Which characteristic is observed in multifocal atrial tachycardia?

Which characteristic is observed in multifocal atrial tachycardia?

• A. P wave shape varied
• B. Atrial rate exceeds 100 bpm
• C. Irregular ventricular rhythm
• D. All of the above

Answer: (D)

In multifocal atrial tachycardia (MAT), several key characteristics are observed, which make the correct choice evident.

Firstly, the P wave shape varies significantly from one beat to another. This variation is due to the presence of multiple ectopic foci in the atria that generate impulses, leading to different configurations of the P waves on the electrocardiogram (EKG).

Secondly, the atrial rate in MAT typically exceeds 100 beats per minute, which is a defining feature of tachycardia. The rapid firing from various atrial foci contributes to this elevated rate.

Lastly, the ventricular rhythm tends to be irregular. This irregularity arises because each ectopic atrial impulse may conduct through the atrioventricular (AV) node at different intervals, resulting in an uneven spacing between the QRS complexes.

Given these characteristics — a varied P wave shape, an atrial rate exceeding 100 bpm, and an irregular ventricular rhythm — it stands to reason that the comprehensive nature of these observations affirms the broader classification of characteristics associated with multifocal atrial tachycardia, making the collective option clearly accurate.