Medscape

Atrial Overdrive Pacing Inducing QRS Complexes of Varying Duration in a Patient with Recurrent Syncope. What is the Mechanism?

Pacing Clin Electrophysiol. 2008;31(2):229-231. A 52-year-old man was admitted in our institution with cranial traumatism due to a syn-copal episode that occurred while he was walking. Several weeks ...
The New England Journal of Medicine

Electrocardiographic Criteria in the Differential Diagnosis of Pre-Excitation (Wolff–Parkinson–White Syndrome) and Arteriosclerotic Heart Disease

THE electrocardiographic picture of prolonged QRS-complex duration with short PR interval was the subject of isolated reports 1,2 until Wolff, Parkinson and White 3 described the clinical syndrome of ...
Healio

Heart Blocks ECG 12

This ECG shows ventricular pacing. Note the pacer spike prior to each QRS complex, most apparent in leads V5 and V6. The P waves appear sinus in origin and have no association with the QRS complexes ...
Healio

QRS Complex

The QRS complex consists of the Q wave, the R wave and the S wave. The QRS complex comes after the P wave when the SA nodal action potential travels through the AV node to the ventricles to cause ...