A 65-year-old woman, who suffered from rheumatic heart disease with mitral regurgitation and stenosis, was admitted to the hospital on December 26, 1965, because of severe congestive heart failure. During 6 weeks of hospitalization, sinus rhythm alternated with atrial tachycardia associated with A-V block. When paroxysmal atrial tachycardia was present, the length of the basic atrial cycle was ...

Positive chronotropic effects from the combination of ouabain administration and rapid stimulation were sought in the atrium and ventricle of ten anesthetized vagotomized dogs with intact atrioventricular conduction during the infusion of ouabain (1 MgAg min") until the onset of ventricular tachycardia. Sinus rhythm was interrupted every minute by 15 seconds of atrial pacing at either 150 or 20...

The objective of this article is to review supraventricular arrhythmias emphasized the importance of atrial fibrillation (AF) and its novel therapeutic approach in dogs. Supraventricular arrhythmias include disturbances of impulse formation at sinus node, atria and junctional area or alterations of impulse conduction within the chamber above ventricles. Among those supraventricular arrhythmias,...

A 60-year-old woman was referred for radiofrequency catheter ablation of narrow QRS tachycardia that was terminated with intravenous adenosine. Twelve-lead ECG showed no baseline preexcitation. Echocardiogram was essentially normal. The electrophysiological study showed a normal AH interval of 114 ms and HV interval of 48 ms during sinus rhythm. Anterograde study demonstrated no dual AV nodal p...

A 70-year-old gentleman was referred for radiofrequency catheter ablation of wide QRS tachycardia that was not terminated with intravenous adenosine. Twelve-lead ECG was normal during sinus rhythm and transthoracic echocardiography demonstrated no evidence of structural heart disease. The electrophysiological study showed a normal AH interval of 104 m and HV interval of 45 m during sinus rhythm...

To study the pathway of tachycardia in patients with the Wolff-Parkinson-White (WPW) syndrome and reciprocal tachycardias, results from intracavitary recordings and atrial and ventricular stimulation were reviewed in 71 patients with the WPW syndrome and 54 patients without pre-excitation. In all patients a reproducible tachycardia could be initated and terminated by appropriately timed electri...

AIMS The purpose of this study was to evaluate a retrograde approach for radiofrequency (RF) ablation of ectopic atrial tachycardias (EATs) with an early atrial activation at the His site. METHODS AND RESULTS This study included 12 patients with EAT. During tachycardia, earliest atrial activation was recorded at the His site at a standard catheter setting. Activation mapping was performed in ...

Plasma atrial natriuretic peptide was measured in 13 children between the ages of 1 week and 2 years 9 months during atrioventricular re-entrant tachycardia and 15 minutes after the restoration of sinus rhythm. There was a significant decline in atrial natriuretic peptide during sinus rhythm. Plasma concentrations of the peptide were significantly higher during tachycardia in seven infants unde...

Diazepam did not alter the rate or rhythm in III patients with atrial fibrillation. In 3 out of 38 patients with atrial flutter the use of diazepam was followed by an increase in atrioventricular block. Diazepam restored sinus rhythm in I patient with atrial tachycardia (total 7 patients) and in I patient with ventricular tachycardia (total 8 patients). Experimentally in the dog diazepam raised...

OBJECTIVE The aim of this retrospective study was to investigate the association of atrioventricular nodal reentrant tachycardia (AVNRT) with other forms of arrhythmia in individual patients and its consequences for treatment. SUBJECTS AND METHODS This study comprised 493 consecutive patients aged 16-88 years (296 women and 197 men) who were diagnosed with a form of AVNRT via a standard 4-cat...