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Related Concept Videos

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.
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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Depolarizing Blockers: Pharmocokinetics01:19

Depolarizing Blockers: Pharmocokinetics

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Depolarizing blockers are administered through intravenous injection. Succinylcholine is the most common choice of depolarizing blockers in emergency clinical practices. Although they have a rapid onset, they readily diffuse away from the motor end plate into the extracellular fluid. They are metabolized by enzymes such as liver butyrylcholinesterase and plasma pseudocholinesterases. This produces a short duration of action, typically 5-10 minutes long, unlike nondepolarizing blockers, which...
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Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

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Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because...
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Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action01:17

Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action

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Nondepolarizing neuromuscular blockers induce paralysis by competitively blocking nicotinic acetylcholine receptors at the muscle end plate. Examples include pancuronium, mivacurium, vecuronium, and rocuronium. These quaternary ammonium derivatives are administered intravenously, are poorly absorbed, and are excreted via the kidneys.
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
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Sensory-selective Peripheral and Neuraxial Nerve Blockade with 2',6'-Pipecoloxylidide.

Claire A Ostertag-Hill1, Shuanglong Chen2, Tianrui Xue2

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A novel local anesthetic, 2',6'-pipecolylxylidine (PPX), offers sensory-selective pain relief without motor impairment. This compound demonstrates a favorable safety profile, marking a potential advancement in pain management.

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Area of Science:

  • Anesthesiology
  • Pain Management
  • Neuroscience

Background:

  • Developing safe, sensory-selective local anesthetics is crucial for managing acute and chronic pain.
  • 2",6"-pipecolylxylidine (PPX), a metabolite of amino-amide local anesthetics, is investigated for its anesthetic properties and toxicity.

Purpose of the Study:

  • To evaluate the sensory-selective local anesthetic properties of PPX.
  • To assess the toxicity profile of PPX compared to ropivacaine (ROP).

Main Methods:

  • PPX was synthesized and tested in rat models for sciatic nerve and intrathecal injections.
  • Sensory (hotplate) and motor (weight-bearing) functions were assessed, alongside clinical toxicity and conduction blockade studies.
  • Histological analysis evaluated biocompatibility.

Main Results:

  • PPX demonstrated sensory-selective nerve block at the sciatic nerve and intrathecally in rats, without motor block.
  • Higher concentrations of PPX were required in female rats, but sensory selectivity was maintained.
  • PPX showed a benign toxicity profile, with significantly higher doses tolerated compared to ropivacaine.

Conclusions:

  • PPX provides effective sensory-selective local and neuraxial anesthesia.
  • The compound exhibits a favorable safety profile, indicating its potential for pain management.
  • The unique hydrophilic-hydrophobic balance of PPX may contribute to its sensory selectivity.