A patient with tetralogy of Fallot who developed cyanosis and tachypnea during spontaneous attacks of paroxysmal atrial tachycardia had an increase in right-to-left shunting with a fall in arterial oxygen saturation from 96 to 43%. Duplication of the fast heart rate by atropine and atrial pacing reproduced these hemodynamic changes, while slowing the rate with propranolol reversed this effect. ...

We report two cases of pseudo inferior wall myocardial infarction where ST segment elevation in inferior leads was caused by hyperkalemia and atrial tachycardia respectively. Only one case of pseudo inferior Ml caused by hyperkalemia has been reported so far and atrial tachycardia as a cause has hitherto been unreported.

Focal left atrial tachycardia (FLAT) although a common cause of supraventricular tachycardia(SVT) among children, the one's arising from left atrial appendage (LAA) present a unique challenge for successful ablation because of anatomical location. We present two children with FLAT arising from the epicardial LAA, successfully mapped and ablated through percutaneuous epicardial approach.

A 29-year-old woman without known medical illness was evaluated for incessant palpitations. She presented to an emergency department multiple times, where various diagnoses were made, including junctional tachycardia, atrial tachycardia, and atrial fibrillation. Therapy with propafenone, metoprolol, and rivaroxaban was initiated, but her symptoms continued. Echocardiography did not show evidenc...

BACKGROUND Supraventricular tachycardia (SVT) is common in complex congenital heart disease (CCHD) patients with single-ventricle physiology and may cause hemodynamic deterioration. We reported the outcomes of catheter ablation for such complex SVT in these single-ventricle CCHD patients. METHODS AND RESULTS Patients with single-ventricle physiology (defined as CCHD patients) who received ele...

Among patients with Wolff-Parkinson-White syndrome, atrioventricular reciprocating tachycardia (AVRT) and atrioventricular nodal reentrant tachycardia (AVNRT) can coexist in a single patient. Direct transition of both tachycardias is rare; however, it can occur after premature atrial or ventricular activity if the cycle lengths of the two tachycardias are similar. Furthermore, persistent atrial...

A 65-year-old woman underwent an electrophysiologic procedure because of a 20-year history of paroxysmal supraventricular tachycardia. The baseline sinus cycle length was 800 msec, with an atrial-His interval (AH) of 100 msec and a His-ventricular interval (HV) of 40 msec. There was evidence of dual AV nodal pathways, but no inducible tachycardia. During infusion of isoproterenol, the sinus cyc...

The authors investigated the effect of adenosine or ATP on narrow QRS tachycardia in 56 pts, 3 pts with wide QRS tachycardia 9 pts with suspected latent preexcitation and 10 pts with PVC suspected to be ventricular parasystole. After the bolus iv. administration of adenosine or ATP every SVT was stopped related to AV node (44 pts), but in the rest twelve related to atrial origin of SVT only one...

Pacemaker-mediated tachycardia (PMT) also called endless loop tachycardia is a macro-reentrant dual chamber pacemaker tachycardia conceptually similar to spontaneous reentrant supraventricular tachycardias (atrioventricular [AV] node reentrant tachycardia and orthodromic reciprocating tachycar-Figure 1. Termination of pacemaker-mediated tachycardia (PMT) by an atrial extrasystole. The tracing s...

With the introduction of dual chamber pacemakers that have multiple atrial amplitude sensing values, selective P wave sensing is possible. Five consecutive patients were studied who had 1) retrograde atrioventricular conduction, 2) anterograde atrial signals that were at least 1.4 times larger than their corresponding retrograde atrial signals, and 3) dual chamber pulse generators that are capa...