“Pseudosinus Rhythm”: What Is the Mechanism?

The article comments on the mechanism of pseudosinus rhythm. According to the author the potential mechanisms of the dissociated sinus rhythm were postulated as the origin of the arrhythmogenic foci that were from the superior vena cava (SVC) and right superior pulmonary vein (RSPV), with exit block from both sites, resulting in the dissociated right and left atrial activities. Another is the arrhythmogenic focus originated in the SVC with exit block, and far-field potentials from the SVC were recorded in the RSPV. Recent evidence indicates that focal electric firing originating from the SVC can initiate paroxysmal atrial fibrillation.