The default defibrillation technique is now to use a single shock technique rather than a salvo of up to three shocks. The main rationale for this approach is to minimise the interruptions to CPR, which have been shown to be associated with a rapidly decreasing diastolic blood pressure (and coronary perfusion pressure) and a decreased likelihood of successful defibrillation. The shock success for currently used defibrillators is actually very high for the initial shock, and the interruptions to CPR for the second and third shocks in succession are thought in most circumstances to be more detrimental than the incremental success from these subsequent shocks.

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