BACKGROUND Late potentials (LP) detected with signal-averaged ECGs are known to be useful in identifying patients at risk of Brugada syndrome (BS) and arrhythmogenic right ventricular cardiomyopathy (ARVC). Because the pathophysiology is clearly different between these disorders, we clarified the LP characteristics of these disorders. METHODS AND RESULTS This study included 15 BS and 12 ARVC ...

We developed a new approach to feature extraction and shape representation of QRS complex and ST segment pattern vectors of ambulatory electrocardiograms using the Karhunen-Loève transform. We describe applying the Karhune-Loève transform to the ambulatory electrocardiogram, derivation of robust covariance matrices using kernel-approximation method and with noisy patterns excluded, a method to ...

Signal-averaged ECG (SAECG) is a high-resolution, noninvasive electrocardiographic method enabling detection of late ventricular potentials (LVP), which are low-amplitude and high-frequency signals, predicting reentry ventricular arrhythmias, and sudden cardiac death (SCD). Three criteria are used to detect late ventricular potentials as follows: signal-average ECG QRS duration (SAECG-QRS), the...

background: neonatal lupus erythematosus is an uncommon disease. congenital complete heart block (cchb) usually happens in neonates with maternal systemic lupus erythematosus. the most prevalent presentation of cchbis bradycardiathatcanbediagnosed through an electrocardiogram. case report: here in, we present the case of a full-term male neonate with gestational age of 37 weeks and birth weight...

BACKGROUND Although fragmented QRS complex (frag-QRS) reflecting intra-ventricular conduction delay has been shown to be a prognostic marker for cardiac events, few data exist regarding the impact of frag-QRS on cardiac events in hypertrophic cardiomyopathy (HCM). METHODS AND RESULTS Ninety-four HCM patients (56 male; mean age, 58 ± 17 years) were retrospectively investigated. Frag-QRS was de...

The time and sequence of epicardial activation was determined by measuring the onset of activation at 26 to 47 representative epicardial sites on each ventricle. Normal dogs and dogs with right ventricular hypertrophy resulting from various congenital heart lesions were studied. The total right ventricular epicardial activation time was slightly prolonged (10 msec) in some dogs with right ventr...

Small, high-frequency electrocardiographic signals were recorded from the body surface in 39 patients with and 27 patients without ventricular tachycardia (VT). All patients were in normal sinus rhythm, had a previous myocardial infarction, were not taking antiarrhythmic drugs, and did not have bundle branch block. Bipolar X, Y, Z leads were signal averaged and processed by a bidirectional digi...

having a broad QRS complex, it is important to be able to diVerentiate between a supraventricular and a ventricular tachycardia. Medication given for the treatment of a supraventricular tachycardia (SVT) may be harmful to a patient with a ventricular tachycardia (VT). 2 A reasonable haemodynamic condition during a tachycardia may erroneously lead to the wrong diagnosis of SVT. Familiarity with ...