If an electrode falls off, the leads that rely on it will flatline. You can tell that this is not a real arrest / asystolic ‘flatline’ by looking across the rest of the 12 lead ECG and seeing if there are some leads that are unaffected. If a chest electrode (e.g. V1-V6) falls off, only the one lead will be affected. If a limb electrode (e.g. RA, LA, RL, LL) falls off, many leads will be affected.See also: Electrode misplacement
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