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Related Concept Videos

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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Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions01:27

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

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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...
5.9K
Depolarizing Blockers: Mechanism of Action01:28

Depolarizing Blockers: Mechanism of Action

3.4K
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

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics

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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...
913
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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Related Experiment Video

Updated: Mar 24, 2026

Deep Neuromuscular Blockade Leads to a Larger Intraabdominal Volume During Laparoscopy
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Residual Neuromuscular Blockade.

Anna L Plummer-Roberts, Christina Trost, Shawn Collins

    AANA Journal
    |March 5, 2016
    PubMed
    Summary

    Nurse anesthetists should monitor neuromuscular blockade using multiple peripheral nerve stimulator settings. Administer reversal agents when the train-of-four ratio is less than 0.9 to prevent residual neuromuscular blockade.

    Area of Science:

    • Anesthesiology
    • Pharmacology
    • Critical Care Medicine

    Background:

    • Residual neuromuscular blockade is a common complication of anesthesia.
    • Incomplete reversal can lead to adverse respiratory events and prolonged recovery.
    • Understanding neuromuscular blockade pharmacology is crucial for safe patient care.

    Purpose of the Study:

    • To provide an updated review of residual neuromuscular blockade for nurse anesthetists.
    • To highlight key aspects of neuromuscular blockade management, including monitoring and reversal.
    • To offer evidence-based recommendations for preventing incomplete neuromuscular blockade reversal.

    Main Methods:

    • Review of the neuromuscular junction and neuromuscular blockade pharmacology.
    • Discussion of various monitoring sites and methods for assessing neuromuscular function.

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  • Analysis of patient implications associated with residual neuromuscular blockade.

    • Main Results:

    • Peripheral nerve stimulators are essential for monitoring neuromuscular function.
    • Using multiple settings on nerve stimulators enhances accuracy in assessing recovery.
    • A train-of-four ratio below 0.9 indicates inadequate reversal and risk of residual blockade.

    Conclusions:

    • Comprehensive understanding and application of monitoring techniques are vital.
    • Adherence to recommended train-of-four ratio thresholds improves patient safety.
    • Proactive management of neuromuscular blockade reduces the incidence and impact of residual blockade.