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Introduction: Micra AV Transcatheter Pacing System (TPS) represents an innovative second‐generation leadless pacemaker which represents an effective alternative to conventional devices in selected cases. Intrinsic malfunctions of these devices are rare, requiring sometimes their retrieval. When performed in experienced centers, this procedure is safe. Case Presentation: We describe a case of sudden battery malfunction of a Micra AV TPS, which required the extraction and the placement of a new pacing system in the right ventricle. Discussion: This case, which has never been reported, highlights the need to a careful fluoroscopic evaluation and the usefulness of remote monitoring. [ABSTRACT FROM AUTHOR]

Introduction: The importance of atrio‐ventricular synchrony pacing in sinus rhythm patients is known. To identify patients in whom leadless pacemakers are able to guarantee this atrio‐ventricular synchrony, we explored correlations among echocardiographic measures of left atrial (LA) size and function (doppler parameter and strain) with A4 amplitude in patients implanted with new generation Micra‐AV device. Methods: After implantation with Micra‐AV system, patients underwent device interrogation to evaluate AV synchrony based on the sensing of atrial mechanics and echocardiographic exam to assess LA morphology and LA function. Results: In the 21 studied patients (14 males, 72 ± 13 years), the A4 wave amplitude values inversely correlated with LA antero‐posterior diameter, LA volume, LA contraction strain and LA conduit strain, while they were positively related with LA reservoir strain. Discussion: Our results indicate a statistically significant relationship between morphological echocardiographic LA parameters and atrial contraction signal (A4), detected by leadless pacemakers and used to synchronize ventricular pacing with the atrium. Instantaneous LA function assessment obtained with LA strain provides incremental information over morphological parameters. LA strain evaluates atrial myocardial deformation during the whole cardiac cycle. We found higher value of A4 in patients that have grater absolute value of LAsr, LAscd and LAsct, that are simple and measurable parameters of LA functional capacity. Conclusion: Preimplant echocardiographic evaluation of the atrial contractility may be useful in predicting adequate A4 sensing and consequently a good atrio‐ventricular synchrony pacing. Echocardiography LA strain study seems promising in Micra‐AV patient selection. [ABSTRACT FROM AUTHOR]