The paper describes the clinical case of an elderly patient with heart failure, the possessor of a dual-chamber pacemaker programmed in DDD mode, in whom a complete interatrial block with left atrial standstill was diagnosed. The authors discuss the physiopathological aspect of the case which is a paradigmatic example of the problems related to dual-chamber pacing. In particular, the utility of an echo-Doppler assessment of the mechanical activity of the atria is emphasized together with a careful choice of the optimal atrioventricular delay in programming and the follow-up of dual-chamber pacing.
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