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Related Concept Videos

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...
Hypothyroidism II: Pathophysiology01:23

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...
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...
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...
Graves' Disease I: Introduction01:28

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...
Mania and Antimanic Drugs: Overview01:24

Mania and Antimanic Drugs: Overview

Mania, a psychological condition characterized by elevated mood, increased energy, and reduced sleep need, is part of the bipolar disorder cycle. The exact cause of mania isn't entirely known, but it is thought to be a combination of genetic, environmental, and neurological factors. Bipolar disorder involves alternating manic and depressive episodes. Mood stabilizers like lithium, antipsychotics, and anticonvulsants help manage these episodes. Lithium carbonate is particularly effective as a...

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Related Experiment Videos

Lithium toxicity precipitated by profound hypothyroidism.

Brian D Phillips1, Geetha Gopalakrishnan, Reginald Gohh

  • 1Warren Alpert School of Medicine at Brown University, Division of Endocrinology, Rhode Island Hospital, Providence, Rhode Island, USA.

Thyroid : Official Journal of the American Thyroid Association
|June 27, 2008
PubMed
Summary

Thyroid cancer patients on lithium may face toxicity when thyroid hormone is withdrawn for treatment. Hypothyroidism can impair kidney function, increasing lithium levels and necessitating careful monitoring.

Related Experiment Videos

Area of Science:

  • Endocrinology
  • Nephrology
  • Pharmacology

Background:

  • Postoperative radioactive iodine ablation is common for thyroid cancer patients.
  • Thyroid hormone withdrawal is standard before radioactive iodine treatment.
  • Lithium is frequently prescribed for bipolar disorder.

Observation:

  • A woman on long-term lithium therapy developed severe lithium toxicity after 3 weeks of thyroid hormone withdrawal.
  • The patient required intensive care unit admission and hemodialysis for treatment.

Findings:

  • Hypothyroidism, induced by thyroid hormone withdrawal, likely caused renal dysfunction.
  • This renal impairment precipitated the severe lithium toxicity.
  • Hypothyroidism can negatively impact renal function and increase drug toxicity risk.

Implications:

  • Clinicians must consider the risk of lithium toxicity in hypothyroid patients.
  • Renal function monitoring is crucial for patients on lithium during thyroid hormone withdrawal.
  • This case highlights the importance of managing drug clearance in altered physiological states.