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because there is av node in the heart that blocks most of the impulse from atria to ventricles.as for eg if there is 300 beats in atria then its blocks and it slow down the impulse so that there will be around 200 beats to ventricles.

during ventricular fibrillation there is not any such devices so it directly affects the system as a result bp increases etc that may lead to death.

Sanzay Maharzzan lzmc

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Q: Why atrial flutter not dangerous than ventricular fibrillation?
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