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Table 1 Type, description and total number of ICD errors caused by the secondary neutron from 107 Gy proton beam irradiation for each of four ICDs (Marquis DR 7274, Medtronic, Minneapolis, MN)

From: Influence of secondary neutrons induced by proton radiotherapy for cancer patients with implantable cardioverter defibrillators

Type of error Explanation Change in frequency and pulse width Alarm is sounded ICD reprogramming Number of sessions detected by the programmer Number of errors revealed by analysis of the ICD data logs
Hard error The ICDs stop generating pulses permanently. Yes No Impossible 0 0
Soft error      13 29
   Power-on reset The ICDs present sudden complete failure and switch over to the safety backup mode. Yes Yes Necessary 8 8
   Partial electrical reset The ICDs show no change in mode of pacing. No Yes Unnecessary 5 7
   Minor error The ICDs show no change in mode of pacing. No No Unnecessary 0 14
  1. Abbreviation: ICD = implantable cardioverter defibrillator