In which dysrhythmia do the P-P and R-R intervals progressively widen, and then narrow, following the patient's breathing pattern?
A)Sinus tachycardia
B)Sinus dysrhythmia
C)Sinus bradycardia
D)Normal sinus rhythm

Question

Quizplus · Accepted Answer

This pattern is characteristic of sinus dysrhythmia, which is caused by changes in intrathoracic pressure during breathing. The P-P and R-R intervals will shorten during inspiration and lengthen during expiration, resulting in a narrow and wide pattern that follows the patient's breathing. Sinus tachycardia and sinus bradycardia do not follow a consistent pattern based on breathing, and normal sinus rhythm has consistent intervals.

In Which Dysrhythmia Do the P-P and R-R Intervals Progressively