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Related Concept Videos

The Parathyroid Glands00:59

The Parathyroid Glands

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 producing...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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...
Skeleton and Calcium Homeostasis01:21

Skeleton and Calcium Homeostasis

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.
Peripheral Artery Disease I: Introduction01:30

Peripheral Artery Disease I: Introduction

Peripheral artery disease (PAD) predominantly results from atherosclerosis, which involves the accumulation of fatty deposits, or plaques, within the walls of arteries. This causes them to narrow and harden, significantly reducing blood flow. PAD predominantly affects the legs, particularly the arteries supplying the thighs and calves. In rare cases, it may involve other arteries, including those in the arms.Etiology of PAD:The principal cause of PAD is atherosclerosis, which results from fatty...

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Related Experiment Video

Updated: May 20, 2026

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy
03:57

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

Published on: July 14, 2023

Endothelial function in mild primary hyperparathyroidism.

A L Carrelli1, M D Walker, M R Di Tullio

  • 1Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.

Clinical Endocrinology
|July 5, 2012
PubMed
Summary
This summary is machine-generated.

Endothelial dysfunction is typically normal in mild primary hyperparathyroidism (PHPT) and does not improve after parathyroidectomy. However, surgery may normalize flow-mediated dilation (FMD) in patients with baseline abnormalities.

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

Published on: March 14, 2017

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Last Updated: May 20, 2026

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy
03:57

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

Published on: July 14, 2023

Two Techniques to Create Hypoparathyroid Mice: Parathyroidectomy Using GFP Glands and Diphtheria-Toxin-Mediated Parathyroid Ablation
07:13

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

Published on: March 14, 2017

Area of Science:

  • Cardiovascular Medicine
  • Endocrinology
  • Vascular Biology

Background:

  • Endothelial dysfunction is an early indicator of atherosclerosis.
  • The presence and post-surgical changes of endothelial dysfunction in mild primary hyperparathyroidism (PHPT) are not well understood.

Purpose of the Study:

  • To investigate endothelial function, measured by flow-mediated dilation (FMD), in patients with mild PHPT.
  • To determine if FMD improves after parathyroidectomy.

Main Methods:

  • Ultrasound imaging was used to measure FMD in 45 patients with mild PHPT before and 12 months after parathyroidectomy.
  • Patients' baseline FMD, serum calcium, parathyroid hormone (PTH), and 25-hydroxyvitamin D (25OHD) levels were assessed.

Main Results:

  • Baseline FMD was normal in most patients and did not correlate with calcium, PTH, or 25OHD levels.
  • Overall FMD did not change significantly 1 year after parathyroidectomy.
  • In a subgroup of 15 patients with abnormal baseline FMD, FMD normalized by 6 months post-surgery.

Conclusions:

  • Endothelial function is generally normal in mild PHPT and does not improve post-parathyroidectomy.
  • Parathyroidectomy may restore normal FMD in patients with pre-existing endothelial dysfunction.
  • Endothelial dysfunction is not a reliable indicator for parathyroidectomy in mild PHPT.