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The most painless and save method would be a mask or gas chamber with pure nitrogen atmosphere.

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Perhaps that’s from the trauma of the gun shot.

Look at a video of the transport or removal of a human heart for a heart transplant. It is beating without any nerve input.

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what do you think controls the AV node, the SA node, and the Bundle of hiss?? the heart controls itself, or its impulses come from the ANS, which is a sub branch of the CNS, which is the brain and the spinal cord.

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if you put a bullet through the medulla oblongata/brain stem, the heart stops, this is simple stuff, does it happen immediately, no, as electrical impulses are still working, but your concept that the heart controls itself is so basic and unfounded, I am amazed you made it through high school biology

Okay, I will be sure to reach out to my medical school and let them know that modern medicine completely misunderstands the function of cardiac pacemaker cells and the sinoatrial node. They should also check on all the people walking with dysautonomia. I'm sure they will be surprised that their hearts actually haven't been beating this whole time.

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The heart has “pacemaker cells” that make it beat/contract without any nerve input. Look up pacemaker cells.

The ANS speeds up or slows down the heart rate.