I am so sorry for your situation. Just reading your letter brought back old feelings of frustration that occurred years ago while training in a chronic facility. Please understand that this type of "teammate" struggle occurs in many occupations with nurses, ie. flight nurses; paramadic vs. RN, CCT nurse; paramedic vs. RN, LVN's vs RN's. It's truly very sad and oh my gosh, so very frustrating!
It's all about ego trips and shoulder chips. Also, I'd bet big bucks that your FA isn't an RN. If your FA was truly an RN (or maybe a good FA) that was trained in dialysis, she/he would have never made this an issue with you because more than likely it would have been something that he/she had experienced throughout their personal dialysis years. Also, if your FA had participated in any of your training (ie. weekly evals) and would have actually taken just a touch of participation in your training, the FA would have been able to see for his/herself that nasty RN additude you were carrying.

However, telling you this isn't going to make your situation any easier. Please just remember your years of RN education and be proud of your title and of who you are. There was another nurse that responded telling you to basically not let them bring you down because that is what they're trying to do. They're trying to just put you in your place before you ever even get out the gate. They're trying to show who's the boss.
I've had techs override UF and sodium modeling orders just because they could!???? Setting an SV as high as 150. Then they wonder why the pt. comes back hypervolemic? Do they understand that they were the ones that sent that pt. home thirsty? Exactly how much do techs understand labs and the effects of their highs and lows? What do they understand about the underlying diseases these pts. also have? What do they know and understand about CHF, cardiomegaly, cardiomyopathy, diabetes, etc. and how these diseases can behave during txs.? They know they have to remove fluid and keep those vitals stable. Techs and nurses both can become very number focused and task oriented. Dialysis is very individualized. Believe me, their are some very intelligent dialysis technicians out there that really know their stuff. The techs that do, though, have total and complete respect for an RN's training and their knowledge base. Also, it takes at least a good 3 years of hard chronic time under your belt to be able to pat yourself on the back and to be able to say that you know that you know what you know!!!

If a tech wants to rule the roost, then they need to go to school, pay thousands of dollars out of their pocket or in school loans, give up how many years of their lives to be able to take the state boards and obtain their nursing degree.
Keep your head up high, a smile on your face and take no abuse!!!! This behavior is based hugely on ignorance. They have no idea what your responsibilities involve.
When you get really good at your job, move into acutes and then you can really shine. Then you can really save lives!! It's an awesome feeling

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Good luck in your challenges and be strong! Remember you gave up many years to become a professional and that's what you are. Remain just that!!!