Given this, it's impossible to say that the doctor didn't consider the preoperative factors of the patient's own physical needs.
The first time the doctor used a mechanical valve for this patient, there was only one reason left: no other choice.
Biological valves are more expensive, and while the patient could afford it, unfortunately, the patient's body might not accept it. It's like buying an expensive piece of clothing; if it doesn't fit, it doesn't fit, no matter how expensive it is. Once again, it shows that illness does not differentiate between the rich and the poor.
