Man implanted with a single-chamber defibrillator (Visia AF XT VR) for dilated cardiomyopathy.
1, 2. What diagnosis do you suggest from this graph?
This episode was classified as TVR (1); the graph shows a sudden acceleration with cycles detected mainly in the TVR zone; detection of a TVR episode effectively treated by a burst.
3. What is your diagnosis?
The EGM shows a regular, monomorphic tachycardia, detected in the TVR zone; the TF. marker indicates that the defibrillator is programmed with a TVR zone via FV.
4. What therapy is delivered?
The VF counter was filled with 30 cycles out of 40 classified as TF; analysis of the 8 cycles preceding the diagnosis found only TF cycles with no FS cycle leading to the diagnosis of TVR; the first therapy in the TVR zone, a burst, was delivered; reduction of the arrhythmia.
5. How many zones are programmed?
The way in which the zones are programmed can be difficult to understand; you might think that the FV zone starts at 188 bpm and stops at 222 bpm, with the TVR zone starting at 222 bpm; in fact the opposite is true: TVR from 188 to 222 bpm and FV above 222 bpm; the TVR zone is programmed via FV; this reflects the fact that the same FV meter is used from 188 bpm.
5- Combien de zones sont programmées ?
La façon dont est présentée la programmation des zones peut être difficile à comprendre ; on pourrait effectivement penser que la zone de FV commence à 188 bpm pour s’arrêter à 222 bpm, la zone de TVR débutant à 222 bpm ; il s’agit en fait de l’inverse : TVR de 188 à 222 bpm et FV au-dessus de 222 bpm ; la programmation de la zone de TVR est via FV ; cela traduit le fait que le même compteur de FV est utilisé à partir de 188 bpm.
