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Hypothyroidism II: Pathophysiology

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...

Graves Disease II: Pathophysiology

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...

Hyperthyroidism II: Pathophysiology

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: Introduction

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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...

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.
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Graves' Disease I: Introduction

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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...

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Related Experiment Video

Updated: May 14, 2026

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

Published on: July 14, 2023

Predictors factors for post-thyroidectomy hypocalcaemia.

Alexandre de Andrade Sousa¹, José Maria Porcaro Salles, João Marcos Arantes Soares

¹Faculty of Medicine of the Federal University of Minas Gerais, and Alfa Institute of Gastroenterology, UFMGClinics Hospital, Minas Gerais – MG, Brazil. alexandradeccp@gmail.com

Revista Do Colegio Brasileiro De Cirurgioes

|January 26, 2013

Summary

This study identified key factors predicting hypocalcemia after thyroid surgery. Age over 50, total thyroidectomy, reoperation, neck dissection, and longer operative times increase risks for temporary and permanent hypocalcemia and hypoparathyroidism.

Related Experiment Videos

Last Updated: May 14, 2026

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

Generation of Hypoparathyroid Rats via Carbon-Nanoparticle-Assisted Parathyroidectomy

Published on: July 14, 2023

Area of Science:

Endocrinology
Surgical Oncology
Neurosurgery

Background:

Post-thyroidectomy hypocalcemia and hypoparathyroidism are common complications.
Identifying predictors is crucial for patient management and risk stratification.

Purpose of the Study:

To determine the incidence of temporary and definitive hypocalcemia and hypoparathyroidism after thyroidectomy.
To identify clinical and surgical predictors associated with these complications.

Main Methods:

A cohort of 333 patients undergoing thyroidectomy was assessed.
Ionic calcium levels were monitored preoperatively and postoperatively.
Parathormone levels and various patient/surgical factors were analyzed to identify predictors.

Main Results:

The incidence of temporary hypocalcemia was 40.8%, and definitive hypoparathyroidism was 4.2%.
Factors associated with increased risk included age > 50 years, total thyroidectomy, reoperation, neck dissection, and longer operative time.
Hyperthyroidism and specific histopathological diagnoses were also linked to higher risks.

Conclusions:

Age, surgical approach (total thyroidectomy, reoperation, neck dissection), and operative time are significant predictors of postoperative hypocalcemia.
Predictors for definitive hypoparathyroidism include the type of operation, histological diagnosis, and preoperative hyperthyroidism.