Sure. The original source is the writings of Usamah Ibn Mundiq, who was sent among the occupiers to determine if there could be any alliance. He wrote his observations about many aspects of Crusader society, including their so-called medicine.

In the cases you reference, both the knight and the woman died. Usamah, who was observing all this in horror, finishes his tale thus: "I then asked 'Have you any further need of me?' They said no, and I returned home, having learned much that I had never known about the medicine of the Franj."

My source on this is The Crusades through Arab eyes by Amin Maalouf, which I recommend to anyone interested in this period.