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Updated: Apr 14, 2026
A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
Published on: February 28, 2012
Breaking Frontiers-Leadless Atrial-Ventricular Hybrid Upgrade to Dual Chamber Leadless Pacemaker
João Mendes Cravo1, Diogo Rosa Ferreira1, Ana Abreu Bernardes2
1Department of Cardiology, ULS Santa Maria, Faculdade de Medicina, CAML, CCUL@RISE, Universidade de Lisboa, Lisboa, Portugal.
Introduction:
Leadless pacemakers (LP) have significantly reduced device-related complications compared with conventional systems, yet limitations in atrial pacing and atrioventricular (AV) synchrony restrict their widespread use.
Methods And Results:
We report an 87-year-old man with a history of stage 5 CKD on haemodialysis with complete AV block and a previously implanted Micra-AV who developed symptomatic sinus node dysfunction. To restore AV synchrony and avoid transvenous implantation, an Abbott AVEIR AR atrial LP was implanted, achieving functional dual-chamber leadless pacing. The procedure had no complications, and the follow-up demonstrated 89% AV synchrony with symptomatic improvement.
Conclusion:
This case demonstrates the feasibility of achieving a hybrid dual-chamber leadless pacing system from two different manufacturers in selected patients.
