Implantable cardioverter-defibrillator shock: appropriate or inappropriate?
A 76-year-old female with a single chamber implantable cardioverter-defibrillator implanted for secondary prevention was referred due to multiple discharges. The device was programmed for ventricular tachycardia (VT) detection at 400 ms, fast VT detection at 280 ms, and ventricular fibrillation detection at 320 ms. Antitachycardia pacing (ATP) during charge was enabled. Interrogation revealed a VT episode with a mean cycle length of 270 ms, which was successfully terminated with ATP during charge. Seconds later, the device delivered a shock. This case illustrates the importance of understanding programming algorithms as part of troubleshooting when facing a scenario of device discharge.
Kingston General Hospital, Queen's University, Ontario, Canada.
Michael A
MA
Nault
William F
WF
McIntyre
Christopher S
CS
Simpson
Damian P
DP
Redfearn
Hoshiar
H
Abdollah
F James
FJ
Brennan
Adrian
A
Baranchuk
D000368:Aged; D000465:Algorithms; D017147:Defibrillators, Implantable; D004554:Electric Countershock; D004868:Equipment Failure; D005260:Female; D006801:Humans; D017180:Tachycardia, Ventricular / Q000628:therapy