Video Experimental Relacionado
Updated: Jul 18, 2026
04:16
Whole Body Vibration Methods with Survivors of Polio
Published on: October 17, 2018
Coherencia entre la activación de baja frecuencia de la corteza motora y el temblor en pacientes con temblor esencial
D M Halliday1, B A Conway, S F Farmer
1Bioengineering Unit, University of Strathclyde, Glasgow, UK.
Lancet (London, England)
|May 3, 2000
Resumen
El temblor esencial no se origina en la corteza motora primaria, a diferencia del temblor de la enfermedad de Parkinson. Este estudio no encontró ninguna correlación entre la actividad de la corteza motora y el temblor esencial, lo que sugiere que están involucradas vías alternativas.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- El control del motor es el control del motor.
- Neurología Neurología.
Sus antecedentes:
- Una corteza motora sana exhibe una activación rítmica de 15-30 Hz durante las contracciones posturales.
- El temblor de la enfermedad de Parkinson (3-6 Hz) está relacionado con la activación anormal de la corteza motora de baja frecuencia.
- El origen del temblor esencial y su relación con la actividad de la corteza motora siguen sin estar claros.
Objetivo del estudio:
- Para investigar el papel de la corteza motora en la generación del temblor esencial.
- Para determinar si el impulso motor rítmico para el temblor esencial se origina en la corteza motora primaria.
Principales métodos:
- La magnetoencefalografía (MEG) registró la actividad de la corteza motora en seis pacientes con temblor esencial.
- El electromiograma simultáneo (EMG) registró la actividad muscular de los dedos durante el temblor postural.
- El análisis espectral estadístico evaluó la coherencia magnetoencefalograma-EMG en frecuencias de temblor.
Principales resultados:
- El EMG mostró un componente de baja frecuencia en la frecuencia del temblor.
- No se encontró coherencia significativa entre el magnetoencefalograma y el EMG en la frecuencia esencial del temblor.
- La coherencia a frecuencias más altas fue similar a la de los individuos sanos.
Conclusiones:
- El temblor esencial no parece originarse en la corteza motora primaria.
- Los hallazgos sugieren que el temblor se impone a través de vías descendentes fuera de la corteza motora primaria.
- Esto desafía los modelos existentes de fisiopatología del temblor esencial y la eficacia del tratamiento.
Más Videos Relacionados
08:43Advanced Cardiac Rhythm Management by Applying Optogenetic Multi-Site Photostimulation in Murine Hearts
Published on: August 26, 2021
06:28High-Quality Seizure-Like Activity from Acute Brain Slices Using a Complementary Metal-Oxide-Semiconductor High-Density Microelectrode Array System
Published on: September 27, 2024
Videos de Conceptos Relacionados
01:17Pulse amplitude and quality
Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped.
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
01:30Pulse rhythm
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...
01:22Muscle Stimulation Frequency
The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
01:13Seizures: Classification
Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
01:29Disturbances in Heart Rhythm
Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
01:29Dysrhythmias III: Characteristics of Dysrhythmias
Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per minute.