ECG Finding for Right Atrial Hypertrophy

The question asks to identify the ECG characteristic that suggests right atrial hypertrophy (RAH).

Analyzing ECG Indicators of Atrial Enlargement

Right atrial hypertrophy leads to increased electrical activity and duration in the right atrium. This is typically reflected on an electrocardiogram (ECG) as specific changes in the P wave morphology.

• Right Atrial Hypertrophy (RAH): Characteristically causes a tall, peaked P wave, often exceeding 2.5 mm in height, particularly in leads like II, III, and aVF. This specific morphology is often termed "P pulmonale".
• Left Atrial Hypertrophy (LAH): Usually associated with a widened and often notched P wave (sometimes biphasic), known as "P mitrale".
• P-R Interval: This represents the time from the beginning of atrial depolarization to the beginning of ventricular depolarization. Prolongation suggests a delay in AV nodal conduction (e.g., AV block), not primarily atrial hypertrophy.
• P-Q Segment: This segment relates to the conduction through the AV node and is not a primary indicator of atrial size.

Identifying the Correct ECG Sign

Based on standard ECG criteria:

• A tall, spiky P wave is the classic sign suggestive of right atrial hypertrophy (P pulmonale).
• A widened P wave indicates left atrial enlargement.
• Prolonged P-R interval indicates conduction system issues.

Therefore, the presence of a tall spiky P wave on an ECG tracing suggests right atrial hypertrophy.

Correct Option: Tall spiky P wave