Boston scientific received information that the patient implanted with this subcutaneous implantable cardioverter defibrillator (s-icd) was in ventricular tachycardia (vt).An appropriate shock was delivered which successfully converted the rhythm, however the patient went back into a vt.A second shock was delivered which accelerated the rhythm into ventricular fibrillation (vf) with a third shock successfully converted the vf.High shock impedance measurements were noted but remained within range.An x-ray was performed and the system position looked appropriate.The device was later explanted and replaced with a transvenous implantable cardioverter defibrillator (icd).No adverse patient effects were reported.
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