PMC2771149_01
CT topogram. Initial topogram of the scan, showing the implanted device in the left pectoral zone and both electrodes. Arrows: date and time of scan.
CRM2009-189429.001.jpg
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fig1
The study began at 19 : 25 and ended at 19 : 34; it yielded 36 images in 6 series together with the initial topogram (Figure 1).
Therapy history: episode 460. Detection of ventricular fibrillation on November 5, 2008 at 19 : 32, coincident with the CT scan exam. Diverted therapy due to reconfirmation analysis.
CRM2009-189429.002.jpg
PMC2771149_01_CRM2009-189429.002.jpg
fig2
Electrograms of episode 460. Oversensing due to artifacts that start capacitors charge and provoke ventricular pacing inhibition.
CRM2009-189429.003.jpg
PMC2771149_01_CRM2009-189429.003.jpg
fig3
The oversensing provokes the charge of the capacitors and at the same time causes significant pauses due to inhibition of ventricular pacing (Figure 3).