Acute kidney injury question

[Antel0pe]

Does anyone know anything about the RIFLE or AKIN classification for AKI? I'm just wondering because the urinary category is <0.5ml/kg/hr in 6hrs (stage 1), <0.5ml/kg/hr in 12hrs (stage 2), <0.3ml/kg/hr in 24 hrs (or anuria 12 hrs, stage 3). So what does that actually mean? If a 100kg patient urinates 400mls at 10 hours, what category would he fall under? Do you just consider stage 2 (<0.5ml/kg/hr) since he is at 10 hours? What if he urinated 1,200mls at 24 hours, do you just consider stage 3 since this is at 24 hours?

Here are the classifications: RIFLE and AKIN classifications for acute kidney injury: a critical and comprehensive review

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[thegreatandmythical227]

Well the urinary coefficent is the product of the reciprocal of the flow rate. So if you can find that, you should be able to scale them up

 

[MaxPlancker]

400ml in 10 hours = 40ml/hr; 100kg patient so 40ml/hr / 100kg = .4ml/kg/hr for 10 hours which puts him at between stage 1 and 2; not that this clinically matters much, just give him a bolus of NS or LR

I think more practically you just want to note whether he is urinating at least .5ml/kg/hr, if not then patient needs fluids and likely has AKI or some other kidney problem.