Urolithiasis In Ruminants/Camelids Flashcards

1
Q

Nidus + precipitation of materials =

A

Urolith

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2
Q

Precipitation of minerals results from:

A

Concentrated urine

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3
Q

5 things that can act as a nidus for stone formation:

A

Debris, casts, mucoprotein, cells, bacteria

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4
Q

What are the biggest 4 predisposing factors for Urolithiasis in camelids/ruminants?

A
  1. Being male
  2. Inappropriate Ca:P
  3. Poor water management
  4. Weather
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5
Q

What 2 things can can cause an inappropriate Ca:P in camelids/ruminants?

A
  1. High phosphorus diet (to much grain + concentrated pellets)
  2. High calcium diet (alfalfa hay!)
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6
Q

How does poor water management contribute to urolithiasis?

A

Animals don’t want to drink nasty H2O
Need to make sure clean fresh water is available
Lack of H2O = making more concentrated urine to reserve water

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7
Q

How does weather contribute as a predisposing factor to urolithiasis?

A

Cold weather = frozen water
No water = body makes more concentrated urine to save water

More concentrated urine = precipitation of minerals + Urolith formation

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8
Q

What are 3 other important predisposing factors for urolithiasis in ruminants/camelids?

A

Age

Breed

Geography

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9
Q

How does being male predispose to urolithiasis formation in ruminants/camelids?

A

Males have longer, narrower urethra

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10
Q

How does age relate to Urolith formation?

A

Testosterone influence causes a wider urethra
(Young, in-tact males)

Young animals are also less likely to develop calcium carbonate stones because those crystals take a long time to form

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11
Q

What breed are more predisposed to forming stones?

A

Breeds of African descent
(Boer, Pygmy, Nigerian Dwarf)

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12
Q

How is geography tied to Urolith formation?

A

Silicate and oxalate stones are uncommon in Ohio and more common out west

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13
Q

Normal ruminant on a normal balanced diet will have ______ salivary phosphate excretion
and _____ urinary phosphate excretion

A

Increased salivary excretion
Decreased urinary excretion

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14
Q

A ruminant on a high phosphorus diet will have:

______ salivary phosphorus excretion

_______ urinary phosphorus excretion

A

Decreased

Increased

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15
Q

Normal ruminant urine pH is _____

A

Alkaline

(7.2-8)

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16
Q

Normal USG for ruminants is:

A

1.015, 1.035

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17
Q

Fase positive or trace protein on a dipstick in a ruminant could be due to:

A

The naturally alkaline pH of their urine

18
Q

Normal Ruminant urine should not have glucose.

If you do see glucose in the urine, it could be due to:

A

Administration of alpha-2 agonist like xylazine

19
Q

What are the 2 most common places for stones to lodge in a ruminant/camelid?

A

Urethral process

Distal sigmoid flexure

20
Q

What is a third (slightly less common) place for stones to lodge in a ruminant?

A

Urethral diverticulum
(At ischial arch)

21
Q

If a stone is lodged in the urethral process of a goat, what is the likely first step in treatment?

A

Amputate it

22
Q

The urethral process is an _____ of the _____
Located at the _____ of the ______

A

Extension, urethra

Distal tip, penis

23
Q

The distal sigmoid flexure is the site of the insertion for the ________ muscle

A

Retractor penis

24
Q

The Sigmoid flexure in the urethra of a small ruminant allows stones to lodge because it is a
______ and has a ____ _____

A

Tight turn

Decreased diameter
(In comparison to rest of urethra)

25
Q

What are the 2 most common stone types you’ll see small ruminants present with in Ohio?

A

Struvites and Calcium carbonate stones

26
Q

Struvite crystals are chemically called:

A

Magnesium ammonium phosphate crystals

27
Q

What conditions do struvites form under?

A

Alkaline urine

Low Ca: P
——> from diet low in calcium, high in phosphorus

28
Q

Struvite crystals on on urine sediment look like:

A

Coffin lids

29
Q

Macroscopiclly, Struvites look like:

A

Gritty, white-tan sand

30
Q

What is important to remember about struvites and diagnostic imaging?

A

Struvites are not radio-opaque!

You ain’t gonna see them on rads

31
Q

Calcium carbonate crystals form due to:

A

High calcium ingestion

(Legumes like alfalfa hay and clover hay are very high in calcium!)

-hard water contains lots of calcium too

32
Q

Macroscopically, calcium carbonate crystals are:

A

Spherical and smooth and hard (not crushable)

33
Q

What is an important thing to remember about calcium carbonate crystals and diagnostic imaging?

A

Calcium carbonate crystals are radiodense!

You will see them on rads!

34
Q

Silicate stones form due to:

A

Ingesting plants grown in sandy soils that are rich in Silica

35
Q

What geographic region are you more likely to diagnose a patient with silicate stones?

A

Western and southwestern US

36
Q

silicate stones look like:

A

Jacks! Very spiky and bowsery looking

37
Q

Oxalate stones form due to

A

Ingestion of plants with high oxalate content

38
Q

What stone type is rare in ruminants?

A

Oxalate stones

39
Q

Are oxalate stones radio-opaque?

A

Yes

40
Q

What can be mistaken for struvites in small ruminants?

A

Amorphous magnesium calcium phosphate crystals

(They’re white, tan and gritty and are +/- radio-opaque)

Can be troublesome when trying to treat and prevent stone formation