A 30-year-old female patient's electrocardiogram (ECG) shows two $P$ waves preceding each QRS complex. The interpretation of this pattern is

Question

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[III E 1 b]. A pattern of two $\mathrm{P}$ waves preceding each QRS complex indicates that only every other $\mathrm{P}$ wave is conducted through the atrioventricular (AV) node to the ventricle. Thus, conduction velocity through the AV node must be decreased.

A 30-Year-Old Female Patient's Electrocardiogram (ECG) Shows Two PPP Waves Preceding Each QRS Complex

A 30-Year-Old Female Patient's Electrocardiogram (ECG) Shows Two $P$ Waves Preceding Each QRS Complex