One has stood out.
Medibabble is a real-time medical translation app and is now available for FREE. It was created by two innovative UCSF medical school graduates, Dr. Alex Blau and Dr. Brad Cohn. This app contains an extensive preset list of history questions and physical exam commands. When you click on a sentence, the app will translate and speak the sentence in one of 5 languages (Spanish, Cantonese, Mandarin, Russian, and Haitian Creole).
Download MediBabble (takes you to iTunes link)