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Ventricular tachycardia initiated by high energy cardioversion in a patient with an implantable cardioverter defibrillator.
  1. M. Chinushi,
  2. Y. Aizawa,
  3. K. Higuchi
  1. First Department of Internal Medicine, Niigata University School of Medicine, Japan.


    A transvenous implantable cardioverter defibrillator (ICD) was implanted into a 58 year old woman with idiopathic dilated cardiomyopathy who had drug refractory monomorphic ventricular tachycardia (VT). Antitachycardia pacing failed to terminate the VT; termination was attempted at 24 J, which was above the defibrillation threshold. When cardioversion at 24 J was delivered, VT with a different morphology and slower rate was reproducibly initiated. At 3 J, however, the original VT was successfully terminated without initiation of the slower VT. A new VT may be induced by high energy cardioversion. This may be a manifestation of the proarrhythmic potential of ICDs.

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