exam 2 Flashcards
urine specific gravity of 1.008-1.012
isosthenuric
dilute urine, USG < 1.007 (active process)
hyposthenuric
markedly decreased urine production
oliguria
no urine produced
anuria
straining to urinate
stranguria
increased frequency of urination
Pollakiuria
increased urea nitrogen with/without increased creatinine
azotemia
excessive urea in blood with clinical signs of renal failure
uremia
two hormones produced by the kidneys
EPO
RENIN
how is urea measured
BUN
where is blood urea nitrogen synthesized
liver
T/F
high protein diets will give a low BUN
FALSE
– urea is made from the amine groups of proteins
T/F
BUN can indicate the GFR
TRUE
what percent of urea is excreted by the kidneys
40%
what will happen to BUN levels if there is an upper GI bleed
they will be higher because urea is made from proteins and blood has proteins
T/F
an increased GFR will increase the BUN
FALSE
a decreased GFR will increase BUN because the urea has to wait for entry into the kidney and gets backed up into the blood
patients with a portosystemic shunt will have what type of BUN levels
low – because amino acid proteins are not getting delivered to the liver
what are examples of intestinal loss of proteins leading to a lower BUN
- protein losing enteropathies – all protein shit out so you cant make urea
- ruminants use urea to make proteins in the microflora so levels are lower
Muscle cells release ____ into plasma
CREA
T/F
CREA is not resorbed by the kidneys
TRUE
T/F
higher muscle mass = higher crea levels
TRUE
increased blood CREA levels implies …
1) A decrease in GFR
2) Possibly altered nephron function
what percent of CREA is excreted by the kidneys
100% – great for GFR measuring
Kidney’s Ability to Concentrate and Dilute Urine requires what percent of functional nephrons
33%
T/F
The higher the urine specific gravity,
the more concentrated the urine
TRUE
urine specific gravity should always be interpreted along with what
patients hydration status
polyuria Implies loss of ___% of functional renal mass
66%
T/F
patients who have polyuria with also have polydipsia and be isosthenuric
TRUE
list 2 renal causes of polyuria
- renal failure
2. pyelonephritis
extra renal causes of polyuria
diabetes
pyometra
hyperadrenocorticism
diuresis
azotemia implies ____% loss of renal tubular function
75%
↑ BUN, +/- ↑ CREA, ↑ SpGr
PRE RENAL azotemia – before the kidneys (blood, liver, gi)
top 2 differential diagnoses for pre renal azotemia
- DEHYDRATION/shock
2. upper GI bleed
when there is a low GFR what happens to phosphorus and magnesium
they both increase
type of azotemia
↑ BUN, ↑ CREA, ↓ SpGr
renal
Defined by the presence of increased nitrogenous
waste products in blood
renal azotemia
renal azotemia differentials…
• Infectious Pyelonephritis, Leptospirosis
• Toxins Ethylene glycol, drugs, grapes, Asiatic lilies,
melamine, pigments (myoglobin, hemoglobin)
• Hypoxia Decreased renal perfusion, infarction
• Neoplasia Primary or metastatic
• Congenital Hypoplasia or aplasia
• Misc Hydronephrosis
type azotemia
↑ BUN, ↑ CREA, variable SpGr
post-renal
urine leaks into peritoneal cavity and can be a cause of post renal azotemia
uroabdomen
T/F
azotemia comes before polyuria
FALSE other way
what is happening if ca x phos > 70
mineralization of soft tissues
T/F
hypophosphatemia occurs when the GFR drops
false – excretion is impaired – hyperphos
Renal Secondary Hyperparathyroidism
Hypocalcemia stimulates the parathyroid glands to
release parathyroid hormone (PTH)
PTH stimulates an increase of Ca mostly from bone resorption
what to look for in Glomerulonephropathy
hypoalbuminemia
hypercoagulable
proteinuria
pathogenesis of Glomerulonephropathy
Damage to the podocytes
- Antigen-antibody complex deposition
- Amyloid deposition
Protein-losing nephropathy that leads to
abdominal effusion
nephrotic syndrome
5 things needed in nephrotic syndrome
- Proteinuria (glomerular disease)
- Hypoalbuminemia (loss of albumin)
- Abdominal effusion (loss of oncotic pressure)
- Hypercholesterolemia
- Hypercoagulable state (loss of antithrombin)
BCS of acute renal failure patients
normally good – they just get sick super fast
also abrupt decrease in GFR
acute renal failure causes
toxicants (i.e. lily toxicity in cats)
renal ischemia
infection (i.e. leptospirosis)
typical patient of chronic renal failure
old patients, normally kitties get sick slower thin/cachexic polyuric depressed cvs: hypertension hyperkalemia!!!!
what is the common electrolyte imbalance seen with uroabdomen
hyperkalemia
hyponatremia / hypochloremia
causes of uroabdomen
Trauma: birth (foals), hit-by-car (dogs), etc.
Chronic urethral obstruction
how to diagnose peritoneal effusion
the crea in the effusion must be 2x higher than crea in the plasma
ideal collection technique for urinalysis culture
Cystocentesis
brown-black urine
Methemoglobinuria
from (from HGB or MGB), bile pigments
what does the urinalysis dipstick measure
Glucose, Bilirubin, Ketones, Heme, pH, Protein
Hyperglycemic glucosuria differentials
Diabetes mellitus
Acute pancreatitis
Stress (especially in cats)
Glucose-containing fluids
Conjugated with glucuronide in the liver
bilirubin
T/F
Low-level bilirubinuria with hypersthenuria is considered normal in dogs.
TRUE
differentials for bilirubinemia
Cholestasis, Hemolysis, Fever, Prolonged fasting (esp. horses)
hematuria differentials
Inflammation,
Infection,
Trauma,
Coagulopathy,
T/F
myoglobinuria = muscle injury
TRUE
– clear serum
urinalysis protein that is primarily detected
albumin
T/F
in hemoglobinuria the patient will also be anemic
TRUE
what species are predisposed to Calcium oxalate dihydrate (crystalluria)
Miniature Schnauzers
secreted by pancreatic b cells
insulin
insulin ____ blood glucose
decreases
glococorticoids _____ blood glucose
increase
T/F
catecholamines inhibit insulin action
TRUE
catecholamines ____ blood glucose
increase