Electrocardiogram Showing Both Tachycardia and Prominent J Wave

Idiopathic ventricular fibrillation with fragmented QRS complex and J wave in resting electrocardiogram

OBJECTIVE To describe the clinical characteristics of idiopathic ventricular fibrillation (IVF) with fragmented QRS complex (f-QRS) and J wave in resting electrocardiogram. METHODS We reviewed data from 21 case subjects in our hospital who were resuscitated after cardiac arrest due to IVF and assessed the prevalence of f-QRS and J wave in resting electrocardiogram (ECG). All the case subjects...

Tachycardia-Induced J-Wave Changes in Patients With and Without Idiopathic Ventricular Fibrillation.

BACKGROUND To know the underlying mechanisms of J waves, the response to atrial pacing was studied in patients with idiopathic ventricular fibrillation (IVF) and patients with non-IVF. METHODS AND RESULTS In 8 patients with IVF, the J-wave amplitude was measured before, during, and after atrial pacing. All patients had episodes of ventricular fibrillation without structural heart disease. The...

A supraventricular tachycardia showing alternation of the QRS interval

In case of the first possibility (AVRT), an accessory pathway is responsible for the retrograde limb of the tachycardia circuit (there is no evidence for anterograde conduction over the accessory pathway on the ECG in sinus rhythm, as show in Fig. 1b of the question). Therefore a ‘concealed’ accessory pathwaymust be present. Anterograde conduction occurs over a dual AV nodal pathway (Fig. 2, up...

Diagnosing Supraventricular Tachycardia: When Physical Examination Trumps the Electrocardiogram.

The enigmatic sixth wave of the electrocardiogram: the U wave.

The U wave is the last, inconstant, smallest, rounded and upward deflection of the electrocardiogram. Controversial in origin, it is sometimes seen following the T wave with the TU junction along the baseline or fused with it and before P of the following cycle on the TP segment. In this review we will study its temporal location related to monophasic action potential, cardiac cycle and heart s...