On the basis of this Gemara, the Steipler is quoted as having said that once doctors have determined that by the laws of nature, בדרך הטבע, the patient cannot live, then it is wrong- assur- to daven that he recover.
I also saw an article quoting a highly regarded Rosh Yeshiva in Otniel to the same effect- considering the similarity in expression, I assume he was thinking of what the Steipler said:
Other mekoros that I'll discuss if I have a chance: רמ"א , בכור שור, ישועות יעקב, נפש חיה in OC 187:4 and 682:4 from the Kolbo, Mahrsh"a in Kiddushin 29b, נפש החיים ג' י"ב, רוח חיים ב' ד, רבנו בחיי, and others, all of whom say things that are worth hearing.
But several articles that I recently read motivated me to post this before I was ready to discuss the mekoros in the Gemara, Rishonim, and Achronim.
Later, this one joined the ranks.
Possibility Two: Misdiagnosis due to incompetence or negligence.