Tall peaked P waves on an electrocardiogram are most strongly associated with enlargement of which chamber?

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Multiple Choice

Tall peaked P waves on an electrocardiogram are most strongly associated with enlargement of which chamber?

Tall, peaked P waves, often called P pulmonale, point to enlargement of the right atrium. When the right atrium enlarges due to conditions that raise right-sided pressures—most classically pulmonary hypertension from chronic lung disease or tricuspid regurgitation—the atrial depolarization vector toward the inferior leads becomes stronger, so the P waves in those leads become tall and sharp. In contrast, left atrial enlargement tends to produce broad, notched P waves (P mitrale) with a longer duration and prominent terminal forces in V1, while left ventricular or right ventricular hypertrophy affect QRS patterns and axis rather than producing tall P waves. So the presence of tall, peaked P waves most specifically indicates right atrial enlargement.

Tall, peaked P waves, often called P pulmonale, point to enlargement of the right atrium. When the right atrium enlarges due to conditions that raise right-sided pressures—most classically pulmonary hypertension from chronic lung disease or tricuspid regurgitation—the atrial depolarization vector toward the inferior leads becomes stronger, so the P waves in those leads become tall and sharp. In contrast, left atrial enlargement tends to produce broad, notched P waves (P mitrale) with a longer duration and prominent terminal forces in V1, while left ventricular or right ventricular hypertrophy affect QRS patterns and axis rather than producing tall P waves. So the presence of tall, peaked P waves most specifically indicates right atrial enlargement.

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