Sinus arrhythmia is
A)a regular rhythm.
B)an irregular rhythm.
C)a rhythm that originates in the atria.
D)a rhythm that originates in the AV junction.

Question

Quizplus · Accepted Answer

Sinus arrhythmia is an irregular rhythm characterized by a variation in the heart rate that is modulated by respiration. The rhythm originates in the sinoatrial node, but its cycle length varies with respiration. As inhaling increases heart rate and exhaling decreases the heart rate resulting in variation, thus making it an irregular rhythm.

Sinus Arrhythmia Is