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Related Concept Videos

Skeletal Muscle Relaxants: Adverse Effects01:21

Skeletal Muscle Relaxants: Adverse Effects

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Skeletal muscle relaxants are widely used for muscle paralysis and relieving pain following any muscle injury or stiffness. However, depending on the drug type, they can have adverse effects that range from mild to severe. Usually, nondepolarizing neuromuscular blockers have minimal side effects. For example, drugs like d-tubocurarine, cisatracurium, and rocuronium cause hypotension, whereas drugs like baclofen, when stopped abruptly, can lead to the recurrence of spastic conditions.
Unlike...
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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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Depolarizing Blockers: Pharmocokinetics01:19

Depolarizing Blockers: Pharmocokinetics

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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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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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Parenteral Anesthetics: Overview01:24

Parenteral Anesthetics: Overview

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Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.
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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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Related Experiment Video

Updated: Sep 16, 2025

Deep Neuromuscular Blockade Leads to a Larger Intraabdominal Volume During Laparoscopy
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Magnesium sulfate and sugammadex: implications for routine practice.

Thomas Fuchs-Buder1, Denis Schmartz2, Benoît Plaud3

  • 1Université de Lorraine, CHRU Nancy, Hôpital de Brabois, Nancy, France.

Current Opinion in Anaesthesiology
|July 9, 2025
PubMed
Summary
This summary is machine-generated.

Sugammadex effectively reverses neuromuscular blockade caused by rocuronium, even with magnesium sulfate pretreatment. It also reliably counteracts blockade recurrence after magnesium administration post-recovery.

Keywords:
magnesium sulfateneuromuscular blockaderesidual paralysissugammadex

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Area of Science:

  • Anesthesiology
  • Pharmacology
  • Neuromuscular Pharmacology

Background:

  • Magnesium sulfate (MgSO4) can prolong neuromuscular blockade induced by agents like rocuronium.
  • Administration of MgSO4 shortly after neuromuscular recovery may cause blockade recurrence.
  • Sugammadex is a reversal agent for steroidal neuromuscular blocking agents.

Purpose of the Study:

  • To assess the efficacy and safety of sugammadex in reversing neuromuscular blockade.
  • To evaluate sugammadex's role when neuromuscular blockade is affected by magnesium sulfate.
  • To determine sugammadex's effectiveness in managing recurrent neuromuscular blockade.

Main Methods:

  • Systematic review of clinical studies.
  • Analysis of sugammadex efficacy in patients pretreated with MgSO4.
  • Evaluation of sugammadex for MgSO4-induced recurrence of neuromuscular blockade.

Main Results:

  • Sugammadex dosing and timing are consistent regardless of MgSO4 pretreatment.
  • Caution is advised when administering MgSO4 after neuromuscular recovery due to potential recurrence.
  • Sugammadex effectively counteracts recurrence if blockade was induced by steroidal agents.

Conclusions:

  • Sugammadex provides rapid and reliable reversal of neuromuscular blockade in both evaluated scenarios.
  • Sugammadex is a safe and effective option for managing neuromuscular blockade influenced by magnesium sulfate.