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Related Concept Videos

The Parathyroid Glands00:59

The Parathyroid Glands

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The two pairs of parathyroid glands embedded within the posterior surface of the thyroid gland are restricted by a dense capsule around them. These glands comprise two distinct cell populations—parathyroid oxyphil and parathyroid principal cells- pivotal in calcium homeostasis.
Oxyphil cells, whose functions remain elusive, emerge during late puberty, adding a layer of complexity to the parathyroid gland's intricacies. In contrast, principal parathyroid cells undertake a vital role by...
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Skeleton and Calcium Homeostasis01:21

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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
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Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
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Synthesis and Functions of Calcitonin00:51

Synthesis and Functions of Calcitonin

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Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
The exact mechanisms by which calcitonin operates in calcium homeostasis remain elusive, but its significance is evident in several vital...
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Roles of Electrolytes: Calcium and Phosphate01:27

Roles of Electrolytes: Calcium and Phosphate

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Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
The calcium concentration in blood plasma is primarily...
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Bone Disorders01:29

Bone Disorders

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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Reassessing parathyroidectomy outcomes in kidney transplant recipients with hyperparathyroidism: A fragility-index focused review.

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Related Experiment Video

Updated: May 24, 2025

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy
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Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

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Patients with normocalcemic versus hypercalcemic hyperparathyroidism: What's really the difference?

Sanjana Balachandra1, Rongzhi Wang1, Ramsha Akhund1

  • 1Department of Surgery, the University of Alabama at Birmingham For the Latino Surgical, Society 2024 Meeting, United States.

American Journal of Surgery
|March 1, 2025
PubMed
Summary

Patients with normocalcemic hyperparathyroidism (HPT) present differently and have lower cure rates after parathyroidectomy compared to hypercalcemic HPT. Further research is needed to understand these outcomes.

Keywords:
HyperparathyroidismNormocalcemic hyperparathyroidism

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Establishment of a Simple and Effective Rat Model for Intraoperative Parathyroid Gland Imaging
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Establishment of a Simple and Effective Rat Model for Intraoperative Parathyroid Gland Imaging

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Last Updated: May 24, 2025

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Two Techniques to Create Hypoparathyroid Mice: Parathyroidectomy Using GFP Glands and Diphtheria-Toxin-Mediated Parathyroid Ablation
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Area of Science:

  • Endocrinology
  • Surgical Oncology
  • Neurosurgery

Background:

  • Primary hyperparathyroidism (HPT) typically involves elevated parathyroid hormone (PTH) and hypercalcemia.
  • Normocalcemic HPT presents with elevated PTH and normal calcium, posing unique diagnostic and therapeutic challenges.
  • Understanding differences between normocalcemic and hypercalcemic HPT is crucial for surgical management.

Purpose of the Study:

  • To compare demographics, presentation, and surgical outcomes of normocalcemic HPT versus hypercalcemic HPT.
  • To identify distinct clinical characteristics and risk factors associated with each HPT subtype.
  • To evaluate the efficacy of parathyroidectomy in achieving cure for both HPT forms.

Main Methods:

  • Retrospective review of 701 patients undergoing parathyroidectomy (January 2016 - June 2022).
  • Patients classified as hypercalcemic (calcium >10.4 mg/dL) or normocalcemic (calcium ≤10.4 mg/dL).
  • Cure defined by postoperative normal calcium (hypercalcemic) or normal PTH (normocalcemic) for 6 months.

Main Results:

  • Normocalcemic HPT (19.3%) presented with more kidney stones (53.3%) and higher rates of hyperplasia (43.3%) compared to hypercalcemic HPT.
  • African American patients were more likely to have hypercalcemic HPT (19.1% vs 9.6%).
  • Postoperative cure rates were lower for normocalcemic HPT (92.0%) versus hypercalcemic HPT (97.0%), with a 3% recurrence rate.

Conclusions:

  • Normocalcemic HPT patients exhibit distinct preoperative symptoms and biochemical profiles.
  • Surgical cure rates for normocalcemic HPT are significantly lower than for hypercalcemic HPT.
  • Further investigation is warranted to optimize surgical outcomes for normocalcemic HPT.