For heart valve replacements, there are generally 3 ways to go:
- Artificial valve (no rejection due to foreign tissue, but can wear out)
- Valve from a cadaver's heart (won't wear out, but like any transplant needs lifetime immunosuppressive drugs to avoid rejection)
- Valve from an animal's heart (for some reason, less likely to be rejected than one from a cadaver)
Don't know why they'd use one from a cow's heart - from what I've heard, pig valves are more commonly used due to a pig's heart being closer in size to a human heart.
- Artificial valve (no rejection due to foreign tissue, but can wear out)
- Valve from a cadaver's heart (won't wear out, but like any transplant needs lifetime immunosuppressive drugs to avoid rejection)
- Valve from an animal's heart (for some reason, less likely to be rejected than one from a cadaver)
Don't know why they'd use one from a cow's heart - from what I've heard, pig valves are more commonly used due to a pig's heart being closer in size to a human heart.

I AM the evil bastard!
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