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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...

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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

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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...

Hyperthyroidism II: Pathophysiology

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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...

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The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...

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Intradermal Microdialysis: An Approach to Investigating Novel Mechanisms of Microvascular Dysfunction in Humans

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Sympathetic skin responses in patients with hyperthyroidism.

E Gozke¹, Z Ozyurt, N Dortcan

¹Department of Neurology, FSM Teaching and Research Hospital, Istanbul, Turkey. erengozke@superonline.com

Electromyography and Clinical Neurophysiology

|May 8, 2007

Summary

Sympathetic skin response (SSR) can identify sympathetic nervous system disorders in hyperthyroidism patients. This study found SSR abnormalities in the lower extremities of 18% of hyperthyroid individuals.

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Area of Science:

Endocrinology
Neurology
Physiology

Background:

Hyperthyroidism can affect the sympathetic nervous system.
Investigating these effects is crucial for patient management.

Purpose of the Study:

To evaluate sympathetic nervous system function in hyperthyroid patients.
To determine the utility of sympathetic skin response (SSR) in this assessment.

Main Methods:

Compared SSR in 22 hyperthyroid patients and 20 healthy controls.
Recorded SSR using median and tibial nerve stimulation.
Electrodes were placed on palms, soles, hands, and feet.

Main Results:

SSR was unobtainable in 18% of hyperthyroid patients' lower extremities.
Mean SSR latencies in lower extremities were significantly longer in hyperthyroid patients.
No significant difference in SSR amplitudes was observed between upper and lower extremities.

Conclusions:

Sympathetic skin response (SSR) is a valuable tool for assessing sympathetic nervous system involvement in hyperthyroidism.
Findings indicate potential peripheral sympathetic dysfunction in hyperthyroid individuals.