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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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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.
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Skeletal Muscle Relaxants: Adverse Effects01:21

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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.
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Various sedation levels offer significant advantages in facilitating procedural interventions for patients undergoing medical or invasive surgical procedures. These levels span from anxiolysis to general anesthesia, providing a spectrum of sedative effects to cater to specific patient needs. Anxiolysis reduces anxiety and is achieved through minimal sedation, enabling patients to remain awake and responsive while feeling more at ease during the procedure. This level can benefit minor...
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Depolarizing Blockers: Pharmocokinetics01:19

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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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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.
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Sedation Practices during Continuous Neuromuscular Blockade for Acute Respiratory Distress Syndrome.

Peter J Dunbar1, Ryan A Peterson2, Max McGrath2

  • 1Division of Pulmonary Sciences and Critical Care Medicine.

Annals of the American Thoracic Society
|May 9, 2025
PubMed
Summary

Propofol and opioid use during neuromuscular blockade for acute respiratory distress syndrome (ARDS) is linked to better patient outcomes. This sedation strategy improved ventilator-free days, survival, and home discharge rates compared to benzodiazepines.

Keywords:
ARDSNMBmechanical ventilationsedatives

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Area of Science:

  • Critical Care Medicine
  • Pharmacology
  • Respiratory Medicine

Background:

  • Neuromuscular blockade is common in acute respiratory distress syndrome (ARDS) to enhance ventilator synchrony.
  • Current sedation practices and their impact on ARDS patient outcomes during neuromuscular blockade are not well understood.

Purpose of the Study:

  • To analyze national sedation practices during neuromuscular blockade in ARDS patients.
  • To investigate if propofol-opioid sedation, versus benzodiazepine-opioid sedation, improves patient outcomes.

Main Methods:

  • A U.S. national database (2010-2021) of intubated, mechanically ventilated patients with ARDS or ARDS risk factors was analyzed.
  • Sedation and analgesia charges were recorded for the first two hospital days.
  • Multivariable analyses examined the association between sedation types and ventilator-free days, 28-day survival, and home discharge.

Main Results:

  • Propofol has become the primary sedative during neuromuscular blockade for ARDS, surpassing benzodiazepines.
  • Propofol-opioid use was associated with significantly increased ventilator-free days (aOR 1.38), 28-day survival (aOR 1.15), and home discharge (aOR 1.26) compared to benzodiazepine-opioids.

Conclusions:

  • Sedation practices for ARDS patients on neuromuscular blockade have shifted from benzodiazepines to propofol between 2010-2021.
  • Propofol-opioid sedation is associated with improved clinical outcomes in ARDS patients.
  • Further research is warranted to confirm these findings on sedation's impact on ARDS outcomes.