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

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What feature is examined when analyzing the P wave on an ECG?

Heart rate

QRS configuration

Size and shape

The size and shape of the P wave is a crucial feature examined when analyzing an ECG. The P wave represents atrial depolarization, and its morphology provides essential information about the atrial activity. A normal P wave is typically smooth, rounded, and upright in lead II, reflecting the electrical conduction as it spreads through the atria.

Anomalies in the P wave, such as changes in its size, shape, or duration, can indicate various atrial issues, including enlargement (e.g., left atrial enlargement may produce a broader P wave) or abnormal conduction pathways (e.g., atrial fibrillation may result in absent or significantly altered P waves). Therefore, analyzing the size and shape of the P wave helps establish the electrical and structural integrity of the atrial chambers, contributing significantly to diagnosing heart conditions.

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Measurement of intervals

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