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Related Concept Videos

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...
401
General Anesthesia: Overview01:24

General Anesthesia: Overview

198
Anesthesia is a medical procedure that uses drugs for CNS suppression to enable painless surgeries and procedures. The selection of anesthetics is influenced by their pharmacokinetic properties, side effects, and patient characteristics. Various types of anesthesia include general, local, regional, spinal, and inhalational.
General anesthesia induces unconsciousness in the whole body, while the others target specific areas or sensations. It is administered to minimize adverse effects, maintain...
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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: Pharmacokinetics01:11

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics

437
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...
437
Neuromuscular Junction And Blockade01:29

Neuromuscular Junction And Blockade

3.0K
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...
3.0K
Depolarizing Blockers: Pharmocokinetics01:19

Depolarizing Blockers: Pharmocokinetics

315
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...
315

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Deep Neuromuscular Blockade Leads to a Larger Intraabdominal Volume During Laparoscopy
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[Update: Neuromuscular Blockade during General Anesthesia].

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    Proper use of muscle relaxants and neuromuscular monitoring is crucial in anesthesia to prevent residual neuromuscular blockades and associated complications. Guideline-based approaches significantly reduce adverse events.

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    Area of Science:

    • Anesthesiology
    • Pharmacology

    Background:

    • Muscle relaxants and neuromuscular monitoring in anesthesia are subjects of ongoing debate.
    • Residual neuromuscular blockades and their complications are critical clinical concerns.

    Purpose of the Study:

    • To discuss the correct use of muscle relaxants and neuromuscular monitoring.
    • To highlight the importance of managing residual neuromuscular blockades and avoiding complications.

    Main Methods:

    • Review of molecular mechanisms of depolarizing and non-depolarizing muscle relaxants.
    • Discussion of clinical implications, including airway management and postoperative pulmonary complications.

    Main Results:

    • The nicotinic acetylcholine receptor is a common target for muscle relaxants.
    • Succinylcholine use should be limited to exceptional cases due to its side effect profile.
    • Muscle relaxants can reduce airway management complications but increase postoperative pulmonary risks.

    Conclusions:

    • Anticipating and managing muscle relaxant-associated complications, like residual neuromuscular blockade, is essential.
    • Guideline-based strategies, including continuous neuromuscular monitoring and reversal agents, can significantly decrease adverse events.