The daughter of an 84-year-old female client in the emergency department (ed) told the ed nurse that her mom has not been herself for the past 2 days, stating that "she seems to be more confused these days and her appetite continues to decrease , and refusing to even drink her ensure "initial vital signs are t. 99, hr 112, bp 133/78 rr 24, sa02 91% on room are. what possible medical problem should the nurse anticipate for this patient ?