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Updated: Aug 26, 2025

Bidirectional Electrical and Optoelectronic Interfaces in Healthy and Ischemic Ex Vivo Rat Hearts
Published on: July 18, 2025
Risks of inappropriate use of an algorithm favouring intrinsic conduction
Armando Lo Savio1, Bruna Crea2, Giuseppe Dattilo1
1Cardiology Unit, Department of Clinical and Experimental Medicine, University Hospital, of Messina, Messina, Italy.
Abstract:
An 80-year-old woman received a dual chamber pacemaker (Boston Scientific Accolade MRI DR) for pre-syncopal episodes associated with transient II-degree atrioventricular block type 1 and 2:1, recorded in 24-h Holter monitoring. Due to residual AV conduction with I-degree AV block, the pacemaker was set with the RYTHMIQ® algorithm, in order to reduce inappropriate ventricular pacing. A month later the patient started to complain of severe asthenia and bradycardia (46-48 bpm). Telemetry-supported pacemaker control revealed III-degree AV block with junctional escape rhythm, unmasking missed switch of RYTHMIQ® algorithm.
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