You may want to speak with the Md about making some changes in heprinaztion, Also the age of the access may mean that it could be stenoising. The may need a angiogram.
I would have acted in the same way. No BP is no life. Treat the cause for now. We use critlines in instances like this along with dopamine and albumine. Also some times people who are septic get this way or the ones who have fluid in the pericardie...