The ECG In Practice by Hampton John R

Author:Hampton, John R. [Hampton, John R.]
Language: eng
Format: epub
ISBN: 9780702052446
Publisher: Elsevier Health Sciences UK
Published: 2013-08-01T00:00:00+00:00

Fig. 4.29 DDD pacing: atrial and ventricular pacing

Note

• Continuous atrial and ventricular pacing throughout

• Pacing spikes precede both P waves and QRS complexes

Atrial pacing followed by ventricular pacing in lead II

When the intrinsic atrial rate exceeds the threshold for atrial pacing, ‘atrial tracking’ occurs. Atrial sensing takes place, but the intrinsic PR interval is longer than the programmed AV delay - leading to ventricular pacing. The ECG shows no atrial pacing spikes, but shows spontaneous P waves followed by ventricular pacing spikes and paced ventricular beats ( Fig. 4.30).

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