what are you asking, exactly. without out knowing the intimate details of your grandfathers case it is impossible to know what to say or how to advise you. we cannot offer medical advice as per the terms of service
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i noticed that you have worked hospice on occasion with a prn basis...maybe you could advise your family. as an experienced nurse you know there is no real set time table for a patients deterioration or death. with 3 liters of fluid in the abdomen it sounds like there is something occult going on the you are unaware of....the presence or absence of the o2 will not postpone nor hasten your fil's demise, but can be viewed as a comfort care measure to ease their distress.
my experience with family personally has been they will hear what they wish to hear and accept what they want. nothing more, nothing less. i will always give accurate medical information and leave it on the table so i don't hear "why didn't you tell us" later. i did however put my foot down firmly when my grandmother, at age 93 (after ovarian cancer, uterine cancer, a stroke, a fracture hip, pna etc) had an odontoid fracture that was unstable and my aunt wanted her to have surgery. so we did bring her home.
i would address the nurses misinformation with the hospice provider. i don't think sips of "gatorade"tm will over all assist/prevent any progression of his condition but if it comforts him. the decision for fluids or no fluids are best handled by the provider and the family, hcp, or poa.
i am sorry your family is going through this and my prayers for you and your family.