What variance in RR intervals must be present to be considered sinus arrhythmia?
A) more than 10%
B) more than 20%
C) more than 30%
D) more than 40%

Question

Quizplus · Accepted Answer

Sinus arrhythmia is defined as a variation in the heart rate during respiration, where the RR interval increases with inspiration and decreases with expiration. A variance in RR intervals of more than 10% is considered sinus arrhythmia. Variance levels greater than 20-30% may indicate other arrhythmias, such as atrial fibrillation or premature atrial contractions. Therefore, A) more than 10% is the correct choice for sinus arrhythmia.

What Variance in RR Intervals Must Be Present to Be