Hiperparatireoidismo Flashcards

H2020

1
Q

Quais seriam as principais causas de hiperparatireoidismo ?

A

adenoma de paratireoide

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2
Q

Qual é a grande importância das glândulas paratireoides ?

A

manter [Ca sérico] em faixa de concentração bem estreita !!

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3
Q

Quais sao os seus principais alvos de ação ?

A

The hormone acts directly on bone and kidney and indirectly on the intestine through its effects on synthesis of 1,25(OH)2D to increase serum calcium concentrations; in turn, PTH production is closely regulated by the concentration of serum ionized calcium

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4
Q

O que estimula a secreção de PTH ? Qual é a relação do PTH com o Magnésio ?

A

Ca IONIZADO! PARATIREOIDE precisa do [Mg] INTRACELULAR p/ poder secretar ( caso de hipomagnesemia -> produz mas n secreta )

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5
Q

Mutações que levam a ganho de função de CaRS, levam a : E qual seria a relação do magnésio com o PTH, e por conseguinte , com o [Ca] sérico ?

A

ganho de função de CaRS -> hipercalcemia hipocalciurica perda de função de CaRS-> hipocalcemia hypermagnesemia suppresses and hypomagnesemia stimulates PTH secretion

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6
Q

Quais seriam as principais causas de HIPERCALCEMIA PTH dependente ?

A

A. Primary hyperparathyroidism 1. Adenoma solitario ! ->>> 80% 2. Multiple endocrine neoplasia 3. Carcinoma B. Lithium therapy C. Familial hypocalciuric hypercalcemia

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7
Q

Qual seria a relação do lítio com o cálcio iônico ?

A

long-standing stimulation of parathyroid cell replication by lithium may predispose to development of adenomas (as is documented in secondary HPT and renal failure).

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8
Q

Quais síndromes podem estar relacionadas a hiperparatireoidismo?

A

MEN 1 MEN 2

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9
Q

Chronic hypocalcemia is less common than hypercalcemia; causes include chronic renal failure, hereditary and acquired hypoparathyroidism, vitamin D deficiency, PHP, and hypomagnesemia.

A

hypermagnesemia suppresses and hypomagnesemia stimulates PTH secretion.

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