Urinary Flashcards
Why do urinary GGT and ALP increase with AKI?
Too big to filter through glomerulus. Tubular injury –> leaking GGT and ALP.
JVIM 2021, Nivy
What are heat shock proteins? Which family is reno-protective, and which HSP in particular?
HSPs: ubiquitous cytoprotective cellular proteins
HSP70 = reno-protective, esp HSP72
JVIM 2021, Nivy
These novel urinary biomarkers are most predictive of AKI when used together, but which single marker performs best? Which two were worst?
GGT, ALP, HSP70, IL-6, IL-18
Best = IL-6. Worst = HSP70, not predictive at all = IL-18.
JVIM 2021, Nivy
How do these novel urinary biomarkers (GGT, ALP, HSP70, IL-6, IL-18) compare with SDMA in predicting AKI?
Similar
JVIM 2021, Nivy
For serum and urine L-FABP and NGAL, which was most sensitive/specific for CKD? Did presence of hyperthyroidism affect these?
uL-FABP/Cr is high with CKD. Better sens/spec than sL-FABP. High in ~1/3 of hyperthyroid cats but no correlation with T4. NGAL was useless.
JVIM 2021, Kongtasai
Using an AI algorithm, which variable was the best predictor of short and medium term survival?
Clinical severity score
Age
Body weight
Creat at 48hrs
Appetite at 48hrs
Creat at 48hrs
JFMS 2021, Renard
What are Bracchi Italiani dogs predisposed to?
A) Cysteine urolithiasis
B) Urate urolithiasis
C) Primary renal hematuria
D) Familial proteinuric kidney disease
E) Minimal change disease
D) Familial proteinuric kidney disease
JAVMA 2021, Inman
What portion of the kidney is most commonly affected by incidental renal infarcts, and what is one possible explanation?
Caudal pole (55%) – no collateral blood supply
JVIM 2021, Sutthigran
What is the primary diagnosis in most dogs with incidental renal infarcts: infection, inflammation, or cancer
Cancer
JVIM 2021, Sutthigran
Most of the following factors had roughly half and half distribution in dogs with incidental renal infarcts. Which THREE were overrepresented?
Male vs female
R vs L kidney
Cranial vs caudal pole
1 lesion vs multiple
Grade 1 infarct vs > grade 1
Uni- vs bilateral
Caudal pole 55%
Unilateral 56%
Grade 1 84%
JVIM 2021, Sutthigran
What do the different grades of renal infarct (1, 2, 3) mean?
1: <25% of the kidney; likely blockage of small branch of the renal artery
2: 25-50%, blockage of a major branch
3: >50%
JVIM 2021, Sutthigran
True or False:
Contrast induced nephropathy carries a very guarded prognosis.
False. In a study of 3 animals with CIN, all had improvement or resolution of AKI within 2 weeks.
JAVMA 2021, Griffin
What is the cutoff in difference between kidney size to diagnose big kidney-little kidney syndrome?
0.7cm
JVIM 2021, Wu
Name at least 3 factors that could suggest ureteral obstruction as a cause for big kidney-little kidney syndrome vs other causes.
–Larger difference in kidney length
–Elevated creat
–Hyperkalemia
–Lower urine pH (since most ureteral stones are CaOx)
JVIM 2021, Wu
What is an early marker of CKD-mineral and bone disorder (MBD)?
High FGF-23
JVIM 2021, Miyakawa
Describe the normal physiology of fibroblast growth factor 23 (FGF-23).
–What stimulates its release? What makes it?
–What is the co-receptor called and what does it do?
–Where does FGF-23 bind and what does it do there? (2 different organs)
–What is the net effect of FGF-23?
–High phos OR high calcitriol stimulates FGF-23 release by osteoclasts
–FGF-23 binds to receptors on kidney and parathyroid gland.
–Klotho is a co-receptor that incr binding affinity of FGF-23.
–FGF-23 binding in kidney –> downregulate Na-Phos cotransporter in renal tubule, decr calcitriol synthesis
–FGF-23 binding in parathyroid gland –> decr PTH
–Net effect: incr urinary phos excretion, decr intestinal phos absorption
JVIM 2021, Miyakawa
FGF-23 and CKD:
–Is it high or low? Name 3 mechanisms that influence this.
–Does it occur before or after PTH and phos are increased?
–Does it affect prognosis?
–FGF-23 is high due to decr renal clearance, response to hyperphosphatemia, and decr klotho
–Occurs before high PTH, phos
–Negative prognostic indicator (unclear if simply a marker or if promotes progression of CKD)
JVIM 2021, Miyakawa
What are two potential consequences of hypercalcemia in CKD cats?
