Effect of sensing system on the incidence of myopotential oversensing during bradycardia pacing in implantable cardioverter-defibrillators

We compared the incidence of oversensing of myopotentials during bradycardi a pacing in implantable cardioverter-defibrillators from 3 different manufa cturers, with 3 different types of sensing systems. The Ventritex sensing s ystem, which uses maximum gain continuously during bradycardia pacing, had a higher incidence of oversensing (24% of patients) than the sensing system s of CPI (3%) or Medtronic (0%), suggesting that the Ventritex sensing syst em may be unsuitable for use in a dual-chamber defibrillator.