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Related Concept Videos

Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...
Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...
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...
Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
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.
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...

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Related Experiment Video

Updated: May 16, 2026

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter
04:09

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Published on: September 20, 2024

Excessive decrease in serum magnesium after total thyroidectomy for Graves' disease is related to development of

Sara Salehi Hammerstad1, Ingrid Norheim, Trond Paulsen

  • 1The Hormone Laboratory, Oslo University Hospital-Aker, Postbox 4959, Nydalen, 0424 Oslo, Norway. sara.hammerstad@medisin.uio.no

World Journal of Surgery
|November 29, 2012
PubMed
Summary

Preoperative serum calcium and postoperative parathyroid hormone (PTH) and magnesium levels can predict permanent hypocalcemia after thyroidectomy in Graves' disease patients. Monitoring these markers aids in identifying at-risk individuals.

Related Experiment Videos

Last Updated: May 16, 2026

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter
04:09

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Published on: September 20, 2024

Area of Science:

  • Endocrinology
  • Surgical Complications
  • Metabolic Disorders

Background:

  • Transient hypocalcemia is common after thyroidectomy, while permanent hypocalcemia is rare but serious.
  • Graves' disease patients face a higher risk of permanent hypocalcemia post-thyroidectomy.
  • Understanding risk factors for permanent hypoparathyroidism is crucial for patient management.

Purpose of the Study:

  • To evaluate short-term and long-term changes in serum calcium, phosphate, magnesium, and parathyroid hormone (PTH).
  • To identify predictors of permanent hypoparathyroidism after total thyroidectomy for Graves' disease.

Main Methods:

  • Forty patients with Graves' disease undergoing total thyroidectomy were studied.
  • Serum calcium, phosphate, magnesium, and PTH levels were measured preoperatively and regularly for one year post-surgery.

Main Results:

  • 53% of patients experienced postoperative hypocalcemia; 27% had undetectable PTH 6-48 hours post-op.
  • Patients who developed permanent hypocalcemia had significantly lower preoperative serum calcium.
  • A significant correlation was found between the decrease in serum magnesium (0-48 hours post-op) and permanent hypocalcemia.

Conclusions:

  • Preoperative serum calcium, postoperative PTH, and the decrease in serum magnesium levels at 48 hours can predict permanent hypocalcemia.
  • Magnesium influences calcium homeostasis by stimulating PTH secretion and modulating PTH receptor sensitivity.
  • These findings highlight the critical role of magnesium in calcium regulation post-thyroidectomy.