Atrial pacing in a patient with a Wolff-Parkinson-White syndrome pattern showed unusual variability in AV nodal conduction time. Changes in the AV nodal conduction time occurred predominantly at paced rates in excess of 100/min and consisted of abrupt or gradual decreases in the AH interval. Such decreases resulted in unexpected normalization of the QRS pattern. In addition, pacing also reveale...

The cardiac tachyarrhythmias can be divided into 2 major groups. A. Supraventricular B. Ventricular The supraventricular tachyarrhythmias, commonly seen in clinical practice are: 1. Supraventricular tachycardias. 2. Atrial flutter 3. Atrial fibrillation Supraventricular arrhythmias can be life threatening a. When associated with underlying LV dysfunction heart failure. b. In association with WP...

BACKGROUND Ebstein's anomaly is the most commonly occurring congenital abnormality associated with the Wolff-Parkinson-White (WPW) syndrome. However, the effects of Ebstein's anomaly on the risks and benefits of surgical ablation of accessory pathways in patients with WPW syndrome are unknown. METHODS AND RESULTS This study compared the long-term outcome of 38 WPW patients with Ebstein's anom...

BACKGROUND Virtually all natural history studies of Wolff-Parkinson-White (WPW) syndrome have been case series and, as such, have been constrained by referral biases, skewed age and sex distributions, or brief follow-up periods. The purpose of our study was to examine the natural history, the development of arrhythmias, and the incidence of sudden death in an entire cohort of pediatric and adul...

Background. Virtually all natural history studies ofWolff-Parkinson-White (WPW) syndrome have been case series and, as such, have been constrained by referral biases, skewed age and sex distributions, or brief follow-up periods. The purpose of our study was to examine the natural history, the development of arrhythmias, and the incidence of sudden death in an entire cohort of pediatric and adul...

BACKGROUND Sudden death (SD) in ventricular preexcitation (VP) syndrome is believed to be the result of atrial fibrillation with rapid ventricular response over the accessory pathway. Previous reports are anecdotal and often lack autopsy validation. METHODS AND RESULTS Prevalence and clinicopathological features of VP were investigated in a series of 273 SDs in children and young adults (aged...

Background. Virtually all natural history studies ofWolff-Parkinson-White (WPW) syndrome have been case series and, as such, have been constrained by referral biases, skewed age and sex distributions, or brief follow-up periods. The purpose of our study was to examine the natural history, the development of arrhythmias, and the incidence of sudden death in an entire cohort of pediatric and adul...

BACKGROUND We identified a gene (PRKAG2) that encodes the gamma-2 regulatory subunit of AMP-activated protein kinase (AMPK) with a mutation (Arg302Gln) responsible for familial Wolff-Parkinson-White (WPW) syndrome. The human phenotype consists of ventricular preexcitation, conduction abnormalities, and cardiac hypertrophy. METHODS AND RESULTS To elucidate the molecular basis for the phenotype...

Patients with a Wolff-Parkinson-White (WPW) pattern on their ECG can experience symptoms such as syncope, palpitations, supraventricular tachycardia, and atrial fibrillation, or they can be asymptomatic (aWPW). All patients with WPW, regardless of the presence or absence of symptoms, are at risk of sudden death. Therefore, it is recommended that younger patients with WPW undergo studies to dete...