Like I tell my students when I have them, I don't go from forward to back on my Nanda's but backwards to forwards.
I think...okay what is the probelm as I see it (and remember, just ONE probelm at a time). SO in my brain I say..hmmmm I am worried about skin, and the fact the pts buttocks are getting red.
Okay good...now were on onto something..what did I do or what do I want to do? Okay get them off the area, turn frequently, have it checked every shift, use pillows and bed position changes to float the area, and even request a air bed. Okay COOL...I have my implementations already, and I will know if they work by less redness and no breakdown...WOW, got my evaluation/goals of care!
Now I work backwards...Got my implementations and evaluation so lets fill in the gaps. This person has a red buttock area...okay that is my as evidenced by! "Presence of warm moist reddened bilateral buttock areas" COOL got my AEB! Two more steps to fill in!
Related to..hmmmm why is this happening...of course, mobility is bed bound...easy! So now one step left....hit the Nanda Dx's and find one that fits!!!!!! Impared Skin Integrity! Perfect! Now lets take all this and move it all forward....
Impared skin intergity r/t decreased mobility (bed bound), AEB moist warm reddened areas on bilateral buttocks. Implementation: turn pt q 1-2 hours, use of pillows to float the area as much as possible, monitor skin q shift and alert wound care PRN, discuss use of air mattress with the MD. Evaluation/Goals: Pt will have lessening of redness on bilateral buttocks and keep intact skin.
I find if you go backwards things seem a little to the point better then trying to fill in the gaps from front to last! Break it down...what did you see (that will typically be your first thing but will be you AEB), what do you want to do (IMplementations), how do you know it works (evaluation), Why is this happening (keep it simple...remember one probelm at a time per NANDA dx and that is you r/t), and find a NANDA dx! Then fit it all in

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I have taught this to students and had them ace care plans! Heck, I could have also gone dietary on this one, but that would be a whole new nanda care plan as it should be...only address on simple probelm at a time, and keep it simple...simple breaks things down into workable things that you actually can achieve in your evaluation/goal area!
Good luck and feel free to ask me questions on it...gotta find my old NANDA book! LOL!