Can death be prevented?

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Say we have a middle aged male and for some reason, his heart stops working. Lets assume by magic, we are able to remove his heart and replace it with a working one all within a matter of minutes. Would that male come back to life? Now let's take a man in his 80's, he dies from so called "natural causes". If we are able to determine why he died, replace the organ that failed with a working one all within a few minutes, would the old man come back to life? Finally, a female who died 5 days ago, she was frozen in ice so her body hasn't decayed yet. Like the middle ages male above, let's assume she died because her heart failed. Would replacing that heart 5 days later with a working one automatically result in her coming back to life? The above assumes the following: - Souls either remain in the body after death, return to the body after death or souls do not exist - We have medical advancements that allow us to grow new organs to replace old, failed organs within a few minutes