T-wave oversensing from postural changes: A rare cause of inappropriate shock from a subcutaneous defibrillator Muhammad R. Afzal, MD, Auroa Badin, MD,

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Presentation transcript:

T-wave oversensing from postural changes: A rare cause of inappropriate shock from a subcutaneous defibrillator Muhammad R. Afzal, MD, Auroa Badin, MD, Raul Weiss, MD, Ralph Augostini, MD, John D. Hummel, MD HeartRhythm Case Reports Volume 3, Issue 8, Pages 380-383 (August 2017) DOI: 10.1016/j.hrcr.2017.04.004 Copyright © 2017 Heart Rhythm Society Terms and Conditions

Figure 1 Figure shows the inappropriate shock due to reduction of QRS amplitude and thus leading to T-wave oversensing. HeartRhythm Case Reports 2017 3, 380-383DOI: (10.1016/j.hrcr.2017.04.004) Copyright © 2017 Heart Rhythm Society Terms and Conditions

Figure 2 Figure showing the electrograms from the programmer in the primary, secondary, and alternate vectors in the supine posture. There is no evidence of reduction in the amplitude of QRS and, thus, T-wave oversensing. HeartRhythm Case Reports 2017 3, 380-383DOI: (10.1016/j.hrcr.2017.04.004) Copyright © 2017 Heart Rhythm Society Terms and Conditions

Figure 3 Figure showing the electrograms from the programmer in the primary, secondary, and alternate vectors in the left lateral position. There is significant reduction in the amplitude of QRS and, thus, T-wave oversensing in the primary and secondary vectors. The alternate vector is unaffected and was programmed as the sensing vector. HeartRhythm Case Reports 2017 3, 380-383DOI: (10.1016/j.hrcr.2017.04.004) Copyright © 2017 Heart Rhythm Society Terms and Conditions