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Electrophysiology Unit (EPU) Practice Exam

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Which term describes the measurement obtained directly from a catheter inside the heart?
Correct Answer:
Intracardiac EGMs
Explanation:
When a catheter is inside the heart, the signals it records are called intracardiac electrograms. These are measurements of the local electrical activity at the catheter tip, giving a precise view of when that specific heart tissue depolarizes. This direct, site-specific recording is essential for mapping arrhythmias and guiding ablation, because it reveals the exact timing and sequence of activation at different intracardiac sites. More general “heart electrical activity” is vague and can refer to surface ECG or other broad measures, while a HIS-EGM is a specific intracardiac signal near the His bundle rather than the general term. Respiratory rate is unrelated.

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