The ruling on performing dangerous medical operations when there is a possibility of death

Question:
He says: Honorable Shaykh, may Allah grant you success. He says: A man was afflicted with a heart disease, and his heart became very slow. The doctor offered to perform a dangerous operation and said, "If it succeeds, your health will return, with Allah's permission, but the operation is not one hundred percent successful; you might die." His question is that his family is currently refusing this operation, and he asks: What is your advice for this man? Should he remain in his current state and illness until Allah takes his soul, or should he undergo this?

Answer:
The default is that medicine is permissible; seeking treatment is permissible. So as long as he has a cure and medicine, it is permissible for him to seek treatment, and praise be to Allah.