Decr GFR, nephrocalcinosis/stones
JVIM 2021, Geddes
What effect does a renal diet with strict phosphorus restriction and high Ca:P have on PTH, FGF-23, Ca, phos?
Low-normal PTH
High-normal FGF-23
High Ca
Normal phos
JVIM 2021, Schauf
How does the Ca:P and fiber content in a diet affect Ca absorption?
Ca:P: The closer to 1:1, the less of each will be absorbed b/c they’ll be bound to each other. High ratio (ie, more Ca) –> more Ca absorption. Low ratio (ie, more phos) –> more Phos absorption.
Fiber slows intestinal transit times, resulting in more bound Ca and decr absorption.
JVIM 2021, Geddes
In a group of cats with experimentally induced CKD fed a severely phos and protein restricted diet, most had improved azotemia, high-normal FGF-23, low-normal PTH, and hypercalcemia. What was the effect of switching to a moderate protein and phos diet with a lower Ca:P ratio? What does this imply about diet in CKD cats?
Stable azotemia, decr FGF-23, resolved hypercalcemia –> might be better to restrict protein and phos less in CKD diets.
JVIM 2021, Schauf
In a study of cats with naturally occurring CKD and hypercalcemia that developed while on a renal diet with very restricted phos and higher Ca:P ratio (RC Renal), what happened when they were switched to a moderate phos diet (RC senior)? (Ca, phos, FGF-23, PTH, CKD stage)
What happened with the cats that were hypercalcemic prior to renal diet? (Ca, phos, PTH, CKD stage)
–CKD + hypercalcemia when on renal diet: resolved hypercalcemia, no change phos and FGF-23 (ie, higher dietary phos did not make things worse), incr PTH but still WNL (probably b/c no longer suppressed by hypercalcemia)
–CKD + hypercalcemia prior to renal diet: no change in Ca or PTH, lower phos
–Neither group had progression in CKD
JVIM 2021, Geddes
What is the effect of omeprazole (SID x 14d) on appetite and body weight in CKD cats?
Statistically, but not clinically, significant incr in food intake (2.7%). No change in body weight.
JVIM 2021, Spencer
Other than ID/tx of underlying cause, what are four other medication groups to consider for renal proteinuria?
Immunosuppressants (if indicated)
Omega-3 FAs
Antithrombotics
Angiotensin II inhibitors (ACEi, ARB, spironolactone)
JVIM 2021, Lecavalier
What is ACE escape? Name one drug class that is affected by this, and one that isn’t.
Tx with ACEi –> alternate pathway for ATII generation. Does not affect ARBs.
JVIM 2021, Lecavalier
What receptors do ARBs selectively act on? What receptor is left alone, and what does it do?
ARBs block Angiotensin II type 1 (AT1) receptors. ATII can still bind AT2 –> renoprotective (vasodilation, natriuresis, inhibit inappropriate cell growth).
JVIM 2021, Lecavalier
Why is telmisartan used over losartan in dogs?
Dogs cant metabolize losartan to the active drug.
JVIM 2021, Lecavalier
In proteinuric dogs treated with telmisartan:
–What proportion (few, some, most) achieved the goal of UPC <0.5 or >50% decr from baseline?
–When did most dogs have at least a partial response?
–When did most dogs plateau?
–Most had good response to telmisartan
–Start improving at 1mo
–Plateau at 6mo – stable therafter
JVIM 2021, Lecavalier
Telmisartan adverse effects:
–Proportion with incr creat by >30% after starting?
–Proportion with GI signs?
–Effect on K+?
–Did either result in discontinuation of telmisartan?
–4% had incr creat – d/c drug
–11% mild, transient GI signs – able to continue
–K+ normal for all dogs (telmisartan probably affects aldosterone less than ACEi)
JVIM 2021, Lecavalier
What is the most common cause of ureteral obstruction in cats?
Ureteroliths (esp CaOx)
JVIM 2021, Testault
How does plain CT compare with AUS in terms of ureterolith identification and localization?
CT better for identification and localization, esp proximal and distal ureters (probably harder to see on AUS) and bilateral ureteroliths (ultrasonographer may have stopped looking after finding one).
Few cases where AUS found stones missed on CT – but for all of those, CT found at least some stones.
JVIM 2021, Testault
What are the renal pelvis dilation (mm) cutoffs associated with ureteral obstruction with AUS and CT, respectively, based on one study?
AUS >5mm, CT >3mm –> always ureteral obstruction (calculi)
JVIM 2021, Testault
True or False:
Urotomy for ureteral obstruction is important in additional to SUB placement, as this preserves another pathway if SUB obstructs and removes a site of potential persistent infection.
