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That's the good news, Neil. It isn't possible for your heart to overfill. It just can't. There's finite space in the atria and ventricles, and when they're full, they're full. Plus, if you've seen the musculature in the cross section of a heart, you'll see there's no way that small amount of blood will overwhelm the massive amount of muscle tissue.
I'm thinking either esophageal spasm or possibly cardiac spasm, though that seems way less likely.
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