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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

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...

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...

Graves' Disease I: Introduction

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...

Goiter

Goiter

Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...

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...

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Severe transient left ventricular dysfunction induced by thyrotoxicosis.

¹, Nilda Pintostraat #29, 1103, MK, Amsterdam, the Netherlands, bird.e@zaansmc.nl.

Netherlands Heart Journal : Monthly Journal of the Netherlands Society of Cardiology and the Netherlands Heart Foundation

|May 4, 2011

Summary

This summary is machine-generated.

Thyrotoxicosis can mimic stress-induced cardiomyopathy, causing temporary left ventricular dysfunction. Prompt medical treatment for the thyroid condition led to a full recovery of heart function in a patient presenting with chest pain.

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Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Minimal Invasive Resection of Large Retrosternal Thyroid Goiter

Published on: September 20, 2024

Area of Science:

Cardiology
Endocrinology
Internal Medicine

Background:

Thyrotoxicosis, a condition of excess thyroid hormone, can present with diverse symptoms.
Thyroid storm and severe thyrotoxicosis are associated with cardiovascular complications.
Stress-induced cardiomyopathy, or Takotsubo cardiomyopathy, is characterized by transient left ventricular dysfunction.

Purpose of the Study:

To report a case of thyrotoxicosis-induced transient left ventricular dysfunction mimicking stress-induced cardiomyopathy.
To highlight the importance of considering endocrine disorders in the differential diagnosis of cardiomyopathy.
To demonstrate the reversibility of cardiac dysfunction with appropriate medical management.

Main Methods:

Case report of a 44-year-old woman with chest pain and dyspnea.
Echocardiography to assess left ventricular function and wall motion.
Laboratory investigations for cardiac markers and thyroid function.
Monitoring of cardiac function during medical treatment for thyrotoxicosis.

Main Results:

Echocardiography revealed severe left ventricular dysfunction and wall motion abnormalities consistent with stress-induced cardiomyopathy.
Laboratory results indicated thyrotoxicosis and elevated cardiac markers.
Complete restoration of left ventricular function was observed six days after initiating medical treatment for thyrotoxicosis.

Conclusions:

Transient left ventricular dysfunction can be precipitated by thyrotoxicosis.
The cardiac presentation can closely resemble stress-induced cardiomyopathy (Takotsubo).
Medical treatment of the underlying thyrotoxicosis resulted in complete resolution of cardiac dysfunction.