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Related Concept Videos

Neural Regulation of Blood Pressure01:18

Neural 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...
Assessment of blood pressure in brachial artery(one-step method)01:15

Assessment of blood pressure in brachial artery(one-step method)

This procedural guide systematically measures blood pressure using an oscillometric digital sphygmomanometer, emphasizing accuracy, patient safety, and comfort.
Prepare for the Procedure:
Assessment of blood pressure in brachial artery(two-step method)01:23

Assessment of blood pressure in brachial artery(two-step method)

Measuring blood pressure is a fundamental skill in healthcare that aids in diagnosing and monitoring hypertension and other cardiovascular conditions. An aneroid sphygmomanometer, commonly used in clinical settings, offers a manual and precise method for blood pressure measurement. The technique for using this instrument involves specific steps that must be carefully executed to ensure accuracy. The following detailed description outlines a two-step technique for assessing blood pressure using...
Regulation of the Cardiovascular System01:27

Regulation of the Cardiovascular System

The regulation of the cardiovascular system allows the body to adapt to various demands and maintain homeostasis.
The regulation of the cardiovascular system involves the autonomic nervous system (ANS), baroreceptors, and chemoreceptors, ensuring that heart rate and blood pressure are appropriately modulated in response to varying physiological demands.
The ANS comprises two main divisions: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system enhances...
Reflex Activity01:08

Reflex Activity

A reflex activity is an automatic, involuntary response to specific stimuli. It is a part of our survival mechanism, designed to protect us from potential harm. For example, when a bright light suddenly shines into our eyes, we instinctively close them or look away. This is a simple reflex activity orchestrated by the nervous system without conscious thought or effort.
A reflex exam is a diagnostic procedure performed by a healthcare professional to evaluate the functionality of a patient's...
Sympathetic Signaling01:31

Sympathetic Signaling

Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...

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Related Experiment Video

Updated: May 22, 2026

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice
09:56

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice

Published on: February 14, 2021

[A new, spontaneous method for assessing sympathetic baroreflex function in humans].

C Gallet1, M Gujic, D Laude

  • 1Unité de neurocardiologie, université Lyon-1, 8, avenue Rockefeller, 69008 Lyon, France. clement.gallet@univ-lyon1.fr

Annales De Cardiologie Et D'Angeiologie
|May 25, 2012
PubMed
Summary

A new method accurately estimates sympathetic baroreceptor reflex sensitivity (sBRS) in humans using spontaneous nerve activity. This approach overcomes limitations of traditional methods and reveals previously unknown rapid fluctuations in sBRS.

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Novel Approach for Simultaneous Recording of Renal Sympathetic Nerve Activity and Blood Pressure with Intravenous Infusion in Conscious, Unrestrained Mice.
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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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Quantifying Acute Changes in Renal Sympathetic Nerve Activity in Response to Central Nervous System Manipulations in Anesthetized Rats

Published on: September 11, 2018

Related Experiment Videos

Last Updated: May 22, 2026

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice
09:56

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice

Published on: February 14, 2021

Novel Approach for Simultaneous Recording of Renal Sympathetic Nerve Activity and Blood Pressure with Intravenous Infusion in Conscious, Unrestrained Mice.
11:08

Novel Approach for Simultaneous Recording of Renal Sympathetic Nerve Activity and Blood Pressure with Intravenous Infusion in Conscious, Unrestrained Mice.

Published on: February 14, 2018

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

Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System
  • Baroreceptor Reflex

Context:

  • Assessing sympathetic baroreceptor reflex sensitivity (sBRS) in humans typically relies on microneurography and vasoactive drugs, methods with poor temporal resolution.
  • Existing alternative methods using spontaneous arterial pressure (AP) and muscle sympathetic nerve activity (MSNA) are difficult to interpret due to closed-loop baroreflex conditions.
  • A validated rat model utilizes renal sympathetic nerve activity (SNA) oscillations at heart rate frequency for open-loop baroreflex assessment.

Purpose:

  • To investigate the applicability of a validated rat method for assessing spontaneous sympathetic baroreceptor reflex sensitivity (sBRS) in humans.
  • To evaluate a novel method using empirical mode decomposition on spontaneous MSNA and AP recordings over short time intervals.
  • To compare spontaneous sBRS estimates with those obtained via the modified Oxford method.

Summary:

  • Spontaneous sympathetic baroreceptor reflex sensitivity (sBRS) was assessed in 16 healthy subjects using 5-minute baseline recordings of MSNA and AP.
  • The novel method, employing empirical mode decomposition, showed a significant correlation with pharmacological sBRS (R=0.67, P=0.004).
  • This approach revealed dynamic variations in sBRS, negatively correlated with AP and positively with MSNA, indicating previously unrecognized fast fluctuations.

Impact:

  • Establishes a new, non-invasive method for estimating sympathetic baroreceptor reflex sensitivity (sBRS) in humans with high temporal resolution.
  • Demonstrates the existence of rapid, previously unrecognized fluctuations in human sympathetic baroreflex function.
  • Offers a valuable tool for understanding autonomic cardiovascular regulation and its alterations in various physiological and pathological states.