I guess that you do not have any brother or sister staying near your parents in China. Even you do, it would be still tough to get the hospital in the cold night with two old elderlys. You can ask help from your good friends in advance in China for this kind of situation. You may also hire a helper in hospital. Down the end, offering financial help is the best thing you can do if you are capable. Considering you are still building your career, this should keep you more focus and motivated. Once you reach your goal, you surely can help your parents better.