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Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

Local Anesthetics: Differential Sensitivity of Nerve Fibers

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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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Local Anesthetics: Clinical Application as Intravenous Regional Anesthesia01:16

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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.
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Drug Delivery: Parenteral Route01:29

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The parenteral route is a critical method of drug administration. It delivers compounds directly into the systemic circulation and bypasses the gastrointestinal tract. This approach is particularly advantageous for drugs that exhibit poor absorption or instability when administered orally.
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Peripheral Nervous System: Ganglia and Nerves01:24

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The Peripheral Nervous System (PNS) is a crucial component of the body's neural network, extending beyond the central nervous system (CNS) to bridge the gap between the CNS and the external environment. It encompasses nerves, ganglia, and sensory receptors.
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Parenteral Nutrition (PN) delivers essential nutrients directly into the bloodstream, bypassing the digestive system. It is commonly used for individuals with severe digestive disorders or conditions that prevent normal nutrient absorption.
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Updated: Sep 24, 2025

Author Spotlight: Ultrasound-Guided Needle Release Combined with Corticosteroid Injection for the Treatment of Supinator Syndrome
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Peripheral Nerve Injections.

Arti Ori1, Aparna Jindal2, Nenna Nwazota3

  • 1Department of Anesthesiology and Perioperative Medicine, Pain Medicine Division, Brigham and Women's Hospital, 75 Francis Street, Boston, MA 02115, USA.

Physical Medicine and Rehabilitation Clinics of North America
|May 8, 2022
PubMed
Summary
This summary is machine-generated.

Peripheral nerve injections, guided by ultrasound and nerve stimulation, offer effective chronic pain relief. Understanding anatomy is key for interventional pain physicians to successfully manage pain conditions.

Keywords:
Chronic painInterventional pain managementNeuralgiaPeripheral nerve block

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Area of Science:

  • Pain Medicine
  • Anesthesiology
  • Neurology

Background:

  • Advancements in ultrasound and nerve stimulation have renewed interest in peripheral nerve injections for chronic pain management.
  • Peripheral nerve blocks are increasingly recognized as valuable tools in interventional pain practices.

Purpose of the Study:

  • To highlight the importance of anatomical knowledge in peripheral nerve blocks.
  • To emphasize the role of peripheral nerve injections in managing chronic pain.

Main Methods:

  • Review of current ultrasound and peripheral nerve stimulation techniques.
  • Discussion of anatomical considerations for nerve block procedures.

Main Results:

  • Accurate anatomical knowledge and understanding of nerve distribution are crucial for effective peripheral nerve blocks.
  • Peripheral nerve injections can be effectively integrated into pain management strategies.

Conclusions:

  • Peripheral nerve injections are an important component of interventional pain management.
  • Optimal patient outcomes depend on precise anatomical understanding and technique.