False. Increases procedure duration and complexity but no short or long term benefit – don’t do it!
JVIM 2021, Butty
True or false:
Severe azotemia, and particularly preexisting CKD, negatively impact prognosis in cats with ureteral obstruction and this should be considered prior to pursuing SUB placement.
False!! Most have a good outcome regardless!
JVIM 2021, Butty
True or False:
Pyuria and bacteriuria should be treated with antibiotics in cats with SUBs. If persists despite abx, consider SUB removal +/- replacement (if ureter not patent) out of concern for biofilm formation.
False!! Don’t treat unless LUT signs present or azotemia is progressive. Can have pyuria and bacteriuria for years and doesn’t necessarily cause problems.
JVIM 2021, Butty
True or False:
AUS guidance (rather than fluoroscopy) is highly successful for SUB placement, even if there is minimal (<4mm) renal pelvis dilation.
True
JVIM 2021, Butty
What proportion of cats with ureteral obstruction will improve with medical management?
13%
JVIM 2021, Wuillemin
True or False:
Bilateral ureteral obstruction is rare.
False – up to 44% depending on the study
JVIM 2021, Wuillemin
Are ureteral obstruction via stones or stricture associated with a longer hospital stay +/- worse outcome?
Stricture – may cause a more chronic obstruction
JVIM 2021, Wuillemin
What is the range of survival to discharge with SUBs, depending on the study?
80-100% – most are 90+ %
JAVMA 2018 Berent
JVIM 2021, Wuillemin
JFMS 2021 Vrijsen
In cats with ureteral obstruction treated with SUB placement:
–When does renal pelvis dilation improve?
–When does azotemia stabilize (and can IRIS stage them)?
–What effect does SUB placement have on CKD progression?
–Immediately
–1mo
–No effect – similar survival to cats with that stage CKD that don’t have UO/SUB placement
JVIM 2021, Wuillemin
What proportion of cats with SUB placement have long term recurrent LUT signs? What has been changed about the procedure to decrease the incidence of this?
14%. Might be due to straight bladder catheter. Now we use short straight catheters or locking loop catheters.
JVIM 2021, Wuillemin
When SUBs obstruct:
–Proportion of cats?
–Median time frame?
–Typical cause?
–Need for intervention?
–17%
–7mo
–Mineral debris suspected
–Half had no renal pelvis dilation – presumed ureter was patent so no intervention needed
JVIM 2021, Wuillemin
What is the overall MST for cats with SUB placement?
1.9-4.2 years, depending on the study and preexisting CKD
JVIM 2021, Butty
JVIM 2021, Wuillemin
For a study of 31 dogs with intramural ectopic ureters:
–What proportion were female?
–Proportion with normal AUS?
–Proportion with concurrent vestibulovaginal abnormalities?
–What proportion were continent with cystoscopic laser ablation alone?
–With meds added?
–All female
–22% normal AUS
–90% concurrent vestibulovaginal abnormalities
–45% continent with CLA only
–68% with meds added
JVIM 2021, Hooi
What is the relative frequency and degree of LUT signs post cystoscopic laser ablation for dogs with ectopic ureters?
Uncommon, mild
JVIM 2021, Hooi
How does age impact outcome of dogs with ectopic ureters treated with cystoscopic laser ablation?
No impact
JVIM 2021, Hooi
What factors contribute to ongoing incontinence in dogs with corrected ectopic ureters?
Unknown – probably other concurrent congenital problems
JVIM 2021, Hooi
What are the diagnostic criteria for obesity-related metabolic dysfunction (ORMD)? What is the similar syndrome in people called?
BCS >7/9 PLUS two of the following:
–High TG, Chol, BP, BG
–DM
Similar to metabolic syndrome in people – but dogs don’t experience many of the complications people do (ex: atherosclerosis)
JVIM 2021, Paulin
What proportion of obese dogs have obesity-related metabolic dysfunction (ORMD)?
20%
JVIM 2021, Paulin
Which are risk factors for uroliths based on one study? Which may have been confounded due to the design of the study?
High TG, Chol, BG; obesity, USG, pH
Risk factors: high TG, BG, low USG** (but were on urinary diet and encouraged incr H2O), obesity** (but controls = healthy staff pets)
No difference between stone and control groups: chol, urine pH** (but many were on urinary diet)
** = confounded by study design
JVIM 2021, Paulin
Which urolith stone type is most common in each sex category and why?
–Male
–Female
–Intact male
–Male: CaOx (females probably pass them easier)
–Female: struvite (urease UTI)
–Intact male: cystine – androgen dependent (type III cystinuria)
JVIM 2021, Kopecny
What are the three basic causes for cystine uroliths?
