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Samples in periodicals archive:
In this patient's electrocardiogram the sinus-initiated P waves and the junction-initiated QRSs occur virtually simultaneously, and each occurs in the absolute refractory period of the other so that there are no atrial or ventricular captures.
Unlike with pacemaker signals, which are delivered during a period of the cardiac cycle when a new beat can be initiated, the CCM signals are "non-excitatory," meaning they are delivered during the absolute refractory period and therefore cannot initiate a new contraction.
Based on a new method known as Cardiac Contractility Modulation (CCM), the OPTIMIZER(TM) delivers non-excitatory impulses to the heart during a period of time called the absolute refractory period (ARP).