Sleep modulation syndrome

Fig. 19.12 Event histogram from a patient implanted with a Trilogy DR+. The indication for pacing was the bradycardia-tachycardia syndrome. Over the past 42 days, the majority of the complexes were in the base rate or sleep rate bins. Rate modulation had not yet been enabled and there were relatively few native atrial rates above 75 bpm. The system functioned in a nontracking mode approximately 3% of the time (AMS bin) with 1,776 mode switch episodes. Based on this event histogram demonstrating the presence of chronotropic incompetence, rate-modulation was enabled.

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