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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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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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The kidneys are vital organs responsible for filtering and cleaning blood, removing waste products, and regulating electrolyte levels. To perform these essential functions, they require a constant and robust blood supply.
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DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
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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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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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Related Experiment Video

Updated: Mar 12, 2026

Improved Renal Denervation Mitigated Hypertension Induced by Angiotensin II Infusion
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Renal Denervation.

Mohammed Awais Hameed1, Indranil Dasgupta2

  • 1Department of Nephrology, Heartlands Hospital, Birmingham, UK.

Advances in Experimental Medicine and Biology
|November 6, 2016
PubMed
Summary

Renal sympathetic denervation, a procedure to treat resistant hypertension by targeting kidney nerves, showed initial promise but failed in a key trial. Future studies must address flaws to determine its true role.

Keywords:
Global Simplicity RegistryRenal angiographyRenal vascular resistanceResistant hypertensionSimplicity HTN-3Sympathetic nervous system

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Quantifying Acute Changes in Renal Sympathetic Nerve Activity in Response to Central Nervous System Manipulations in Anesthetized Rats
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Area of Science:

  • Nephrology
  • Cardiovascular Medicine
  • Interventional Cardiology

Background:

  • Sympathetic nervous system over-activity contributes to hypertension.
  • Renal sympathetic nerves are implicated in blood pressure regulation.
  • Renal denervation emerged as a treatment for resistant hypertension.

Purpose of the Study:

  • To critically analyze the role of renal sympathetic denervation in resistant hypertension.
  • To evaluate the outcomes of previous clinical trials, including a pivotal sham-controlled study.
  • To identify lessons learned for future research in renal denervation therapy.

Main Methods:

  • Review of physiological principles and surgical precedent for renal denervation.
  • Analysis of early observational studies and a subsequent randomized controlled trial (RCT).
  • Critical appraisal of methodological flaws in the sham-controlled RCT.

Main Results:

  • Initial studies suggested positive outcomes for renal denervation in resistant hypertension.
  • A major sham-controlled RCT failed to demonstrate significant benefit, leading to widespread discontinuation.
  • Analysis revealed potential flaws in the sham-controlled study design and execution.

Conclusions:

  • The efficacy of renal denervation for resistant hypertension remains uncertain due to conflicting evidence.
  • Methodological improvements are crucial for future trials to accurately assess renal denervation's therapeutic value.
  • Further well-designed studies are needed before widespread clinical adoption can be reconsidered.