I have heard it explained like this also. But it can't literally "explode". The vessels can burst and even rip. I was watching a show recently when Hank Williams' young death was quoted as being caused because his heart "exploded". He had sudden cardiac arrest. His heart didn't explode, though.
I was in the hospital after a tripple bypass I contracted staff and was in ICU after debreeding and I heard the nurse scream "Oh my god". I felt war liquid in my face. she jumped o top of me and stuck her thumb in to the hole in my heart. I was rolled back into surgery and my heart was stiched up. What is that called.
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