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Related Concept Videos

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...
Adrenal Gland Disorders01:27

Adrenal Gland Disorders

Adrenal gland disorders manifest when the production of adrenal hormones deviates from the norm, resulting in either excessive or insufficient concentrations.
Adrenal insufficiency, characterized by insufficient cortisol and aldosterone production, leads to conditions like Addison's disease. This disorder, affecting the adrenal cortex, exhibits symptoms such as skin bronzing, dehydration, low blood pressure, fatigue, and weight loss. Congenital adrenal hyperplasia, a genetic ailment causing...
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...
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Hormones of the Adrenal Glands

Adrenal hormones play a pivotal role in maintaining the body's electrolyte balance and orchestrating responses to stress, showcasing the intricate functions of the adrenal cortex and medulla.
The adrenal cortex, a powerhouse of hormone synthesis, generates over two dozen corticosteroid hormones. The zona glomerulosa produces mineralocorticoids, exemplified by aldosterone, influencing the electrolyte composition of body fluids. The synthesis of glucocorticoids such as cortisol and corticosterone...
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Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features of the...

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In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse
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Adrenal function in cats with hyperthyroidism.

Sabine Ramspott1, Katrin Hartmann, Carola Sauter-Louis

  • 1Clinic of Small Animal Medicine, LMU University of Munich, Veterinaerstrasse 13, Munich, Germany.

Journal of Feline Medicine and Surgery
|March 1, 2012
PubMed
Summary
This summary is machine-generated.

Hyperthyroid cats show increased cortisol levels when stimulated, indicating a higher cortisol secretory capacity. However, their adrenal glands are not permanently enlarged, suggesting temporary changes in adrenal function.

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Area of Science:

  • Veterinary Medicine
  • Endocrinology
  • Animal Physiology

Background:

  • Hyperthyroidism can affect adrenal function in animals.
  • Understanding adrenal response in hyperthyroid cats is crucial for diagnosis and management.

Purpose of the Study:

  • To compare adrenal function in hyperthyroid cats versus healthy cats and those with chronic diseases.
  • To evaluate cortisol levels, adrenal gland size, and response to adrenocorticotropic hormone (ACTH) stimulation.

Main Methods:

  • Adrenocorticotropic hormone (ACTH) stimulation tests were performed.
  • Urinary cortisol to creatinine ratio (UCCR) was measured.
  • Adrenal gland dimensions were assessed using ultrasound.

Main Results:

  • Hyperthyroid cats exhibited significantly higher cortisol levels pre- and post-ACTH stimulation compared to controls.
  • Urinary cortisol to creatinine ratio (UCCR) was not elevated in hyperthyroid cats.
  • Adrenal gland size did not significantly differ between hyperthyroid and healthy cats.

Conclusions:

  • Hyperthyroid cats demonstrate an enhanced cortisol secretory capacity in a clinical setting.
  • Normal adrenal gland size suggests that elevated cortisol levels may be transient, not indicative of permanent adrenal enlargement.