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Depolarizing Blockers: Mechanism of Action01:28

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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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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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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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Related Experiment Video

Updated: Aug 22, 2025

Transaxillary First Rib Resection for Treatment of the Thoracic Outlet Syndrome
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Anterior Scalene Muscle Block Response Predicts Outcomes Following Thoracic Outlet Decompression.

Austin M Beason1, Jacob A Thayer1, Norma Arras1

  • 1Southern Illinois University School of Medicine, Springfield, USA.

Hand (New York, N.Y.)
|November 7, 2022
PubMed
Summary
This summary is machine-generated.

Functional capacity testing after an anterior scalene muscle block (ASMB) can predict surgical outcomes for thoracic outlet syndrome (TOS). This diagnostic approach improves accuracy and patient expectations for neurogenic TOS treatment.

Keywords:
Baltimore Therapeutic Equipmentanterior scalene muscle blockcompressive neuropathysurgical decompressionthoracic outlet syndrome

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Area of Science:

  • Orthopedics
  • Neurosurgery
  • Physical Medicine and Rehabilitation

Background:

  • Thoracic outlet syndrome (TOS) lacks definitive objective diagnostic measures.
  • Functional capacity testing offers a potential objective assessment tool for TOS diagnosis and surgical outcome prediction.

Purpose of the Study:

  • To evaluate the utility of functional capacity testing with an anterior scalene muscle block (ASMB) in diagnosing TOS.
  • To determine if ASMB response predicts outcomes following thoracic outlet decompression (TOD).

Main Methods:

  • Retrospective review of TOS patients undergoing ASMB as a diagnostic test.
  • Measurement of functional capacity scores during standardized exercises pre-ASMB, post-ASMB, and post-TOD.
  • Correlation analysis between pre- to post-ASMB changes and pre-ASMB to post-TOD changes in functional capacity.

Main Results:

  • Significant improvements in time-to-fatigue and work product were observed post-ASMB.
  • The Extremity Abduction Stress Test showed substantial gains in both metrics post-ASMB and post-TOD.
  • Positive correlation found between functional capacity improvements after ASMB and after TOD.

Conclusions:

  • Functional capacity changes following ASMB predict objective outcomes after thoracic outlet decompression.
  • ASMB serves as a valuable diagnostic aid for TOS.
  • ASMB provides a surrogate measure for patient expectations regarding neurogenic TOS surgery.