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A schematic showing normal conduction from the sinoatrial (SA) node, through the right and left atria (RA, LA), the AV node, and the right and left ventricles (RV, LV). In the absence of an abnormal retrograde pathway, ORT can be simulated (as depicted by the loop containing the computer) by fixed-delay stimulation of the right atrium (at time A) at an interval, VA, after detection of ventricular activation (at time V).
