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Related Concept Videos

Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia01:30

Local Anesthetics: Clinical Application as Surface, Infiltration, and Conduction Block Anesthesia

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Depending on the target organ, local anesthetics (LAs) can be administered via various routes. In surface anesthesia, LAs are applied directly to the surface of the skin or mucous membranes. It is widely used for topical skin numbing before venipuncture or minor surgical procedures. Commonly used surface local anesthetics are lidocaine or benzocaine sprays or creams. Surface anesthesia occurs within 5 minutes and lasts for about 60 minutes. One of the main disadvantages of topical anesthesia is...
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Ultrasonography01:17

Ultrasonography

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
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Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia01:16

Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia

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Intravenous regional anesthesia or the Bier block technique is used to anesthetize a specific limb or extremity. It uses exsanguinated or blood-drained vessels to transport local anesthetics or LAs to the peripheral nerve trunks. Lidocaine without vasoconstrictors like epinephrine is most commonly used for this technique. Other drugs used are prilocaine, ropivacaine, and chloroprocaine. Bupivacaine is not recommended for this technique due to its high cardiac toxicity.
One of the advantages of...
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Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

Local Anesthetics: Clinical Application as Spinal Anesthesia

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Spinal anesthetics are given during lower abdomen and limb surgeries to block sensory and motor neurons. They are administered in the mid to low lumbar regions, primarily acting on the cauda equina's nerve roots. The blockade level depends on the local anesthetic (LA) concentration. Usually, low LA concentrations are sufficient to block sensory fibers, while only high LA concentrations block motor fibers. Other factors like injection volume and speed, the patient's posture, and the drug...
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Local Anesthetics: Clinical Application as Epidural Anesthesia01:29

Local Anesthetics: Clinical Application as Epidural Anesthesia

406
Epidural anesthetics are administered in the fat-filled epidural space, the outermost part of the spinal canal. This technique is commonly employed for pain management and anesthesia during lower abdomen and pelvis surgeries or labor and delivery.
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...
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Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

Local Anesthetics: Differential Sensitivity of Nerve Fibers

749
Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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Related Experiment Video

Updated: May 24, 2025

Author Spotlight: Enhancing Success of Ultrasound-Guided Neuraxial Anesthesia in Cases with Difficult Anatomy
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Myotendinous Junction Anesthesia: An Alternative Infiltration Site for Ultrasound-Guided Injections.

Julio Rosales1, Guillermo Droppelmann1,2, Nicolás García1

  • 1Clínica MEDS, Santiago, Chile.

Arthroscopy Techniques
|March 5, 2025
PubMed
Summary

Targeting the myotendinous junction for therapies like platelet-rich plasma is painful and can harm tendons. This study proposes an ultrasound-guided anesthetic block to improve pain tolerance and treatment effectiveness.

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Area of Science:

  • Musculoskeletal research
  • Regenerative medicine
  • Pain management

Background:

  • The myotendinous junction is crucial for muscle-tendon function.
  • Current tendon therapies (corticosteroids, PRP) face challenges like pain, tendon damage, and compromised cell viability.
  • Existing injection methods require improvement for better patient outcomes.

Purpose of the Study:

  • To propose a novel ultrasound-guided anesthetic block technique.
  • To enhance pain management for myotendinous junction interventions.
  • To improve the effectiveness and safety of therapies targeting the myotendinous junction.

Main Methods:

  • Development of an ultrasound-guided anesthetic block procedure.
  • Focus on precise targeting of the myotendinous junction.
  • Integration with existing therapeutic injection protocols.

Main Results:

  • The proposed technique aims to reduce pain associated with tendon injections.
  • It seeks to mitigate negative impacts on tenocyte proliferation and viability.
  • Potential for improved therapeutic efficacy by optimizing the injection site.

Conclusions:

  • Ultrasound-guided anesthetic blocks offer a promising approach for myotendinous junction treatments.
  • This method addresses key limitations of current tendon therapies.
  • Further research is warranted to validate clinical effectiveness and safety.