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Related Concept Videos

Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

28
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 I: Introduction01:28

Graves' Disease I: Introduction

19
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...
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Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

20
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...
20
Antiepileptic Drugs: Calcium Channel Blockers01:17

Antiepileptic Drugs: Calcium Channel Blockers

1.7K
Calcium channel blockers, a class of antiepileptic drugs, regulate the flow of calcium ions within neurons.
Calcium channel blockers exert their antiepileptic effects by targeting T-type calcium channels, which are integral to transmitting nerve signals in the central nervous system. These channels allow the passage of calcium ions, which are vital for neuronal communication. By inhibiting T-type calcium channels, calcium channel blockers effectively reduce the release of neurotransmitters and...
1.7K
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

26
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...
26
Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

20
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,...
20

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Related Experiment Video

Updated: Apr 27, 2026

Non-restraining EEG Radiotelemetry: Epidural and Deep Intracerebral Stereotaxic EEG Electrode Placement
06:58

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Transient hypothyroidism induced by anticonvulsant agents.

Robert Krysiak, Rafal Stojko

    Neuro Endocrinology Letters
    |July 1, 2014
    PubMed
    Summary

    Antiepileptic drugs can affect thyroid function, particularly in patients with hypothyroidism. Classic anticonvulsants like carbamazepine and sodium valproate caused transient hypothyroidism, unlike gabapentin.

    Area of Science:

    • Endocrinology
    • Neurology

    Background:

    • Antiepileptic drugs (AEDs) are widely used for seizure management.
    • The impact of AEDs on thyroid function requires further investigation.

    Observation:

    • Two sisters on anticonvulsant therapy were studied.
    • One sister had pre-existing hypothyroidism and was treated with levothyroxine.

    Findings:

    • Transient hypothyroidism developed in the hypothyroid sister after treatment with carbamazepine and sodium valproate.
    • Gabapentin did not induce hypothyroidism in either sister.
    • The effect on thyroid function was dependent on the patient's hormonal status and the specific AED used.

    Implications:

    • AEDs may differentially affect thyroid function based on individual hormonal status.

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  • Clinicians should consider thyroid monitoring in hypothyroid patients receiving certain AEDs.
  • Gabapentin may represent a safer alternative regarding thyroid function impact.