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While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
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Thiazide diuretics are sulfonamide derivatives featuring a benzothiadiazine ring system in their molecular structure. Based on this structure, thiazide diuretics can be categorized into two groups: thiazide-type and thiazide-like diuretics. Thiazide-type diuretics, including hydrochlorothiazide and chlorothiazide, consist of a benzothiadiazine backbone with an attached sulfonamide group. Thiazide-like diuretics, such as chlorthalidone and indapamide, lack the thiazide ring but demonstrate...
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Mania and Antimanic Drugs: Overview01:24

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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...
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Hyperthyroidism I: Introduction01:25

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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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Hyperthyroidism II: Pathophysiology01:27

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...
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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...
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Antithyroid effects of lithium.

S C Berens, R S Bernstein, J Robbins

    The Journal of Clinical Investigation
    |July 1, 1970
    PubMed
    Summary
    This summary is machine-generated.

    Lithium treatment can affect thyroid function, increasing thyroid weight and altering iodine metabolism in rats. These changes appear to be local antithyroid effects, not mediated by the pituitary gland.

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    Area of Science:

    • Endocrinology
    • Pharmacology
    • Toxicology

    Background:

    • Lithium is used to treat manic-depressive psychosis.
    • Lithium has been anecdotally reported as goitrogenic.
    • The precise effects of lithium on iodine metabolism are not fully understood.

    Purpose of the Study:

    • To investigate the effects of lithium on iodine metabolism and thyroid function in rats.
    • To determine if lithium's effects on the thyroid are direct or pituitary-mediated.

    Main Methods:

    • Male Sprague-Dawley rats were fed low iodine (LID) or normal iodine (NID) diets with lithium carbonate.
    • Serum lithium levels were maintained within or above the human therapeutic range.
    • Acute effects were studied in hypophysectomized rats receiving TSH.

    Main Results:

    • Lithium increased thyroid weight and slowed thyroidal iodine release.
    • Iodide concentration ability increased only after goiters developed.
    • Lithium decreased the proportion of (131)I in iodothyronines and increased thyroidal (127)I content.
    • Acute high-dose lithium depressed iodide uptake and release mechanisms.
    • Effects were confirmed as local antithyroid actions in hypophysectomized rats.

    Conclusions:

    • Lithium exerts local antithyroid effects, impacting iodine metabolism and thyroid weight.
    • These effects are independent of pituitary regulation (TSH).
    • Lithium's goitrogenic potential is confirmed through its influence on thyroidal iodine handling.