Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Disorders of the Autonomic Nervous System01:18

Disorders of the Autonomic Nervous System

815
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...
815
Neural Regulation of Blood Pressure01:18

Neural Regulation of Blood Pressure

3.4K
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...
3.4K
Alterations in Blood Pressure01:30

Alterations in Blood Pressure

1.5K
Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
Hypertension (High blood pressure)
Hypertension occurs when blood pressure readings consistently exceed the normal range. It is diagnosed when systolic blood pressure (the top number, indicating pressure while the heart...
1.5K
Measurement of Blood Pressure01:17

Measurement of Blood Pressure

1.4K
Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a...
1.4K
Blood Pressure Imbalances and Circulatory Shock01:24

Blood Pressure Imbalances and Circulatory Shock

998
Disorders affecting blood volume, vascular tone, or vascular function can disrupt vascular homeostasis, including conditions like hypertension, hemorrhage, and shock.
Blood Pressure: Hypertension and Hypotension
Normal blood pressure is 120/80 mm Hg. Elevated blood pressure is 120-129/under 80 mm Hg. Hypertension, warranting treatment at 130/80 mm Hg, is often asymptomatic and can lead to severe cardiovascular events, aneurysms, peripheral arterial disease, chronic renal disease, or cardiac...
998
Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

37
Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
37

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Mesenteric blood flow and muscle sympathetic nerve activity during vasovagal syncope.

Clinical autonomic research : official journal of the Clinical Autonomic Research Society·2024
Same author

What lies beneath: cyclical giant bursts of SNA during vasovagal syncope.

Clinical autonomic research : official journal of the Clinical Autonomic Research Society·2024
Same author

Immediate effect of caffeine on sympathetic nerve activity: why coffee is safe? A single-centre crossover study.

Clinical autonomic research : official journal of the Clinical Autonomic Research Society·2023
Same author

Survival of adults with rheumatoid arthritis associated interstitial lung disease - A systematic review and meta-analysis.

Seminars in arthritis and rheumatism·2023
Same author

Sugammadex and neostigmine: when better may not be best.

Anaesthesia·2023
Same author

Care of Seniors with Breast Cancer - Treatment Received and Refining Decision Making.

Clinical oncology (Royal College of Radiologists (Great Britain))·2022

Video Experimental Relacionado

Updated: Sep 9, 2025

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
14:09

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

Published on: March 21, 2013

20.9K

Disfunción barorreflexiva progresiva y hipotensión previa al VVS: ¿un círculo vicioso?

D L Jardine1,2,3, V Stott4, C Frampton5

  • 1Department of General Medicine, Christchurch Hospital, Riccarton Rd, Christchurch, 8041, New Zealand. david.jardine@cdhb.health.nz.

Clinical autonomic research : official journal of the Clinical Autonomic Research Society
|August 30, 2025
PubMed
Resumen
Este resumen es generado por máquina.

El presíncope, el precursor del síncope vasovagal, es iniciado por una caída en la ganancia de barorreflejo simpático. Esto ocurre a pesar de la actividad simpática elevada al inicio y durante la inclinación temprana en pacientes con síncope vasovagal.

Palabras clave:
El barorreflejoActividad del nervio simpáticoLa vasodilataciónSincopio vasovagal

Más Videos Relacionados

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

5.3K
Quantitative Autonomic Testing
11:40

Quantitative Autonomic Testing

Published on: July 19, 2011

57.1K

Videos de Experimentos Relacionados

Last Updated: Sep 9, 2025

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance
14:09

Tilt Testing with Combined Lower Body Negative Pressure: a "Gold Standard" for Measuring Orthostatic Tolerance

Published on: March 21, 2013

20.9K
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

5.3K
Quantitative Autonomic Testing
11:40

Quantitative Autonomic Testing

Published on: July 19, 2011

57.1K

Área de la Ciencia:

  • Fisiología cardiovascular
  • Función del sistema nervioso autónomo
  • La neurociencia

Sus antecedentes:

  • El presíncope, caracterizado por una caída gradual de la presión arterial, precede al síncope vasovagal.
  • El control preciso de la actividad del sistema nervioso simpático durante el presíncope sigue sin estar claro.
  • La comprensión de los mecanismos de presíncope es crucial para el manejo del síncope vasovagal.

Objetivo del estudio:

  • Para aclarar el mecanismo de la presincopía, específicamente el papel de la actividad simpática.
  • Investigar los cambios en la ganancia del barorreflejo simpático y cardiovagal durante el presincopio.
  • Para diferenciar las respuestas autónomas en pacientes con síncope vasovagal en comparación con los controles sanos.

Principales métodos:

  • Análisis retrospectivo de las pruebas de inclinación en pacientes con síncope vasovagal y controles.
  • Medición de la hemodinámica y de la actividad nerviosa simpática muscular.
  • Se utilizaron métodos de secuencia para evaluar la ganancia de barorreflejo simpático y cardiovagal vascular en varias etapas (línea de base, inclinación, presincopio, recuperación).

Principales resultados:

  • Los pacientes con síncope vasovagal presentaron un aumento de la ganancia de barorreflejo simpático y cardiovagal al inicio y al inicio del estudio en comparación con los controles.
  • Durante el presíncope, la ganancia de barorreflejo simpático disminuyó significativamente, perdiendo la correlación con la presión arterial media.
  • En algunos pacientes, la actividad nerviosa simpática cayó por debajo de los niveles basales tras la recuperación (inclinación hacia atrás).

Conclusiones:

  • El presíncope parece ser desencadenado por una disminución en el aumento del barorreflejo simpático.
  • Esta disminución de la ganancia se produce a pesar de la sensibilidad barorreflexiva simpática inicialmente elevada en pacientes con síncope vasovagal.
  • Los hallazgos destacan un cambio crítico en la regulación autónoma durante la transición al síncope.