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Related Concept Videos

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.
Competitive antagonists prevent acetylcholine from binding to its receptor, inhibiting membrane depolarization. Without conformational changes or intrinsic...
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Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

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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.
Although all competitive neuromuscular blockers are designed...
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Neuromuscular Junction And Blockade01:29

Neuromuscular Junction And Blockade

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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
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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: Pharmacokinetics01:11

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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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Skeletal Muscle Relaxants: Therapeutic Uses01:31

Skeletal Muscle Relaxants: Therapeutic Uses

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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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Deep Neuromuscular Blockade Leads to a Larger Intraabdominal Volume During Laparoscopy
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[Residual neuromuscular blockade].

T Fuchs-Buder1, D Schmartz2

  • 1Département d'Anesthésie-Réanimation, CHU de Nancy, Hopitaux de Brabois, 4, Rue du Morvan, 54511, Vandoeuvres-Les-Nancy, Frankreich. t.fuchs-buder@chu-nancy.fr.

Der Anaesthesist
|June 3, 2017
PubMed
Summary
This summary is machine-generated.

Even minor residual neuromuscular blockade can cause significant patient issues, including impaired swallowing and airway function. Prompt neuromuscular monitoring and reversal are crucial to prevent these postoperative complications.

Keywords:
NeostigmineNeuromuscular monitoringPharynxSugammadexUpper airway

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Area of Science:

  • Anesthesiology
  • Pharmacology

Background:

  • Residual neuromuscular blockade (RNB) after anesthesia is a common complication.
  • Even mild RNB (train-of-four ratio >0.6) can lead to serious patient consequences.
  • RNB can impair upper airway function and swallowing post-surgery.

Purpose of the Study:

  • To highlight the clinical significance of minor residual neuromuscular blockade.
  • To emphasize the potential impact of RNB on postoperative patient outcomes.
  • To underscore the importance of neuromuscular monitoring and reversal strategies.

Main Methods:

  • Review of current evidence on residual neuromuscular blockade.
  • Analysis of consequences associated with train-of-four ratios above 0.6.
  • Discussion of incidence and duration of RNB after common neuromuscular blocking agents.

Main Results:

  • Small degrees of residual neuromuscular blockade persist long after anesthesia.
  • Impaired swallowing and upper airway integrity are linked to residual blockade.
  • Postoperative outcomes may be negatively affected by residual neuromuscular blockade.

Conclusions:

  • Neuromuscular monitoring is essential for detecting residual blockade.
  • Pharmacological reversal agents are key to preventing postoperative residual blockade.
  • Proactive management of neuromuscular blockade improves patient safety and outcomes.