Cardiac Electrophysiology

A. Electrocardiogram (ECG) [Figure 3-3]

- represents atrial depolarization.

- does not include atrial repolarization, which is "buried" in the QRS complex.

2. PR interval

- is the interval from the beginning of the P wave to the beginning of the Q wave (initial depolarization of the ventricle).

-varies with conduction velocity through the atrioventricular (AV) node. For example, if AV nodal conduction decreases (as in heart block), the PR interval increases.

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