Atrial Undersensing-Associated Premature Atrial Contractions: A Case Report

Oleksiy Skakun; Yaroslava  Vandzhura; Ihor  Vandzhura; Khrystyna  Symchych; Anton  Symchych

doi:10.5937/scriptamed55-50862

Oleksiy Skakun Clinic of St. Luka https://orcid.org/0000-0003-4745-9858
Yaroslava Vandzhura Ivano-Frankivsk National Medical University, Department of Internal Medicine #2 and Nursing https://orcid.org/0000-0003-2525-371X
Ihor Vandzhura Ivano-Frankivsk National Medical University, Department of Internal Medicine #2 and Nursing https://orcid.org/0000-0001-5905-487X
Khrystyna Symchych Ivano-Frankivsk National Medical University, Department of Therapy, Family and Emergency Medicine Postgraduate Education https://orcid.org/0000-0002-6519-8500
Anton Symchych Ivano-Frankivsk National Medical University, Department of General and Vascular Surgery https://orcid.org/0000-0002-4547-9938

DOI: https://doi.org/10.5937/scriptamed55-50862

Keywords: Artificial pacemaker, Atrial premature complexes, Heart block, Heart conduction systems

Abstract

Atrial undersensing is defined as the inability of the pacemaker to detect spontaneous atrial activity. A case of premature atrial contractions associated with atrial undersensing is presented. A 33-year-old woman presented with irregular heartbeat and general weakness. A single atrial stimulation (AAI) pacemaker was implanted seven years earlier for recurrent syncope associated with sinus arrest. Ambulatory ECG monitoring revealed multiple episodes of atrial undersensing resulting in premature atrial contractions (PACs). Occasionally, blocked PACs or PACs with aberrancy associated with atrial undersensing were seen. After improvement of atrial sensing, no episodes of undersensing were found and the complaints disappeared.

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