At other times in the tracing, the PR interval is normal and the QRS complexes are narrow. ... the tracing may simulate either ventricular bigeminy or electrical alternans.

It is also not ventricular tachycardia because the narrow QRS complexes march through. This tracing is an example of muscle tremors simulating either atrial flutter or ventricular tachycardia. 1 2 ...

Unlike premature atrial contractions, or PACs, usually narrow-complexed because they use the normal ventricular conduction system (unless a baseline right or left bundle branch block is present).

Diagnosis | Idiopathic paroxysmal ventricular bigeminy and premature ventricular complexes Lab Animal volume 37 , pages 300–301 ( 2008 ) Cite this article 151 Accesses ...

Bleeker, GB, Holman, ER, Steendijk, P, et al. Cardiac resynchronization therapy in patients with a narrow QRS complex. J Am Coll Cardiol 2006;48:2243-2250 Crossref ...

Cardiac-resynchronization therapy (CRT) reduces morbidity and mortality in chronic systolic heart failure with a wide QRS complex. Mechanical dyssynchrony also occurs in patients with a narrow QRS ...