Abstract
An atrial pacing threshold is shown ( Figure 1A ). Modality of pacing is AAI at 90 bpm. The first paced beat is followed by two consecutive ventricular depolarizations. The second atrial paced beat is not followed by any ventricular-related sensed beat. The third is normally conduced to the ventricles. The electrocardiographic behaviour observed concomitantly to the first two atrial paced beats is explained with a double response ( Figure 1B ) (antegrade conduction over both the fast and the slow AV-nodal pathway) followed by a pseudo-atrioventricular block due to collision of the following antegrade impulse generated by atrial …
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