A regular rhythm with narrow QRS complexes,indistinguishable P waves,and a heart rate of 155 would be consistent with
A)Atrial fibrillation.
B)Supraventricular tachycardia.
C)Sinus bradycardia.
D)Ventricular tachycardia.

Question

Quizplus · Accepted Answer

Supraventricular tachycardia (SVT) is a regular rhythm originating from above the ventricles with a heart rate >100 bpm. In SVT, P waves may not be distinguishable from the QRS complexes, and the QRS complexes are narrow (<0.12 sec) because the impulse is conducted rapidly through the normal conduction system. Atrial fibrillation (A) is an irregular rhythm with no identifiable P waves, and the QRS complexes may be narrow or wide. Sinus bradycardia (C) is a regular rhythm with a heart rate <60 bpm and normal P waves. Ventricular tachycardia (D) is a regular or irregular rhythm originating from the ventricles with a heart rate >100 bpm, and the QRS complexes are wide (>0.12 sec) because the impulse originates in a ventricular focus.

A Regular Rhythm with Narrow QRS Complexes,indistinguishable P Waves,and a Heart