Utility of the Novel Auto + A3 Threshold Function in Maintaining Atrioventricular Synchrony

Ryo Ohinata; Naoya Inoue; Shuji Morikawa

doi:10.1111/pace.15119

Utility of the Novel Auto + A3 Threshold Function in Maintaining Atrioventricular Synchrony

Pacing Clin Electrophysiol. 2025 Jan;48(1):79-82. doi: 10.1111/pace.15119. Epub 2024 Dec 10.

Authors

Ryo Ohinata¹, Naoya Inoue^{1

2}, Shuji Morikawa^{1

2}

Affiliations

¹ Department of Cardiology, Chutoen General Medical Center, Kakegawa, Shizuoka, Japan.
² Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan.

PMID: 39654487
DOI: 10.1111/pace.15119

Abstract

Introduction: The VDD-leadless pacemaker aims to maintain high atrioventricular (AV) synchrony, but proper sensing setup is crucial.

Methods and results: This case was an elderly woman with an AV block who received a dual-chamber pacemaker. Due to ventricular pacing failure, a Micra AV2 was implanted. However, postimplantation, high sinus rate, and frequent premature ventricular contractions were noted. Therefore, the auto + A3 threshold function was used in the atrial-sensing setup. A few days later, the MAM test confirmed good AV synchrony.

Conclusion: The auto + A3 threshold function equipped in the Micra AV2 may offer to maintain high AV synchrony.

Keywords: Micra AV2; atrioventricular block; atrioventricular synchrony; auto + A3 threshold.

Publication types

Case Reports

MeSH terms

Aged
Aged, 80 and over
Atrioventricular Block* / physiopathology
Atrioventricular Block* / therapy
Electrocardiography
Equipment Design
Female
Humans
Pacemaker, Artificial*