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DIT Calcium quiz
| Question | Answer |
|---|---|
| functions of vitamin D | increased intestinal absorption of calcium and phosphate, increased bone resorption of calcium and phosphate |
| How does PTH affect calcium | increases it |
| How does PTH affect phosphate | decreases it |
| what cells secrete calcitonin | C cells of the thyroid (parafollicular) |
| 2 signs of hypocalcemia | Chovsteks, Trousseaus |
| What are the 2 most common causes of primary hyperparathyroidism? | adenoma, parathyroid hyperplasia |
| Underlying cause of renal osteodystrophy | nephron loss causes decreased vitamin D which leads to phosphate retention, increased PTH, decreased Ca (and bone lesions), incerased Alk Phos |
| What agents can be used to treat osteoporosis? | Ca, Vit D, bisphosphanates, pulsatile PTH, Calcitonin, Tamoxifen/roloxifene, testosterone |
| What hormones work via tyrosine kinase second messengers? | GH, prolactin |
| What cancers are a/w hypercalcemia? | squamous cell cancers, RCC, breast cancer, MM |
| young woman with short stature and shortened 4th and 5th metacarpals. Endocrine disorder? | pseudohypoparathyroidism (albright's hereditary osteodystrophy |
| mechanism of bisphosphonates? | inhibits osteoclasts (=less breakdown) |
| possible causes of hypocalcemia? | thyroid surgery, a/i destruction, Digeorge (causing hypoPTH), pseudohypoPTH |