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Antihypertensive Drugs: Thiazide-Class Diuretics01:15

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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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Hypertension is a widespread, long-term medical condition where blood pressure in the arteries remains elevated. It is characterized by systolic blood pressure readings of 130 mm Hg or above or diastolic blood pressure (DBP) readings of 80 mm Hg or higher. Unmanaged hypertension poses significant health risks, making the distinction between primary (or essential) hypertension and secondary hypertension crucial, as their management and implications vary.Primary HypertensionPrimary hypertension,...
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Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
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Hypertension is asymptomatic and also referred to as the "silent killer" until it progresses to a severe stage or causes target organ disease. Patients may experience symptoms stemming from the strain on blood vessels and tissues in various organs or the heart's increased workload.Physical exams might show no abnormalities other than high blood pressure. Signs of vascular damage, when present, correspond to the organs supplied by the affected vessels, leading to target organ damage. For...
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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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Vasodilators, primarily affecting the smooth muscles within arterial and venous walls, are commonly used for hypertension treatment. Medications such as minoxidil and hydralazine primarily target arteries and arterioles, while sodium nitroprusside acts on arterioles and venules. Minoxidil, functioning as a prodrug, is metabolized by hepatic sulfotransferase into its active form, minoxidil sulfate, after oral administration. This metabolite binds to the sulfonylurea receptor (SUR) component of...
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Hydrogen sulfide in hypertension.

Harry van Goor1, Joost C van den Born, Jan-Luuk Hillebrands

  • 1aDepartment of Pathology and Medical Biology, Division of Pathology, University Medical Center Groningen, University of Groningen, Groningen bDepartment of Nephrology and Hypertension, University Medical Center Utrecht, Utrecht, the Netherlands.

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Hydrogen sulfide (H2S) has antihypertensive properties and may help regulate blood pressure. Experimental studies suggest H2S donors could be a promising therapeutic strategy for hypertension and associated cardiovascular disease.

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Area of Science:

  • Cardiovascular Research
  • Gaseous Signaling Molecules
  • Hypertension Pathophysiology

Background:

  • Hypertension is a major risk factor for cardiovascular disease.
  • Strict blood pressure control is crucial but often challenging.
  • Hydrogen sulfide (H2S) is an endogenous gas with known antihypertensive effects.

Purpose of the Study:

  • To review current research on H2S in hypertension and cardiovascular disease.
  • To explore the therapeutic potential of H2S for blood pressure regulation.

Main Methods:

  • Review of experimental studies on H2S and hypertension.
  • Analysis of H2S-producing enzymes and H2S donors.
  • Investigation of H2S metabolites like thiosulfate.

Main Results:

  • H2S plays a role in blood pressure regulation and oxidative stress.
  • Deficiency in H2S production is linked to hypertension.
  • H2S donors, including thiosulfate, demonstrate antihypertensive effects and organ protection in experimental models.

Conclusions:

  • Experimental evidence supports H2S elevation as a potential therapeutic strategy for hypertension.
  • Dietary sulfate or exogenous H2S administration may offer novel treatment options.
  • Further human studies are needed to confirm H2S efficacy in hypertensive patients.