#46 Try using this design but add a silhouette of say a doctor helping a patient. Also try #46 with a heartbeat line like #48.. #48 i pefer the layout and fonts better in your other submissions.
#50 I like this alot but I can't have "blank" areas like you have with the doctor's lower body running out in to nowhere.. So try completing the heart logo, or completing their bodies more. Also try just one color and grey or black. Try a blue version and a red version.