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Local Anesthetics: Clinical Application as Spinal Anesthesia01:11

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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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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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Nondepolarizing neuromuscular blockers prevent the membrane depolarization of muscle cells and inhibit muscle contraction. These are usually administered with anesthetics to achieve complete muscle relaxation. Upon administration, these drugs first block the small, rapidly contracting muscles of the face and hands, followed by the larger muscles of the trunk and the intercostal muscles. The diaphragm is the last muscle to be affected.
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Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action01:17

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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.
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Local Anesthetics: Clinical Application as Epidural Anesthesia

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.
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Paravertebral blocks.

Jacques E Chelly1

  • 1Division of Acute Interventional Perioperative Pain and Regional Anesthesia, Department of Anesthesiology, University of Pittsburgh Medical Center, Presbyterian-Shadyside Hospital, PA 15232, USA. chelje@anes.upmc.edu

Anesthesiology Clinics
|March 13, 2012
PubMed
Summary
This summary is machine-generated.

Paravertebral blocks offer an effective alternative to epidural analgesia for managing perioperative and trauma pain. Ultrasound guidance is increasingly the standard for performing these blocks, enhancing safety and precision.

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Area of Science:

  • Anesthesiology and Pain Management
  • Regional Anesthesia Techniques

Background:

  • Paravertebral blocks are a viable alternative to epidural analgesia for perioperative and trauma pain.
  • Initially used as single-shot injections for various surgeries, their application has expanded.
  • Current practice includes the use of paravertebral catheters for continuous analgesia.

Purpose of the Study:

  • To highlight the utility of paravertebral blocks as an alternative to epidural anesthesia.
  • To discuss the evolution of paravertebral block techniques, including catheter placement.
  • To emphasize the growing importance of ultrasound guidance in performing paravertebral blocks.

Main Methods:

  • Review of current practices and applications of paravertebral blocks.
  • Discussion of single-shot versus catheter techniques for paravertebral anesthesia.
  • Emphasis on the role and benefits of ultrasound-guided regional anesthesia.

Main Results:

  • Paravertebral blocks are effective for managing acute pain in surgical and trauma settings.
  • The use of paravertebral catheters (unilateral or bilateral) allows for prolonged pain management.
  • Ultrasound guidance is becoming the standard, improving the safety and accuracy of block performance.

Conclusions:

  • Paravertebral blocks are a valuable tool for pain management, offering an alternative to epidural techniques.
  • The adoption of ultrasound guidance represents a significant advancement in the safe and effective application of paravertebral blocks.
  • Continued utilization and refinement of these blocks, particularly with ultrasound, are expected.