I would suggest that you think about what practices, procedures or interventions most interest you - maybe that surprised you when you first learned about or saw them, that you had a strong reaction to, that made you question the underlying principle etc. Researching something that you don't have a connection with is the most boring thing you can do!
For example, several years ago I read an article by Peter Singer, a philosopher with an interest in medical ethics. He was writing about ICU nurses and brain death, and from the observation that they spoke to the brain dead, concluded that they didn't understand the concept of brain death. I talk to dead patients as I lay them out, and I absolutely know they're dead (!) so my immediate reaction was "that's not right!"
Now I'm interviewing ICU nurses who speak to their brain dead patients about the reasons why they do it. It's something I've thought about for a while and am really interested in.
A friend of mine was uninspired about a research topic and ended up writing a thesis on how the local nurses' board came up with their code of ethics. By the end of it she was heartily sick of the whole thing, and it was a real effort for her to even finish it off.
Hope this helps, even though it's not a list of possible areas of research
edited for typo