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Related Concept Videos

Antihypertensive Drugs: Thiazide-Class Diuretics01:15

Antihypertensive Drugs: Thiazide-Class Diuretics

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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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Antihypertensive Drugs: Potassium-Sparing Diuretics01:28

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Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
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Heart Failure Drugs: Diuretics01:22

Heart Failure Drugs: Diuretics

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Heart failure and kidney perfusion are interconnected in a complex way. Reduced renal perfusion and venous congestion are two significant factors that contribute to renal dysfunction in heart failure. The kidneys, primarily responsible for fluid balance in the body, are adversely affected due to compromised cardiac output and increased venous pressure. In response to reduced renal perfusion, the kidneys activate neurohumoral mechanisms to restore balance. However, these mechanisms can be...
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Regulation of Water Intake01:25

Regulation of Water Intake

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Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
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Antihypertensive Drugs: Action of Diuretics01:16

Antihypertensive Drugs: Action of Diuretics

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Diuretics are antihypertensive drugs used to treat hypertension resulting from sodium and water retention. Sodium, vital for fluid balance and nerve or muscle function, is regulated by the kidneys through millions of nephrons. Blood enters nephrons via afferent arterioles, which branch into capillaries called glomeruli. These filter blood plasma, allowing water and solutes, like sodium ions, to pass through capillary walls into Bowman's capsule. The filtrate then flows through various...
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Disorder of Water Balance01:29

Disorder of Water Balance

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Water balance disorders are medical conditions that occur when there is a deviation from the body's water volume or osmolarity, disrupting normal homeostasis and leading todehydration, hypotonic hydration, hyperhydration, edema, or water intoxication.
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
Causes:
The major causes of dehydration include excessive sweating, fever, vomiting, diarrhea, and diuresis.
Signs and Symptoms:
Symptoms primarily include intense...
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Thiazide-induced hyponatremia.

Sebastian B Beckmann1, Crissy F Rudolphi1, Pedro H Imenez Silva1

  • 1Department of Internal Medicine, Division of Nephrology and Transplantation, Erasmus MC, University Medical Centre Rotterdam, Rotterdam, the Netherlands.

Best Practice & Research. Clinical Endocrinology & Metabolism
|October 23, 2025
PubMed
Summary
This summary is machine-generated.

Thiazide-induced hyponatremia (TIH) is a common adverse effect of these blood pressure drugs. Management involves stopping the thiazide, restricting fluids, and replenishing solutes.

Keywords:
arginine vasopressindiureticselectrolytesepidemiologyprostaglandinsodium-chloride cotransporter

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Area of Science:

  • Nephrology
  • Pharmacology
  • Internal Medicine

Background:

  • Thiazide diuretics are common antihypertensives.
  • Thiazide-induced hyponatremia (TIH) is an underrecognized adverse effect.
  • TIH presents with varied neurological symptoms based on onset.

Purpose of the Study:

  • To review current understanding of TIH epidemiology.
  • To discuss clinical presentation and diagnostic criteria for TIH.
  • To outline management strategies for acute and chronic TIH.

Main Methods:

  • Literature review of thiazide-induced hyponatremia.
  • Analysis of clinical presentations and proposed mechanisms.
  • Synthesis of diagnostic and management guidelines.

Main Results:

  • TIH is idiosyncratic, more prevalent in older adults and those with specific risk factors.
  • Mechanisms may involve electrolyte depletion, altered water balance, and prostaglandin E2.
  • Management strategies differ for acute versus chronic TIH.

Conclusions:

  • TIH requires prompt recognition and tailored management.
  • Understanding thiazide targets may predict therapeutic and adverse effects.
  • Further research into renal and extra-renal thiazide actions is warranted.