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Videos de Conceptos Relacionados

Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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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...
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Tension01:10

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Tension is a force along the length of a medium, in particular, a force carried by a flexible medium, such as a rope or cable. The word "tension" comes from Latin, meaning "to stretch". Not coincidentally, the flexible cords that carry muscle forces to other parts of the body are called tendons. Any flexible connector, such as a string, rope, chain, wire, or cable, can exert pull only parallel to its length; so, a force carried by a flexible connector is a tension with a...
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Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin01:26

Directly Acting Muscle Relaxants: Dantrolene and Botulinum Toxin

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Directly acting muscle relaxants like dantrolene and botulinum toxin (BoNT) have distinct mechanisms and applications. Dantrolene, a hydantoin derivative, acts on the ryanodine receptor (RYR1) in skeletal muscle cells. RYR1 are calcium channels present at the sarcoplasmic reticulum membrane. In response to excitation, they release calcium ions from the sarcoplasmic reticulum to the cytosol. Calcium promotes actin-myosin-mediated contraction of muscles.
The binding of dantrolene to the RYR1...
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Somatic Spinal Reflexes01:22

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Somatic spinal reflexes are rapid, involuntary muscular responses to external stimuli that involve the somatic musculature and the spinal cord.
One of the most well-known somatic spinal reflexes is the stretch reflex, which is activated by the sudden stretching of a muscle. This reflex involves the activation of specialized sensory receptors called muscle spindles, which are located in the muscle tissue and detect changes in the length and speed of muscle contractions. When a muscle is suddenly...
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Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

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Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action...
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Muscle Contraction01:15

Muscle Contraction

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Updated: Jan 18, 2026

An in vivo Rodent Model of Contraction-induced Injury and Non-invasive Monitoring of Recovery
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El tétanos

Önder Ergönül1, Selin Kolsuz2, J Peter Figueroa3

  • 1Koç University School of Medicine, Infectious Diseases and Clinical Microbiology, Istanbul, Türkiye; Koç University İşbank Center for Infectious Diseases, Koç University Hospital, Istanbul, Türkiye.

Lancet (London, England)
|January 16, 2026
PubMed
Resumen
Este resumen es generado por máquina.

El tétanos sigue siendo una amenaza mundial a pesar de la vacunación, causando miles de muertes al año. Las investigaciones en curso abordan los desafíos de prevención, diagnóstico y tratamiento de esta grave enfermedad infecciosa.

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Área de la Ciencia:

  • Enfermedades infecciosas
  • Inmunología
  • Salud pública

Sus antecedentes:

  • El tétanos, una infección bacteriana prevenible, todavía causa una mortalidad significativa en todo el mundo (30.000 a 50.000 muertes por año).
  • El tétanos en adultos persiste, especialmente en personas con inmunidad comprometida, diabetes o antecedentes de uso de drogas inyectables.
  • El diagnóstico actual es clínico, con tratamiento que incluye cuidado de heridas, antibióticos y antitoxinas, pero persisten preguntas críticas.

Objetivo del estudio:

  • Revisar el estado actual de la prevención, el diagnóstico y el tratamiento del tétanos.
  • Resaltar los retos persistentes y las preguntas sin respuesta en la práctica clínica y la investigación.
  • Hacer hincapié en la importancia de la vacunación, la vigilancia y las nuevas estrategias terapéuticas.

Principales métodos:

  • Revisión de la literatura y síntesis de datos de ensayos clínicos recientes.
  • Análisis de los criterios de diagnóstico y los protocolos de tratamiento actuales.
  • Examen de las tendencias epidemiológicas y de los factores de riesgo del tétanos en adultos.

Principales resultados:

  • Las antitoxinas humanas y equinas muestran una eficacia comparable, pero la disponibilidad y el costo siguen siendo problemas.
  • La inestabilidad autónoma ahora se reconoce como una manifestación temprana de la enfermedad que afecta el pronóstico.
  • Las infecciones nosocomiales complican el manejo de cuidados intensivos, aumentando la carga del paciente.

Conclusiones:

  • La vacunación sigue siendo la piedra angular de la prevención del tétanos.
  • El acceso equitativo a las vacunas y antitoxinas es crucial.
  • Para reducir la carga mundial del tétanos, es vital seguir investigando nuevas terapias y mejorar la vigilancia.