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Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action01:17

Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action

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...
Skeletal Muscle Relaxants: Therapeutic Uses01:31

Skeletal Muscle Relaxants: Therapeutic Uses

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 as...
Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

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 succinylcholine...
Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

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.
Although all competitive neuromuscular blockers are designed...
Depolarizing Blockers: Pharmocokinetics01:19

Depolarizing Blockers: Pharmocokinetics

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...
Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics01:11

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics

All neuromuscular blocking agents are injected intravenously because they are poorly absorbed from the GI tract. Rapid onset is achieved with intravenous administration, although absorption is also adequate from an intramuscular injection. Since these agents are highly ionized, they do not readily penetrate cell membranes or cross the blood-brain barrier.
Instead, they are transported by the blood to different tissues. Muscles with a greater blood supply (arteries) and blood flow receive more...

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Rocuronium-induced withdrawal movements associated with different Rocuronium injection method.

Seung-Hoon Baek1, Chul-Min Woo, Hyeon-Jeong Lee

  • 1Department of Anesthesia and Pain Medicine, School of Medicine, Pusan National University, Busan, Korea.

Paediatric Anaesthesia
|March 4, 2008
PubMed
Summary

Infusing rocuronium (a muscle relaxant) significantly reduces withdrawal movements during tracheal intubation in children. This method is as effective as bolus injection for intubation and muscle relaxation, offering a more comfortable experience.

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Area of Science:

  • Anesthesiology
  • Pediatric Anesthesia
  • Pharmacology

Background:

  • Rocuronium bolus injections commonly cause pain and withdrawal movements in pediatric patients.
  • Minimizing patient discomfort during anesthesia induction is a key clinical goal.

Purpose of the Study:

  • To compare the incidence and intensity of rocuronium-induced withdrawal movements between intravenous bolus and infusion injections in children.
  • To evaluate the impact of different rocuronium administration methods on intubating conditions and muscle relaxation onset.

Main Methods:

  • 120 pediatric patients (3-15 years) were randomized into four groups receiving either bolus or infusion rocuronium (0.6 or 0.9 mg/kg).
  • Withdrawal movements were assessed using a 4-grade scale, and intubating conditions were evaluated.
  • Rocuronium-induced muscle relaxation time was measured via single twitch stimulation.

Main Results:

  • Infusion administration significantly reduced both the incidence (33.3% vs. 100%) and intensity of withdrawal movements compared to bolus injection (P < 0.05).
  • All groups achieved clinically acceptable to excellent intubating conditions.
  • No significant differences in muscle relaxation duration were observed between bolus and infusion groups.

Conclusions:

  • Infusion rocuronium effectively reduces injection-related withdrawal movements in children undergoing tracheal intubation.
  • Rocuronium infusion does not compromise intubating conditions or delay the onset of muscle relaxation.
  • Infusion administration represents a more comfortable alternative for rocuronium delivery in pediatric anesthesia.