I love flash fiction challenges, but they are exactly that; challenging. You went an interesting way with your prompt, however, and delivered a self-contained story (with an opening for much more at the end) in a very restricted space. Well done.

A little nit-picky stuff. There was some tense confusion in the 3rd paragraph, where the doctor's actions were described in the present and most of the narrative is in the past. Even more nit-picky: I think you may have neglected a few spaces between paragraphs, which would improve readability.

The setting was well established and the conflict was present and understated. Was it resolved? Not really, although the stakes of conflict are clearly defined. The characters, their actions and dialogue are accessible and believable. Overall a good read. Good job!