When these are strung together it is called vt. The same thing can happen in the atrium. The icd sees the rate of the rhythm and if it is programmed to a rate that it classifies as vt, it will start pacing at a rate just slight faster than the vt for a few beats and them stop. This doesn mean it won't start again the same with the vt. But it is a preferred way of treating slow vt rather than a shock.
All patients are so different.
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