Related Experiment Video
Updated: Jul 3, 2026
06:30
Quantifying Acute Changes in Renal Sympathetic Nerve Activity in Response to Central Nervous System Manipulations in Anesthetized Rats
Published on: September 11, 2018
[Sympathetic response in primary hypertension]
H Benjelloun1, S Aboudrar, I Jroundi
1Service de Cardiologie A, CHU Ibn Sina, Rabat, Morocco. benjellounhalima@hotmail.com
Annales De Cardiologie Et D'Angeiologie
|August 6, 2008
Summary
Primary hypertension is linked to increased sympathetic nervous system activity and reduced parasympathetic function. This study found hypertensive patients exhibit heightened sympathetic responses and diminished parasympathetic responses compared to healthy individuals.
Area of Science:
- Cardiology
- Autonomic Neuroscience
- Hypertension Research
Context:
- Primary hypertension is a prevalent condition associated with cardiovascular disease.
- Sympathetic nervous system hyperactivity is a potential contributing factor in hypertension.
- Understanding autonomic dysfunction in hypertension is crucial for risk stratification.
Purpose:
- To evaluate sympathetic nervous system activity in patients with primary hypertension.
- To compare cardiovascular autonomic function between hypertensive and normotensive individuals.
- To assess autonomic responses using deep-breathing, hand-grip, and echostress tests.
Summary:
- Hypertensive patients (n=120) and normotensive controls (n=120) underwent autonomic function testing.
- Significant differences were observed in sympathetic responses to echostress and hand-grip tests.
- Hypertensive individuals showed reduced parasympathetic response during deep-breathing and hand-grip tests compared to controls.
Impact:
- Findings suggest a hyperactive sympathetic system and hypoactive parasympathetic system in primary hypertension.
- This research highlights the role of autonomic imbalance in the pathophysiology of hypertension.
- Results may inform the development of targeted therapeutic strategies for hypertension management.
Related Concept Videos
01:18Disorders of the Autonomic Nervous System
The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
Raynaud's disease, also known as Raynaud's phenomenon, is a...
Raynaud's disease, also known as Raynaud's phenomenon, is a...
01:18Hypertension and Regulation of Blood Pressure
Hypertension, the most common cardiovascular disease, is diagnosed through repeated measurements of elevated blood pressure. Its risks, including damage to the kidney, heart, and brain, are directly proportional to blood pressure levels. Starting from 115/75 mm Hg, the risk of cardiovascular disease doubles with each increment of 20/10 mm Hg. The diagnosis relies on blood pressure measurements, not on patient symptoms, as hypertension is often asymptomatic until end-organ damage is imminent or...
01:17Hormonal Regulation of Blood Pressure
Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...
01:29Hypertension II: Pathophysiology
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,...
01:18Neural Regulation of Blood Pressure
The neural regulation of blood pressure involves intricate interactions between the autonomic nervous system (ANS) and cardiovascular system, ensuring adequate perfusion of tissues. This regulation primarily occurs through baroreceptor and chemoreceptor reflexes, involving both short-term and long-term mechanisms.
Baroreceptor Reflex
Baroreceptors, located in the carotid sinuses and aortic arch, detect changes in blood pressure. When blood pressure rises, these stretch-sensitive receptors...
Baroreceptor Reflex
Baroreceptors, located in the carotid sinuses and aortic arch, detect changes in blood pressure. When blood pressure rises, these stretch-sensitive receptors...
01:17Antihypertensive Drugs: Action of β1 Blockers
β1-receptors are primarily located in the heart and kidneys. In cardiac myocytes, these receptors interact with neurotransmitters released by the sympathetic nervous system during heightened activity or danger. As a result, β1-receptors get activated, initiating a series of biochemical processes. Excessive activation of beta receptors due to chronic stress can abnormally increase heart rate and contractility, resulting in high blood pressure or hypertension. To counteract this, β1-blockers...