The Ruling on Replacing a Human Heart with Another Heart

Question:
Does the heart change if it is removed, for example, through a surgical operation and replaced with another heart in cases of heart diseases that result in a heart operation?

Answer:
Regarding the heart operation, historically, we have not known of any continuous success; rather, we have only heard of temporary success in limited periods for treatment.
As for if the heart succeeds, its ruling is the ruling of the original heart. If it succeeds, stabilizes, and one uses it to reason and understand, then this heart that was replaced for the first heart, and in which its characteristics were placed, and to which the arteries and things that supplied the previous heart are connected, its ruling is the ruling of the previous heart. As long as one reasons with it and understands with it, its ruling is the ruling of the previous intellect and the previous heart, and one becomes accountable for everything.
As for if his intellect is lost, then his accountability is lifted. However, in what we have heard now, the treatment related to the heart, all of it, has not achieved complete success; rather, it is a temporary success for limited periods.