According to http://www.hospicepatients.org/hospic60.html it drops dramatically and often within the last 3 days of life.

I know that you are struggling with the uncertainty of your loved one's progression - that was certainly the hardest part of my caretaking experience. Doctors, nurses and other professionals are always so reluctant to predict a timeline for so many reasons. My best friend, Art, died this past Monday, and his blood pressure was very low for at least a year - somewhere around 70/50. Two or three weeks ago it dropped to 50/30. He was only taking morphine (extended release and immediate release morphine liquid) and 100mg fentanyl patch every three days. He started taking Decadron for bone pain which also helped get his blood pressure back up to 80/50 for a couple of weeks but it sank back to 50/30. If I can offer any comfort, I've learned that the body actively dies - it shuts down slowly and fairly peacefully - but on its own timeline. From what I've experienced recently, your loved one may have an upswing as the body conserves its resources for the organs that need the most. Art really came back for a couple of weeks, and we treasured those moments. Know that you are not in control and find as much peace in that as you can. Bless you and your loved one at this very difficult time.

Thank you Nancy.

Marisa, I am so sorry for your loss. I can only imagine what you have been through. I know it must be difficult. You are an amazing person to do all you did for Art. My prayers are with you all. Thank you for your information. It is definately a struggle. We will take one day at a time although it is hard.