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Related Concept Videos

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

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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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Skeletal Muscle Relaxants: Therapeutic Uses01:31

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Skeletal muscle relaxants are used to relax muscle tone and alleviate painful muscle contractions. However, the choice of skeletal muscle relaxants depends on the duration of the surgical procedure in order to minimize potential side effects. Skeletal muscle relaxants like neuromuscular blocking agents [NMBAs] are commonly employed as adjuvants alongside general anesthetics in clinical settings. NMBAs are also used to maintain controlled ventilation during surgery of the larynx or pharynx...
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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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Depolarizing Blockers: Pharmocokinetics01:19

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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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Decrease in Residual Neurological Symptoms After Institutional Changes in Peripheral Nerve Block Use for Pediatric

Amy L Xu1, R Jay Lee

  • 1Department of Orthopaedic Surgery, The Johns Hopkins University, Baltimore, MD.

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|January 7, 2022
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This summary is machine-generated.

Implementing dedicated anesthesia block teams significantly reduced peripheral nerve block (PNB) complications in pediatric knee surgery. This change led to fewer neurological symptoms, improving patient safety and outcomes.

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Area of Science:

  • Anesthesiology
  • Pediatric Surgery
  • Neurology

Background:

  • Peripheral nerve blocks (PNBs) are increasingly associated with higher complication rates than previously recognized.
  • This study investigates PNB-related residual neurological symptoms in pediatric knee surgery patients.

Purpose of the Study:

  • To compare the incidence of PNB-related neurological complications before and after changes in PNB administration at an institution.
  • To analyze differences in patient selection, operative, and anesthesia practices.

Main Methods:

  • A retrospective study compared two cohorts of pediatric knee surgery patients who received PNBs: 2014-2016 (n=100) and 2017-2019 (n=104).
  • Cohort 2 received PNBs after administration was restricted to a dedicated anesthesia block team.
  • Statistical analysis included t tests and chi-squared tests (α=0.05).

Main Results:

  • The incidence of PNB-related neurological complications decreased significantly from 6% in cohort 1 to 0.96% in cohort 2 (P=0.045).
  • Cohort 2 showed a higher proportion of female patients (57% vs. 36%) and shifts in PNB provider experience (more fellows, fewer residents).
  • The most common PNB site shifted from femoral nerve to saphenous nerve in cohort 2.

Conclusions:

  • Institutional changes, including limiting PNBs to a dedicated team and favoring more distal nerve targets, significantly reduced complication rates.
  • Increased provider experience and altered anatomical site selection may contribute to lower complication rates.
  • These findings offer strategies for other institutions to minimize PNB-related complications in pediatric patients.