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Case Reports
. 2016 Dec 29;3(2):133-136.
doi: 10.1016/j.hrcr.2016.10.006. eCollection 2017 Feb.

Ventricular tachycardia slower than the rate cut-off of a subcutaneous cardiac defibrillator sensed and successfully treated as a result of oversensing

Ali A Sovari  1 , Ashkan Ehdaie  1 , Qiang Liu  1   2 , Xunzhang Wang  1 , Charles Swerdlow  1 , Michael Shehata  1
Affiliations
Case Reports

Ventricular tachycardia slower than the rate cut-off of a subcutaneous cardiac defibrillator sensed and successfully treated as a result of oversensing

Ali A Sovari et al. HeartRhythm Case Rep. .
No abstract available

Keywords: Defibrillation; Inappropriate shock; Oversensing; S-ICD; Subcutaneous defibrillator; Ventricular tachycardia.

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Figures

Figure 1
Figure 1
A: Twelve-lead electrocardiogram during sinus rhythm. Screening surface electrograms in lead II (secondary vector) during sinus rhythm at prescreening in B: supine and C: standing positions.
Figure 2
Figure 2
Twelve-lead electrocardiogram of the ventricular tachycardia (VT) episode. A: The absolute amplitude of the QRS in lead II is 2.3 mV. B: The subcutaneous implantable cardioverter-defibrillator’s stored subcutaneous electrogram of the VT episode in which T- and P-wave oversensing resulted in delivering inappropriate shock. The shock terminates the VT after a few beats and sinus rhythm with similar rate to the VT rate initiates. Note R-wave amplitude is low in VT (0.4–0.8 mV) and much larger in sinus rhythm after the shock (beginning at 61 sec, 2.5–3 mV).
Figure 3
Figure 3
Posteroanterior (PA) and lateral chest radiographs at presentation with ventricular tachycardia were unchanged compared with radiographs at implantation.
See this image and copyright information in PMC

References

    1. Rowley C.P., Gold M.R. Subcutaneous Implantable Cardioverter Defibrillator. Circ Arrhythm Electrophysiol. 2012;5:587–593. - PubMed
    1. Weiss R., Knight B.P., Gold M.R. Safety and efficacy of a totally subcutaneous implantable-cardioverter defibrillator. Circulation. 2013;128:944–953. - PubMed
    1. Wilson D., Yue A., Roberts P.R., Morgan J.M. Oversensing and shock delivery in the S-ICD: five shocks two mechanisms. Pacing Clin Electrophysiol. 2015;38:1009–1013. - PubMed

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