Patent ID: 11925807
Assignee: nan
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A method for operating a dual chamber pacemaker configured for atrial and ventricular pacing, the method comprising the following steps:
a. monitoring for:
i. an onset of retrogradely conducted atrial electrical excitation recorded in post-ventricular atrial refractory period (PVARP), or
ii. an increase in duration of time between retrograde atrial sense (AS) and atrial pace (AP) events over at least four successive cardiac cycles; or
iii. a duration of time between retrograde atrial sense (AS) and atrial pace (AP) events is at or less than 30 percent of the present cardiac cycle duration;

b. upon detection of either one of said events in step (a), extending an onset of atrial pacing stimulus by a predetermined interval, whereby avoiding atrial pacing during an atrial vulnerable period,
c. regardless of the VA interval, initiating for the same cardiac cycle as in step (b) an onset of ventricular pacing stimulus to coincide with the onset of atrial pacing stimulus, whereby eliminating atrio-ventricular delay and blocking both atrio-ventricular and ventriculo-atrial electrical conduction allowing prevention of further occurrence of repetitive non-reentrant ventriculo-atrial synchrony (RNRVAS), and
d. increasing the atrio-ventricular delay during at least 3 of the subsequent cardiac cycles after steps (b) and (c) from zero until reaching a physiologically acceptable value, while allowing for a change in heart rate,
whereby interrupting onset or continuation of said retrogradely conducted atrial electrical excitation recorded in the PVARP as a cause of competitive atrial pacing and preventing an onset of atrial tachycardia or atrial fibrillation as a consequence thereof.