This is highly dependent on the reason the heart stopped and surrounding circumstances such as whether the patient’s collapse was witnessed, the type of heart activity, whether CPR was provided immediately and others. In general, patients having what we generally term as a heart attack with sudden collapse who were otherwise in good health may be resuscitated 20% of the time. A patient who is elderly with multiple medical problems will have a successful resuscitation much less often, perhaps between 0-3%. Both these estimates vary widely depending on the facts of an individual case.
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