Which rhythm is characterized by an irregular pulse and may include a pulse deficit?

Which rhythm is characterized by an irregular pulse and may include a pulse deficit?

• A. Atrial Tachycardia
• B. Atrial Flutter
• C. Atrial Fibrillation
• D. Premature Junctional Complex

Answer: (C)

In atrial fibrillation the rhythm is irregularly irregular because there are many chaotic atrial impulses firing at different rates and the AV node conducts these impulses to the ventricles in an unpredictable way. This creates an irregularly spaced ventricular rhythm and an irregular pulse. Often there are no identifiable P waves on ECG, only fibrillatory activity, and the pulse you feel can be unpredictable in strength, sometimes yielding a pulse deficit—the apical heart rate and the peripheral pulse don’t align because not every atrial impulse leads to a strong, palpable beat and the stroke volume can vary beat to beat. The other rhythms don’t fit this pattern. Atrial tachycardia tends to have a faster but regular rhythm with distinct P waves and a consistent AV conduction. Atrial flutter produces a sawtooth pattern with a more regular ventricular response unless variable block is present. Premature junctional complexes cause early, usually solitary beats that interrupt a regular rhythm but don’t create the ongoing irregularly irregular pulse characteristic of AF.

In atrial fibrillation the rhythm is irregularly irregular because there are many chaotic atrial impulses firing at different rates and the AV node conducts these impulses to the ventricles in an unpredictable way. This creates an irregularly spaced ventricular rhythm and an irregular pulse. Often there are no identifiable P waves on ECG, only fibrillatory activity, and the pulse you feel can be unpredictable in strength, sometimes yielding a pulse deficit—the apical heart rate and the peripheral pulse don’t align because not every atrial impulse leads to a strong, palpable beat and the stroke volume can vary beat to beat.

The other rhythms don’t fit this pattern. Atrial tachycardia tends to have a faster but regular rhythm with distinct P waves and a consistent AV conduction. Atrial flutter produces a sawtooth pattern with a more regular ventricular response unless variable block is present. Premature junctional complexes cause early, usually solitary beats that interrupt a regular rhythm but don’t create the ongoing irregularly irregular pulse characteristic of AF.