Nephrology Flashcards
(150 cards)
what are three signs that renal failure is chronic?
- kidneys smaller
- hematocrit drops (due to decreases erythropoietin production)
- calcium level drops (due to loss of vitamin D hydroxylation)
what are possible causes of pre-renal azotemia (pre-renal renal failure)? (6)
- hypotension (SBP
What are the diagnostic tests and associated findings associated with pre-renal azotemia (pre-renal renal failure)?
- BUN to creatinine rate > 15:1 (bc urea reabsorbed due to ADH; usualy > 20:1)
- low urinary sodium ( 500
What are the three diagnostic tests that should always be performed if it is a renal case?
- urinalysis
- chemistries
- renal ultrasound
What are four possible causes of post-renal azotemia (obstructive uropathy)?
- stone in bladder or stone in ureters (bilaterally)
- strictures
- cancer of bladder/ prostate/ cervix
- neurogenic bladder (occurs in diabetes and multiple sclerosis)
What are lab and physical exams findings associated with post-renal azotemia (obstructive uropathy)? (4)
- elevated BUN to creatinine ratio (>15:1)
- distended bladder on exam
- large volume diuresis (after catheterization)
- bilateral hydronephrosis on ultrasound
What the diagnostic test findings that are suggestive of intrarenal type renal failure? (3)
- BUN to creatinine ratio of 10:1
- urinary sodium > 40
- urine osmolality
…. is an intrarenal cause of renal failure that can be caused by either …. or …. resulting in death of tubular cells
Acute tubular necrosis (ATN); hypoperfusion; toxins
What are four common causes of toxin-induced renal insufficiency?
- aminoglycosides (associated w/ hypomagnesemia; genatmicin, tobramycin)
- amphotericin
- contrast agents (urine sodium low
What is the urinalaysis finding associated with acute tubular necrosis?
muddy brown/ granular casts
A pt presents with elevated BUN and creatinine along with a new rash and fever after starting treatment with penicillin/sulfa drug/ quinolone/ rifampin/ allopurinol/ phenytoin/ cyclosporine/ quindine most likely suffers from…
allergic interstitial nephritis
hypersensitivity reaction to meds
What is the best initial test and its associated finding for allergic interstitial nephritis?
urinalaysis showing white cells
What is the most accurate test for allergic interstitial nephritis?
Wright stain or Hansel’s stain of urine showing eosinophils
A pt presents with elevated BUN, creatinine, and CPK after a crush injury/ seizure/ cocaine use/ prolonged immobility/ hypokalemia/ recently starting a statin for hyperlipidemia most likely suffers from ….
Rhabdomyolysis
large volume muscular necrosis releases myoglobin which is directly toxic to kidney tubule
What is the best initial test for rhabdomyolysis and its associated finding?
urinalaysis showing large amounts of blood with no cells
What is the most accurate test for rhabdomyolysis?
urine myoglobin
What diagnostic test should be ordered if rhabdomyolysis is suspected?
- urinalaysis
- CPK (elevated)
- potassium (hyperkalemia due to K release on cell lysis)
- calcium (hypocalcemia bc damaged muscle binds Ca)
- chemistries (decreased serum bicarbonate)
What is the best treatment for rhabdomyolysis? (3)
- bolus of normal saline
- mannitol and diuresis (decreases myoglobin contact time with tubule)
- alkalinization of urine (decrease myoglobin precipitation at tubule)
What is the most urgent step in the management of a pt with rhabdomyolysis?
obtain EKG (to assess for signs of hyperkalemia with peaked T waves –> death)
What is the treatment for hyperkalemia leading to EKG changes (peaked T waves)? (3)
- calcium gluconate
- insulin
- glucose
A pt presents appearing intoxicated with metabolic acidosis, elevated anion gap, and elevated BUN and creatinine most likely suffers from ….
Oxalate crystal induced renal failure
secondary to antifreeze/ ethylene glycol ingestion
What is the best initial test for oxalate crystal induced renal failure?
urinalalysis showing enveloped shaped oxalate crystals
What is the best initial treatment for oxalate crystal induced renal failure?
ethanol/ fomepizole with immediate dialysis
A pt presents with elevated BUN and creatinine following chemotherapy for lymphoma/ disseminated cancer most likely suffers from …
Uric acid crystal induced renal failure secondary to tumor lysis syndrome