How does atrial bigeminy typically appear on an EKG?

How does atrial bigeminy typically appear on an EKG?

• A. Altered T waves
• B. Every normal cycle is followed by a PAB
• C. Frequent P waves with no QRS complexes
• D. Ventricular ectopic beats

Answer: (B)

Atrial bigeminy is characterized by the pattern where each normal heartbeat is followed by a premature atrial beat (PAB). On an EKG, this manifests as alternating normal sinus beats and premature atrial contractions, leading to a clear and repetitive sequence. Typically, you would see a normal P wave followed by a QRS complex, and then the next heartbeat would feature a premature P wave with a corresponding QRS complex that might appear earlier than expected.

This distinction in rhythm is crucial as it helps in diagnosing the condition. The presence of a premature atrial beat immediately following every normal beat is the hallmark of atrial bigeminy and is what makes this answer correct. Understanding this rhythm helps in managing and recognizing the implications of atrial ectopic activity on overall cardiac function.