Ok so I was taking care of this pt, without giving too much info, his systolic pressures at night usually are 90-100 systolic maybe once or twice he'll drop to systolic of 80s (which I watched but dont like), but his MAP stays above 60s. I was off a few days and started taking care of him again and the nurse told me that his systolics has been 70-80 with MAPs consistently in the 50s. When asked what the MD order she stated, that they were aware and didnt want to do anything. The MD was on the unit so I trended the bp for her to see and she said, not to page her unless it "stays below a MAP of 50 for a while." At one point systolic even in the 60s at times, she said its fine. I didnt feel comfortable with this, MAPs of 60 ok I can deal with this but less than 50?????? and what is for a while? Anyone know of research that support of MAPs less than 50???? What are your thoughts on this?