1. Inappropriate subcutaneous implantable cardioverter-defibrillator therapy due to R-wave amplitude variation: Another challenge in device management 
Syeda A. Batul, MD, Felix Yang, MD, FHRS, Karan Wats, MBBS, Suvash Shrestha, MBBS, Yisachar J. Greenberg, MD, FHRS 
HeartRhythm Case Reports 
Volume 3, Issue 1, Pages (January 2017)
DOI: /j.hrcr
Copyright © 2016 Heart Rhythm Society Terms and Conditions

2. Figure 1
Subcutaneous implantable cardioverter-defibrillator interrogation strip displaying patient in sinus tachycardia. Overcounting and inappropriate therapy resulted from signal rectification in the presence of tall R waves and shift in baseline.
HeartRhythm Case Reports 2017 3, 78-82DOI: ( /j.hrcr )
Copyright © 2016 Heart Rhythm Society Terms and Conditions

3. Figure 2 Alternate vector selection with lowest amplitude R wave.
HeartRhythm Case Reports 2017 3, 78-82DOI: ( /j.hrcr )
Copyright © 2016 Heart Rhythm Society Terms and Conditions

4. Figure 3
Baseline offset with high QRS amplitude decreased the QRS/T-wave ratio and an increased predisposition to oversensing. ECG = electrocardiogram. © Boston Scientific, published with permission.
HeartRhythm Case Reports 2017 3, 78-82DOI: ( /j.hrcr )
Copyright © 2016 Heart Rhythm Society Terms and Conditions

5. Figure 4
Recreated oversensing event with nonzero baseline, high QRS amplitude, and slew rates during internal testing. © Boston Scientific, published with permission.
HeartRhythm Case Reports 2017 3, 78-82DOI: ( /j.hrcr )
Copyright © 2016 Heart Rhythm Society Terms and Conditions