

When should a bundle branch block be considered in terms of QRS complex duration?

0.06 to 0.10 seconds

0.04 to 0.08 seconds

Less than 0.06 seconds

0.12 seconds or greater

A bundle branch block should be considered when the QRS complex duration is 0.12 seconds or greater. This threshold is significant because a QRS duration of 0.12 seconds indicates a delay in the conduction through one of the bundle branches (either the right or left), leading to a broader QRS complex on the electrocardiogram (ECG).

In a normal conduction pathway, the electrical impulse travels quickly through the ventricles, resulting in a narrow QRS complex, usually less than 0.12 seconds. When there is a block in one of the bundle branches, the impulses take longer to travel through the ventricles, causing the duration of the QRS complex to increase. Therefore, recognizing this QRS duration is critical for diagnosing bundle branch blocks, which can have significant clinical implications, including the assessment of underlying heart disease or conduction abnormalities.

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