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Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

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The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
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Hypertension IV: Drug Therapy and Lifestyle Modifications01:28

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Multiple classes of antihypertensive medications are employed in treating hypertension. The most commonly recommended first-line treatments include:Thiazide Diuretics, such as chlorthalidone, increase sodium and water excretion from the body, reducing blood volume and blood pressure.Angiotensin-converting enzyme inhibitors, like lisinopril, block the conversion of angiotensin I to II, a potent vasoconstrictor lowering blood pressure.Angiotensin II Receptor Blockers (ARBs) prevent angiotensin II...
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Antihypertensive Drugs: Angiotensin II Receptor Blockers01:30

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In the renin-angiotensin-aldosterone system, a hormone called angiotensin II plays a crucial role. It binds to the AT1 receptors in vascular smooth muscles coupled with Gq proteins. The activation of these receptors activates an enzyme called phospholipase C, which releases two molecules: inositol trisphosphate and diacylglycerol. These molecules cause a chain reaction that leads to the phosphorylation of myosin light chains and promotes interaction between actin and myosin, leading to smooth...
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Hypertension I: Introduction01:28

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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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Antihypertensive Drugs: Direct Renin Inhibitors01:25

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The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...
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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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Updated: Mar 29, 2026

Improved Renal Denervation Mitigated Hypertension Induced by Angiotensin II Infusion
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[Drug resistant hypertension].

Kazuo Eguchi

    Nihon Rinsho. Japanese Journal of Clinical Medicine
    |December 2, 2015
    PubMed
    Summary

    Resistant hypertension, uncontrolled blood pressure despite medication, requires identifying drug resistance factors. Specialists may consider device-based therapies for truly resistant cases.

    Area of Science:

    • Cardiology
    • Nephrology
    • Pharmacology

    Context:

    • Resistant hypertension affects numerous patients, posing management challenges.
    • Definition: failure to reach blood pressure below 140/90 mmHg despite three or more antihypertensive drug classes, including a diuretic.

    Purpose:

    • To review current findings on resistant hypertension.
    • To highlight factors contributing to drug resistance.
    • To guide clinical management of resistant cases.

    Summary:

    • Key factors for drug resistance include white-coat hypertension, elevating substances, inadequate drug regimens, and secondary causes like sleep apnea.
    • Accurate diagnosis of true resistance is crucial before specialist referral.
    • Device-based antihypertensive therapy is a consideration for refractory cases.

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    Impact:

    • Improved diagnostic strategies for resistant hypertension.
    • Enhanced patient management through specialist referral and advanced therapies.
    • Potential for better blood pressure control in difficult-to-treat populations.