Experimental: Pacing intervention
A novel atrial pacing approach will be delivered using the subject’s already implanted pacemaker, ICD or BiV/ICD while the subject is in a semi-recumbent position and while hemodynamic and symptom data is collected. This will be repeated once daily, 3d/wk over 4 weeks.
Other: novel atrial pacing approach
See US Patent #10987516. An atrial pacing method that preserves atrioventricular and interventricular synchrony to reproduce an exercise-typical envelope of heart rate.
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