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Equine Medicine > Urinary Tract Diseases > Flashcards

Urinary Tract Diseases Flashcards

1
Q

What is uroperitoneum? In what horses is it most common?

A

leakage of urine into the peritoneal space

colts > fillies

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2
Q

What is the most common cause of uroperitoneum in mares? What are 4 possible causes in foals?

A

trauma during parturition causes rupture to the bladder or urachus

  1. prolonged recumbency
  2. dummy foal bladder
  3. rupture secondary to cystitis in septicemic foals
  4. rupture of urachus due to umbilical abscesses
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3
Q

What are clinical signs of uroperitoneum in foals?

A

appears normal at birth, signs begin in 1-3 days:

  • depression, anorexia
  • tachycardia, shallow breathing
  • abdominal distension (percussion wave)
  • straining to urinate, dribbling
  • intestinal ileus, dehydration
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4
Q

What 5 things are seen on biochemistry in cases of uroperitoneum?

A
  1. hyperkalemia*
  2. hyponatremia
  3. hypochloremia
  4. increased or normal BUN/creatinine
  5. metabolic acidosis
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5
Q

What is the most common sign on ultrasound of uroperitoneum? What should be checked for?

A

hypoechoic free abdominal fluid

umbilical remnants - urine can accumulate

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6
Q

What are 2 important aspects of peritoneal fluid from uroperitoneum?

A
  1. pale, yellow, copious, urine smell
  2. creatinine in fluid/serum > 2
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7
Q

What are 3 things seen on ECGs in cases of uroperitoneum? Why?

A
  1. broad QRS
  2. tall T wave
  3. bradycardia, arrhythmias (block)

increased potassium in serum

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8
Q

What is the first part of treatment of uroperitoneum? In what 3 ways is this done?

A

STABILIZE

  1. controlled abdominal drainage with teat cannula or 16F tube
  2. correct hyperkalemia
  3. check potassium every hour until < 5.5 mEq/L achieved
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9
Q

What are 2 options for correcting hyperkalemia in patients with uroperitoneum?

A
  1. 0.9% NaCl with 5-10% dextrose and calcium borogluconate
  2. sodium bicarbonate if acidotic with insulin/dextrose
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10
Q

After patients with uroperitoneum are stabilized, what is done?

A

surgery (not an emergency!)

  • repair
  • indwelling catheter
  • antimicrobials, NSAIDs
  • good prognosis!
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11
Q

In what horses are UTIs most common? What is the most common etiology?

A

mares > geldings, stallions

usually ascending infections due to defects, obstructions, catheters, or paralysis, which leads to urethral colonization and the bladder and kidneys

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12
Q

What are the 9 most common pathogens that cause UTIs?

A
  1. E. coli
  2. Proteus mirabilis
  3. Klebsiella spp.
  4. Enterobacter
  5. Streptococcus
  6. Pseudomonas aeruginosa
  7. Corynebacterium renale
  8. Candida
  9. rhinitis virus
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13
Q

What are the most common signs of UTIs in males? What are the 2 overall most common signs?

A

urethritis, hemospermia (stallion)

  1. CYSTITIS - pollakiuria, stranguria, hematuria, pyuria, scalding, crystals
  2. PYELONEPHRITIS - can go undetected, nephrolithiasis, CKD, hematuria, pyuria, fever, weight loss, anorexia, depression
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14
Q

What is seen on UA in cases of UTIs?

A
  • > 10 WBC/hpf, bacteria
  • quantitative urine culture >10000 CFU/mL
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15
Q

What are 4 important aspects to treating UTIs?

A
  1. correct primary cause
  2. antimicrobials ideally based on culture for >7 days, 4-6 weekds
  3. NSAIDs - Banamine
  4. phenazopyridine
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16
Q

What 5 antimicrobials are recommended for UTI treatment? Why?

A
  1. TMS
  2. Tetracycline
  3. Ceftiofur
  4. Ampicillin
  5. Pen/Gen

concentrate well in urine

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17
Q

Why is phenazopyridine used in UTI treatment? What side effect is common?

A

topical anesthetic that relieves burning, irritation, discomfort, and frequent urination

turns urine orange

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18
Q

What is the difference between sulfamethoxazole and sulfadiazine?

A

SM = inactive

SD = unchanged, greater concentrations in urine

19
Q

What changes to lifestyle can be made to treat/prevent UTIs?

A
  • pasture access
  • diet supplementation with 50-75 g of loose salt
  • warm water
20
Q

What is the most common urolithiasis in horses? In what horses is it most common?

A

calcium carbonate

  • older horses
  • males > females - longer urethra that is less distensible
21
Q

What is the most common site for urolithiasis?

A

bladder > urethra > kidney, ureter

often more than one stone!

22
Q

What are 3 urinary factors that increase chances of developing urolithiasis? Diet factor?

