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23 Cards in this Set
- Front
- Back
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definition of acute renal failure
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increase in serum creatinine > .3 in 48 hours
increase in serum creatinine >50% in 48 hours |
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clinical signs of acute renal failure
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edema
hematuria oliguria |
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3 types of acure renal failure
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prerenal
intrinsic postrenal |
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cause of prerenal acute renal failure
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renal hypoperfusion
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cause of postrenal acute renal failure
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obstruction
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bedside workup of acute renal failure
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bladder scan (pre and post void)
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labs for acute renal failure
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specific gravity
urine osmolality casts hematuria proteinuris |
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formula for FeNa
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urine sodium x serum creatinine/
serum sodium x urine creatinine |
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FeNa and FeUr levels in prerenal ARF
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FeNa: <1%
FeUr: <35% |
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FeNa and FeUr levels in intrinsic ARF
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FeNa: >2%
FeUr: >50% |
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when is FeUr used instead of FeNa
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when patient is on diuretics
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FeNa would be ___than expected if a patient is concurrently on diuretics
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higher
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imaging study used for ARF dx
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renal ultrasound
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neurogenic bladder is a cause of what type of ARF
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postrenal
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how to dx postrenal ARF
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pre and post void (>300ccs of urine remain in bladder after void is positive)
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when is there a favorable prognosis for postrenal ARF
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when obstruction is relieved within a week
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when are patients with postrenal ARF not oliguric
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when they have neurogenic bladder
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prerenal ARF occurs with a MAP of less than what
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60
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how do ACE-I worsen renal failure
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dilate the efferent arteriole and reduce GFR
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clinical signs of prerenal ARF
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low/low normal BP
orthostatic hypo tachycardia dry mucus membranes |
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FeNa, Uosm in prerenal ARF
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FeNa will be low
Uosm will be high |
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BUN/Cr ratio in prerenal ARF
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>20:1
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what is azotemia
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increased nitrogen in the blood
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