–High methionine diet (cystine precursor) – animal meat, tofu, nuts, wheat
–Genetics (type I and type II cystinuria) – mastiff, pitbull, bulldog, rotties
–Androgen dependent (type III cystinuria) – intact males
JVIM 2021, Kopecny
What is the genetic mutation associated with urate uroliths? Name three predisposed breeds.
SLC2A9 –> hperuricosuria
Dalmation, bulldogs, English bulldogs
JVIM 2021, Kopecny
Which two breeds are prone to xanthine stones?
Dalmation (probably due to allopurinol for urates)
CKCS (genetic)
JVIM 2021, Kopecny
_________ uroliths usually form a composite with _________ uroliths.
Apatite, struvite
JVIM 2021, Kopecny
Which cat breeds are overrepresented for urate uroliths?
Ocicat, siamese
JVIM 2021, Kopecny
True or False:
Urate urolithiasis in a cat is uncommonly due to portosystemic shunt.
True
JVIM 2021, Kopecny
Does urine Mg increase or decrease formation of CaOx stones?
Decrease
JVIM 2021, Kopecny
What is the prevalence of UTI with struvite stones in cats? Are abx indicated even if no LUT signs and stones are removed?
11%, no
JVIM 2021, Kopecny
Which dog breed is prone to sterile struvite uroliths?
Pugs
JVIM 2021, Wingert
In one study of 50 dogs with uroliths:
–What proportion had successful dissolution with diet?
–Median time to decr stone burden? (How does this affect whether to continue or d/c diet trial?)
–Median time to complete resolution?
–How did number and size of stones affect outcome?
–68%
–Improvement at median 29d. So, if no improvement by 1-2mo, probably not struvite – consider other tx.
–Complete resolution median 35d (but as long as 5.5mo).
–No effect
JVIM 2021, Wingert
What is the most common bacteria found in UTIs with struvite uroliths? What is the average duration of abx use in these dogs while also undergoing diet therapy for dissolution?
Staph, 4wks (some d/c’d prior to documenting resolution of stones)
JVIM 2021, Wingert
What risk factors are vets concerned for when considering dietary dissolution of uroliths (unknown composition)? What is the actual prevalence of these? (Name three.)
–Urethral obstruction 8% – usually in dogs who originally presented obstructed (so don’t do diet only for these dogs)
–Pancreatitis 4%
–Persistent LUT signs 2%
JVIM 2021, Wingert
True or False:
Risk factors for possible struvites (breed, alkaline urine, urease UTI, stone number and size) are not highly predictive – reasonable to try dietary dissolution even if risk factors not present.
True – risk factors are hit and miss. Give diet a shot before more invasive stuff.
JVIM 2021, Wingert
In a study of 21 dogs with LUT signs and voided urine sample:
–What was the sens/spec and PPV/NPV of point of care RIA dipstick compared with UCS?
–Is this overall more or less accurate than urine microscopy?
–Any caveats about these results?
–POC RIA: Sens 89, Spec 100, PPV 100, NPV 92.
–Urine microscopy is still more accurate (sens 93, spec 99, PPV 94, NPV 99)
–Caveats: this study was small so the confidence values were wide; hard to compare with other studies since they often used cystos, didn’t require LUT signs to be present
JVIM 2021, Grant
In a study of 50 healthy dogs with no LUT signs, how many had a positive UCS? How many had positive next generation DNA sequencing (NGS)?
No positive UCS, all had lots of bacteria and fungi on NGS
JVIM 2021, Melgarejo
What is the most common bacterial cause of pyelonephritis? What is the best first line abx for this? Which two common empiric abx aren’t good for this and why?
E. coli. Best = fluoroquinolone. Bad = beta lactams, convenia (don’t reach adequate tissue concentration).
JVIM 2021, Weese
What is a very effective minimum duration of abx for uncomplicated UTI?
3-5d
JVIM 2021, Weese
In hospitalized dogs, how common is incomplete urine voiding? When does this peak?
Common (88%), peaks at 3d. But, unclear whether it’s a clinically relevant problem.
JVIM 2021, Vasquez
How does SediView compare with traditional reference lab UA for detection of casts (agreement, sens, spec)? What is one major drawback to the automated images SediView obtains compared with manual UA?
Moderate agreement.
–Low sensitivity (52%) but UA not perfect either. Sediview caught 36% of cases UA missed.
–Spec pretty good (90%) but higher false positives than UA – Dr should review images.
SediView automatically takes images at 40x. Hard to determine length, size, and type of cast (should be using low power).
JVIM 2021, Vasilatis