A
  1. alkaline pH
  2. naturally high incidence of crystalluria, concentration of mucoproteins, and mineral content
  3. urine stasis

high mineral content

23
Q

What are 3 additional factors that increase chances of developing urolithiasis?

A
  1. urinary retention and stasis
  2. decreased water intake
  3. bacterial infection
24
Q

What are the 2 types of calcium carbonate stones in horses?

A

TYPE 1 - most common, spiculated, easier to break down manually

TYPE 2 less frequent, smooth, harder to break down

25
Q

What is the most common sign of urolithiasis? What else is seen?

A

hematuria after exercise

  • frequent, painful urination
  • incontinence, dribbling
  • colic
  • tenesmus
  • tail swishing, stamping hind feet
26
Q

When is rectal palpation done to diagnose urolithiasis? Where is the bladder found? What is required for this diagnostic?

A

when the bladder is empty

very close to rectal inlet in front of the pelvic rim

  • sedation, epidural
  • buscopan: control of abdominal pain (colic)
27
Q

What are the 2 most common diagnostics for urolithiasis?

A
  1. ultrasound of the entire urinary tract
  2. UA and quantitative culture (for treatment of secondary infection)
28
Q

What 2 treatments are recommended for urolithiasis? What is done following this?

A
  1. manual breakdown - mare, small hands, sedation, epidural
  2. fragmentation by laser lithotripsy via endoscope
  • culture and urolith analysis
  • antibiotics for 7-10 days
  • catheter
  • NSAIDs
29
Q

What 3 surgeries can be done in uroliths that are unable to be broken down?

A
  1. cystotomy
  2. perineal urethrotomy or urethrostomy
  3. urethral sphincterectomy
30
Q

In what 4 ways can the diet be altered to prevent urolithiasis?

A
  1. balance mineral consumption
  2. change from legume to grass hay
  3. urinary acidification by ammonium chloride, ammonium sulfate, or ascorbic acid
  4. increase water consumption, can be induced by giving some salt

(recurrence common)

31
Q

What is sabulous urolithiasis? What are 2 clinical signs?

A

large quantities of crystalloid sediment (calcium carbonate) that accumulate on the bladder floor, compromising its emptying —> incontinence

  1. urinary incontinence with scalding
  2. neurologic signs
32
Q

How is sabulous urolithiasis diagnosed? What 3 treatments are recommended?

A

neurologic exam, rectal exam, endoscopy

  1. repeated bladder lavage
  2. encourage bladder emptying with bethanechol or phenazopyridine
  3. broad spectrum antimicrobials
33
Q

What is seen on cytology in cases of hematuria?

A

> 5 RBC/hpf

34
Q

What are some common causes of hematuria?

A
  • urolithiasis
  • UTI
  • neoplasia
  • exercised-induced (without cystoliths)
  • proximal ureter tears
  • idiopathic renal hematuria
  • idiopathic cystitis
35
Q

How can timing be used to localize the site of hematuria?

A
  • throughout urination: kidneys, ureters, bladder
  • beginning of urination: distal urethra
  • end of urination: proximal urethra, bladder neck
36
Q

What is the etiology of urethral tears? Where is this most common? Why is it difficult to diagnose?

A

high pressure in corpus spongiosum

proximal urethra at the level of the ischial arch

often heals into a fistula

37
Q

How are urethral tears diagnosed? What doesn’t seem to help?

A
  • history, clinical signs
  • hematuria at the end of urination with urethral contractions
  • endoscopy

antimicrobials

38
Q

How are urethral tears treated?

A

temporary subischial perineal urethrotomy to relieve pressure

often no treatment is necessary - breeding rest for stallions is recommended

39
Q

What is the etiology of idiopathic renal hematuria? What horses seem to be predisposed?

A

sudden onset of gross hematuria due to episodic hemorrhage from 1 or more kidneys (no other signs)

Arabians

40
Q

How is idiopathic renal hematuria diagnosed? Treated? What is prognosis like?

A

exclude other causes of hematuria or clotting disorders + endoscopy, ultrasound

  • supportive care: aminocaproic acid, formalin
  • nephrectomy: bleeding will likely occur from other kidney

will bleed again and worsen over time - fatal bleeding is possible!

41
Q

What are 3 congenital causes of urinary incontinence?

A
  1. patent urachus
  2. septic omphalitis/omphalophlebitis
  3. ectopic ureter
42
Q

What are 5 neurologic causes of urinary incontinence?

A
  1. sacral or coccygeal trauma
  2. EHV-1, EPM, rabies
  3. EDM
  4. polyneuritis equi
  5. neoplasia
43
Q

What are some iatrogenic, hormonal, and toxicological causes of urinary incontinence?

A

IATROGENIC - epidural alcohol, urethral sphincter damage

HORMONAL - estrogen-responsive

TOXIC - sudan grass, sorghum cystitis ataxia

44
Q

What is the most common signs of urinary incontinence?

A

urine scalding of legs and perineum

(+ smell)

Equine Medicine (33 decks)

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