Pacemaker channel dysfunction in a patient with sinus node disease
J. Clin. Invest. Eric Schulze-Bahr, et al. 111:1537 doi:10.1172/JCI16387 [Go to this article.]

Figure 1
(a) Baseline electrocardiogram of the index patient showing marked sinus bradycardia (41 bpm). (b) ECG recorded during an episode of intermittent atrial fibrillation. (c) P-wave histograms obtained from pacemaker interrogation after implantation. At day 68, 98% of the atrial rates were below a threshold level of 60 bpm. (d) Heart rates (at sinus rhythm) of the index patient during bicycle exercise, before pacemaker implantation. The vertical dotted line and gray area indicate the predicted mean maximal work performance ± SD (with respect to the patient’s age [65–70 years] and gender) (25). The dotted horizontal line indicates the predicted heart rate value during maximal work load for women 66 years of age (25).