Numerous authors have claimed to demonstrate independent rhythms in the 2 atria. Hering' in 1900 first recorded dissociation of the atria in the experimental animal, whereas Wenckebach' in 1906 was first to report it in man. Neither of these authors illustrated his claim with published electrocardiograms. A number of these publications invite special comment. Schrumpf3 published the first illus...

Double dissociated tachycardias: isorhythmic A-V dissociation at rapid atrial and ventricular rates" (2005).

AIMS This study aims to determine the degree and mechanisms of endo-epicardial dissociation of electrical activity during atrial fibrillation (AF) and endo-epicardial differences in atrial electrophysiology at different stages of atrial remodelling. METHODS AND RESULTS Simultaneous high-density endo-epicardial mapping of AF was performed on left atrial free walls of goats with acute AF, after...

Ten patients with mechanical pulsus alternans were studied by echocardiography and mechanocardiography. All had been or were in congestive heart failure. An atrial mechanism for pulsus alternans could be identified in two patients: one with primary congestive cardiomyopathy and one after aortic valve replacement for calcific aortic stenosis. Each strong systole was preceded by an "a" wave, whil...

Differentiation of wide QRS complex tachycardias on surface electrocardiograms is difficult for physicians and computers due in part to their inability to identify atrial activity, specifically atrioventricular (AV) dissociation. We studied 20 examples ofAV associated rhythms and 17 examples ofAV dissociated ventricular tachycardia. We applied an algorithm consisting of subtraction of a mean be...

Thrombus formation in the left atrium is rare in patients in sinus rhythm. In three patients with extensive cardiac amyloidosis transthoracic echocardiography showed large atrial thrombi in or protruding into the body of the left atrium during sinus rhythm. Doppler studies showed no A wave on mitral inflow. Severe atrial and ventricular infiltration by amyloid may have resulted in mechanical at...

This is the report of a case of fetal tachyarrhythmia with 1:1 atrioventricular conduction detected by pre-natal echocardiography in a fetus at 25-weeks gestation. Adenosine infusion via cordocentesis was performed as a diagnostic test to differentiate between atrioventricular nodal reentrant supraventricular tachyarrhythmia and atrial flutter. After infusion, transient 2:1 atrioventricular dis...

We report of an interatrial dissociation after two relatively limited left atrial ablations for paroxysmal atrial fibrillation (PAF), with sinus rhythm in the right atrium and ongoing atrial tachycardia (AT) in the left atrium (LA). Patients suffering from PAF are supposed to have less electrical and anatomical remodelling; however, the role of low-voltage and scar areas with functional conduct...