One of the physicians in the holy city of Qom narrates: When we heard that Imam was suffering with a heart problem, I myself went to his bedside and measured his blood pressure.
The Imam's blood pressure was very low and from a medical viewpoint was very critical. I quickly gave the Imam emergency treatment. After two hours, his condition had improved slightly but remained critical. At that time, I saw that Imam had gotten up from his place.
I asked the Imam why he had gotten up. He replied that it was for prayers. I said to him, “In the field of Islamic jurrisprudence, you are a Mujtahid. However, in the medical field, I am a specialist. In my opinion, moving about for you is haraam. It is better that you pray lying down." Imam quickly heeded my words.
(A memoir by Mrs Fatema Tabatabai – Imam's daughter-in-law)