Man implanted with a single-chamber defibrillator (Visia AF XT VR) for ischaemic cardiomyopathy.
The graph shows a sudden acceleration of the ventricular rhythm with rapid cycles detected in the VF zone; a burst and then a shock are delivered; the first shock seems ineffective with persistence of the arrhythmia which is reduced in a second phase; a second electric shock is delivered just as the frequency seems to have normalised.
The tracing shows a rapid, monomorphic ventricular arrhythmia detected in the VF zone.
This is a burst before the charge.
This is a burst during the charge, the first burst having been ineffective.
This is a maximum electric shock delivered when the 2 bursts have proved ineffective.
The shock was ineffective and a monomorphic ventricular arrhythmia persisted; the redetection counter was completed (12/16).
The ventricular arrhythmia has spontaneously reduced during charging; once the re-detection counter has been completed, therapy (second shock) cannot be abandoned; at the end of charging, the device synchronises with the first ventricle detected and the shock is delivered.
