Fiser ABSITE Ch. 23 Parathyroid Flashcards
Where do the superior parathyroid originate? and inferior?
4th pharyngeal pouch, 3rd pharyngeal pouch
Where are the superior parathyroids in relation to the RLNs? and the inferior?
lateral, medial
Where are the superior parathyroids in relation to the inferior thyroid artery? and inferior parathyroids?
above, below
What is the blood supply to the parathyroids?
inferior thyroid artery
What is the most common ectopic site for parathyroids?
tail of the thymus
What is a normal Ca level range?
8.5-10.5
What is a normal PTH level range?
5-40
What is the most common cause of hypoparathyroidism?
previous thyroid surgery
What is the name form bone lesions from Ca resorption; characteristic of hyperparathyroidism?
Osteitis firbrosa cystica (brown tumors)
Indications for parathyroid surgery include symptomatic disease or asymptomatic disease with Ca above what level?
13
What percentage of pts with hyperparathyroid have single adenoma? multiple adenomas? diffuse hyperplasia?
single adenoma 80%
multiple adenomas 4%
diffuse hyperplasia 15%
Hyperparathyroidism in pregnancy carries a risk of still birth. In what trimester do you operate?
2nd
What is the half-life of PTH?
10 minutes
What should be done if parathyroid CA is found?
radical parathyroidectomy and take ipsilateral thyroid
What are the three causes of postop hypocalcemia after parathyroid surgery?
bone hunger, hypomagnesmia, failure of parathyroid remnant or graft