In sinus arrhythmia, a gradual increasing of the heart rate is usually associated with _____.
A) expiration
B) inspiration
C) excessive caffeine intake
D) early signs of heart failure

Question

Quizplus · Accepted Answer

Sinus arrhythmia that is associated with the phases of breathing and changes in intrathoracic pressure is called respiratory sinus arrhythmia. The rhythm is irregular; the heart rate increases gradually during inspiration (R-R intervals shorten) and decreases with expiration (R-R intervals lengthen).

In Sinus Arrhythmia, a Gradual Increasing of the Heart Rate