Quote from cpr,sucka
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It is not compressions that "resets" the heart. In a normal heart, the heart rate is controlled by one of the heart's pacemakers (there's backups). The normal conduction of the heart begins in the sinoatrial node, and conducts along the normal pathways in an organized fashion. When the heart is fibrillating, the heart muscle is firing in unorganized fashion. Defibrillation basically causes all heart muscle to depolarize at the same time. Basically, it's enough energy that it causes all muscle to cease contraction for a brief amount of time and allows the sinoatrial node to take over again.
The purpose of compressions is to circulate blood. While not at a full concentration during an arrest, blood carries at least some oxygen to the vital organs. However, a patient who is fibrillating needs defibrillated ASAP. Those compressions work on getting blood and oxygen to vital organs while the defibrillator is obtained, turned on, connected, and then it can analyze the rhythm. Why compressions are started immediately after delivery of a shock without a pulse check is to get that blood flowing again without wasting time- the defibrillation may not have worked, the heart may not beat at a pace high enough to provide enough circulation, or the rhythm may have deteriorated further into a non-shockable rhythm.