Pikuach nefesh for a non-Jew
Is a Jew permitted to break Shabbat (pikuach nefesh) for a non Jew? Specifically:
1. A non-Jew is having a heart attack and needs help – his neighbours are not in the vacinity
2. I have looked in the kitzur shulchan aruch and the shulchan aruch but have not found an answer – perhaps I looked in the wrong place.Please give me chapter and verse
3. Is the answer min HaTorah or min Rabbanan?