Calcium, Phosphorus, and Magnesium Flashcards Preview

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Flashcards in Calcium, Phosphorus, and Magnesium Deck (12):
1

What are major factors that determine serum calcium levels?

PTH activity: bone resorption
Vitamin D: Enhances Ca reabsorption from bone
Calcitonin: blocks osteoclastic activity

2

Horses are different in that ____ can affect their serum Ca levels

GFR

3

Hypercalcemia can be caused by:

1. Increased PTH activity
2. Increased Vitamin D activity
3. Neoplasia in bone
4. Renal insufficiency or failure (Horses)
5. Hypoadrenocorticism

4

Hypocalcemia often comes about via

Decrease in the protein bound fraction

5

What are some things that can cause hypocalcemia?

Hypomagnesemia
Exocrine pancreatic insufficiency
Primary hypothyroidism
Chronic renal disease
Protein losing enteropathy

6

What causes parturient hypocalcemia in cattle?

Excess Calcium loss in milk/to fetus
Decreased target cell response to PTH

7

Excessive urinary loss of Calcium can be caused by what?

Ethylene glycol toxicosis
Metabolic alkalosis
Furosemide treatment

8

What condition can falsely increase organic phosphorus amounts?

Hemolysis

9

What are some factors that can influence serum phosphorus?

Renal clearance
GI absorption
Bone resorption
Shifting between ECF and ICF

10

What can cause hypophosphatemia?

Decreased GFR
Bladder rupture
Hypoparathyroidism
Increased Vit D
Exogenous PO4

11

What can cause hyperphosphatemia?

Myopathies
Acute tumor lysis syndrome
Hyperthyroidism
Lactic acidosis

12

Hypermagnesemia can be driven by what?

Decreased GFR
In vivo hemolysis
Increased PTH