Circus movement in canine right ventricle.

Circus movement in canine right ventricle.

The present study reports on the epicardial spread of excitation during premature beats and during the initial stages of ventricular fibrillation, both of which were induced by single-test stimuli during regional ischemia or local hypothermia. Simultaneous recording of the activity at 48 epicardial sites on the right ventricle of dog hearts enabled us in some instances to demonstrate a circus m...

Regional shortening patterns in canine right ventricle.

The right ventricular outflow tract (OT) is a functionally distinct area of the right ventricle. However, there is little information on the contrdingly, inflow tract (IT) and OT chords and right ventricular free wall segmental changes were measured with implanted ultrasound crystals. The timing and extent of shortening of IT and OT chords and free wall segments were determined both at rest and...

A Unified Functional/Anatomic Substrate for Circus Movement A Rutter: Activation and Refractory patterns the Canine Right A Enlargement Model

Relation to Circus-Movement Flutter

Certain characteristics of aconitine-induced auricular arrhythmias in dogs and the responses of aconitine-induced flutter to various experimental procedures and to drugs are described. In certain experiments there was evidence that a secondary flutter mechanism had developed which, in some instances, resembled flutter of circus-movement origin. When aconitine-induced and circus-movement flutter...

Efferent sympathetic and vagal innervation of the canine right ventricle.

BACKGROUND The functional pathways of efferent sympathetic and vagal innervation to the right ventricle (RV) might be important in a variety of disease states that involve the RV wall. The purpose of this study was to investigate those pathways. METHODS AND RESULTS We determined the effects of phenol and endocardial radiofrequency ablation applied to the RV anterolateral wall and outflow trac...