Two patients with a history of paroxysmal supraventricular tachycardia but no evidence of the Wolff-Parkinson-White syndrome in the conventional electrocardiograms were studied utilizing atrial and ventricular extrastimuli. The evidence obtained in these patients was consistent with a concealed Wolff-Parkinson-White syndrome. In one patient,, ventricular extrastimuli revealed three different re...

34. Birkhead JS, Vaughan Williams EM: Dual effects of disopyramide on atrial and atrioventricular conduction and refractory periods. Br Heart J 39: 657, 1977 35. Desai JM, Scheinman M. Peters RW. O'Young J: Electrophysiological effects of disopyramide in patients with bundle branch block. Circulation 59: 215, 1979 36. LaBarre A, Strauss HC, Scheinman MM, Evans GT. Bashore T, Tiedeman JS, Wallac...

A case of recent myocardial infarction in a 24-year-old man with no known history of Wolff—Parkinson— White syndrome is reported. The patient developed during sport training an exercise tachycardia associated with palpitation and syncope. The electrocardiogram, performed by rescue team, was suggestive of Wolff-Parkinson-White syndrome. He was admitted to Cardiovascular Diseases Institute for th...

BACKGROUND Atrial flutter with 1:1 atrioventricular conduction via an accessory pathway is an uncommon presentation of Wolff-Parkinson-White syndrome not previously reported in the emergency medicine literature. Wolff-Parkinson-White syndrome, a form of ventricular preexcitation sometimes initially seen and diagnosed in the emergency department (ED), can present with varied tachydysrhythmias fo...

OBJECTIVES To review the clinical experience, complications and outcome of Cardiac Electrophysiology Studies and Catheter Radiofrequency Ablation in treatment of supraventricular tachycardias in Karachi. METHODS A retrospective review of records of all patients who underwent an electrophysiological study and radiofrequency ablation at National Institute of Cardiovascular Diseases and Aga Khan...

Hypertrophic cardiomyopathy (HCM) is an autosomal dominant heart disease that is the most common genetic cardiac disorder. The disease is characterized by excessive thickening of the left ventricular myocardium. The anterior portion of the interventricular ventricular septum is often involved. Asymmetric hypertrophy of apical site, left ventricular free wall, and right ventricle are less common...

Current and evolving echocardiographic techniques for the quantitative evaluation of cardiac mechanics: ASE/EAE Consensus Statement on Methodology and Indications. Endorsed by the Japanese Society of Echocardiography. European association of echocardiography recommendations for standardization of performance, digital storage and reporting of echocardiographic studies. et al. Test-retest reliabi...

Among patients with a Wolff–Parkinson–White (WPW) syndrome, approximately half will experience arrhythmia during their lifetime. Radiofrequency catheter ablation of the accessory atrioventricular pathway is the treatment of choice for this condition and is associated with a high success rate. Electrophysiology study is indeed the key procedure for identifying the target of radiofrequency ablati...

IN 1930, Wolff, Parkinson, and Vhite 1 described a syndrome characterized by an abnormal and distinctive type of electrocardiogram and an associated tendency for sudden attacks of supraventricular arrhythmias. There has been controversy regarding the priority of the description of the electrocardiographic pattern, and widely differing theories of the pathogenesis of the syndrome have been propo...