My elderly mother is in the ICU in critical condition, and she is not conscious, is there still a mitzvah of kibud em even though she is unaware and cannot ask for anything or tell me to do something, etc?
Yes. the halachos of kibbud av v’em, apply not only when a parent is unconscious, but even after they depart this world. The idea of kibbud av v’em is not merely so that the parent is honored, rather it is also in order for the child to show honor to the parent. The Gemora, (Kiddushin 30) says that there are three partners (who contributed to the creation) to a person, hashem, the person’s father and mother. If the person honors his parents it is as if he honored Hashem. The reason for this is, because when a person honors his parent he is showing that he appreciates the gift his parents and Hashem have given him… the merit to live and be alive.