Pacemaker mediated tachycardia response for VDD and VDDR modalities

摘要: A pacemaker mediated tachycardia (PMT) is detected and suppressed in an implantable operating the VDD or VDDR modality. Such suppression effectuated by extending post ventricular atrial refractory period (PVARP) of to extended PVARP that prevents retrograde P-waves from being tracked, thereby suppressing PMT. The includes a window portion, following absolute portion. occur during portion are deemed be P-waves. returned its original value whenever: (1) P-wave sensed PVARP, which sinus P-wave, (2) whenever sufficient number cardiac cycles elapse without occurrence P-wave.