Hypocalcemia Causes Quiz

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Questions and Answers

What is the primary effect of the absence of PTH on calcium levels in the serum?

Increased absorption of calcium from the gastrointestinal tract
Enhancement of bone calcium release into the bloodstream
Improper regulation, leading to lower serum Ca2+ levels (correct)
Reduced excretion of calcium by the kidneys

Which of the following conditions is NOT related to primary hypoparathyroidism?

Destruction of the parathyroid gland
Chronic kidney disease (correct)
Parathyroid gland aplasia
Removal of the parathyroid gland

How does hypomagnesemia contribute to hypocalcemia?

It suppresses PTH secretion, causing lower calcium levels (correct)
It enhances the reabsorption of calcium in the kidneys
It increases intestinal calcium absorption
It directly increases calcium release from bones

What is a significant consequence of impaired vitamin D metabolism in the absence of PTH?

<p>Decreased intestinal absorption of calcium (A)</p> Signup and view all the answers

In primary hypoparathyroidism, why does bone tend to retain its calcium storage?

<p>Because PTH is necessary for calcium mobilization from bones (B)</p> Signup and view all the answers

Flashcards

Hypocalcemia

A condition where the blood calcium levels are abnormally low.

Primary Hypoparathyroidism

A condition where the parathyroid gland is not functioning properly, leading to low levels of parathyroid hormone (PTH).

Impact of Hypoparathyroidism on Calcium Regulation

When PTH is absent, the body holds onto calcium in the bones and increases its excretion in urine.

Role of PTH in Vitamin D Metabolism

Without sufficient PTH, vitamin D metabolism is affected, leading to further decreased calcium levels.

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Hypomagnesemia and Hypocalcemia

Low magnesium levels can also cause hypocalcemia, as magnesium is necessary for PTH function.

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Study Notes

Hypocalcemia Causes

Insufficient parathyroid hormone (PTH) impairs calcium regulation.
This leads to increased calcium storage in bone and higher calcium excretion by the kidneys.
Reduced vitamin D levels result from the lack of PTH's role in vitamin D metabolism.
This further decreases calcium levels.
Primary hypoparathyroidism arises from gland aplasia, destruction, or removal.
Chronic hypomagnesemia, a growing issue in hospitalized patients, is a frequent cause.

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Description

Test your knowledge on the various causes of hypocalcemia, including the role of parathyroid hormone and vitamin D metabolism. This quiz covers primary hypoparathyroidism and the impact of chronic hypomagnesemia. Explore how these factors contribute to calcium regulation.