(FIT)-Module 5 Workshop 8: Device Cases-Poole Case 9 Answer

Video Transcription

Video Summary

The correct answer to whether a 25-joule shock can reliably defibrillate ventricular fibrillation (VF) is "C" — it is not likely to. The transcript explains that defibrillation strength and vulnerabilities must be understood in context with the ICD's (implantable cardioverter-defibrillator) algorithms and upper limits of ventricular vulnerability. An ICD shock is synchronized to the R-wave to avoid inducing VF, with confirmation algorithms ensuring appropriate shock delivery. A shock below a certain threshold may induce VF during the vulnerable period rather than defibrillating it, as determined by the upper limit of vulnerability testing, thus 25 joules may be insufficient.

Keywords

ventricular fibrillation

defibrillation

implantable cardioverter-defibrillator

shock energy threshold

upper limit of vulnerability