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on the flip side - the low pressures will kill the patients now... so if put in a corner i would probably follow the egdt protocol, maximize cvp and initiate dopamine (over preference to norad) in this patient, see if it helps. I did not find major contraindics to dopa in venous ulcers.
Finally if there is no resort an amputation may need to be done, under a leg block, considering that the blood pressure is too low for safe anesthesia, and then you could eventually initiate norad too...