Do you find yourself getting frustrated or trying to figure out how to communicate with your loved one with dementia?  People with dementia are also struggling to communicate and may be frustrated as well.  For caregivers, we have to remember our loved one's brain is no longer what is used to be.  It's smaller due to shrinkage, and cells are being destroyed by the disease.  Overall, humans communicate only 10% verbally.  So imagine trying to communicate with someone who's verbal communication skills are less than 10%.  That can be a tough feat!  This frustration of trying to communicate could be anxiety producing for both the senior and the caregiver.  
Staying calm is important.  90% of the way we communicate is nonverbal.  Keep in mind that people with dementia will better understand you when you communicate nonverbally e.g. gestures, showing them what you want to do, facial expressions, gentle touch, etc.  Because people with dementia rely on emotions and feelings, they will respond to your emotions.  So if you are rushed or anxious, they will pick up on that emotion and will respond by being anxious themselves.
Try to identify what is causing their anxiety.  Are they tired?  Are they hungry/thirsty?  Are they uncomfortable?  Do they have to use the restroom?  A lot of times, it is trial and error for caregivers in trying to communicate with their loved ones.  But, keep up the good work!  Your loved ones appreciate your calm and loving nature!