Parathyroid Flashcards
Calcium is used as a stabilizer of the cardiac cell membrane against depolarization in _____
severe hyperkalemia
why is Ca2+ so important
- helps muscles contract/relax
- keeps bones strong
- helps in clotting
how does body maintain Ca2+ homeostasis in bones
- body senses low serum Ca2+
- parathyroid releases PTH
- PTH stimulates osteoclasts = Ca2+ mobilized from bone into blood
how does body maintain Ca2+ homeostasis in kidneys
- body senses low Ca2+
- parathyroid releases PTH
- increased reabsorption of Ca2+ in kidneys
- Vit D production > stimulates Ca2+ reabsorption in GI tract
which cells mobilize Ca2+ from bone into the blood
osteoClasts
what might you see on EKG for pt with primary hyperparathyroidism
- prolonged PR
- shortened QT
- bradycardia
- BBB
- asystole
(d/t hypercalcemia)
what should pt avoid if they have primary hyperparathyroidism
- thiazide diuretics
- antacids (Tums)
- large doses of Vit A or Vit D
Pt presents with fatigue and tetany and has +Chvostek’s sign and +Trousseau sign.
Dx?
Hypoparathyroidism
chovstek sign
contraction of eye, nose, mouth muscle by tapping facial nerve at TMJ
trousseau sign
spasms in hand and wrist with compression to forearm
what might you see on EKG of pt with hypocalcemia
- prolonged QT
- T wave abnormalities
what should pt with hypoparathyroidism avoid
meds that lose Ca
- furosemide
Tx for hypoparathyroidism
Ca and Vit D supplements
