Is it permissible to take a loan from Nasser Social Bank, guaranteed by the father’s pension, to install a heart stent for the mother, knowing that doctors have advised against delay?

Borrowing with interest is one of the major sins and one of the seven destructive sins. It is not permissible except in cases of extreme necessity, such as fear of perishing. If not performing the surgery will lead to the mother's demise, and there is no permissible way to cover the costs, then borrowing with interest becomes permissible.