Figure 87

Electrocaridogram lead II demonstrating atrial pacing. Following the stimulus artifact there are P waves with normal AV conduction. In this example, there are no sinus P waves and thus no pacemaker inhibition (the pacemaker kept firing and created its own P waves).

Mond, H.G., MD, Permanent Cardiac Pacemakers: Techniques of Implantation, Testing, and Surveillance, Hurst's The Heart, 8th ed., p 815-841