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Related Concept Videos

Nondepolarizing (Competitive) Neuromuscular Blockers: Mechanism of Action01:17

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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 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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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...
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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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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.
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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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Deep Neuromuscular Blockade Leads to a Larger Intraabdominal Volume During Laparoscopy
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Observational study on patterns of neuromuscular blockade reversal.

Timur Dubovoy1, Michelle Housey2, Scott Devine3

  • 1Department of Anaesthesiology, University of Michigan Medical School, CVC 4172, 1500 East Medical Centre Drive, Ann Arbour, MI, 48109, USA. tdubovoy@med.umich.edu.

BMC Anesthesiology
|October 25, 2016
PubMed
Summary

Neuromuscular blockade reversal doses were not influenced by blockade depth but were affected by patient BMI. Deeper blockade required more rescue doses, and BMI influenced both neuromuscular blockade and reversal agent administration.

Keywords:
NeostigmineNeuromuscular blockade reversalNeuromuscular blockers

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Area of Science:

  • Anesthesiology
  • Pharmacology
  • Clinical Research

Background:

  • Electronic health record data were analyzed to investigate neuromuscular blockade (NMB) reversal practices.
  • Hypothesized that deeper NMB levels would correlate with larger reversal doses.
  • Examined adherence to guidelines for ideal body weight (IBW) and total body weight (TBW) in dosing.

Purpose of the Study:

  • To determine if reversal doses correlate with neuromuscular blockade depth.
  • To assess if anesthetic drug dosing aligns with current practice guidelines.
  • To evaluate the impact of Body Mass Index (BMI) on NMB and reversal agent administration.

Main Methods:

  • Retrospective observational study of adult patients (ASA 1-4) receiving non-depolarizing NMB agents.
  • Analyzed neostigmine administration and median doses based on train-of-four (TOF) measurements.
  • Secondary analyses examined NMB and neostigmine dosing in relation to BMI categories.

Main Results:

  • No significant difference in median neostigmine dose based on TOF count (0/4 vs. 4/4).
  • Higher rates of additional neostigmine administration for deeper NMB (0/4 TOF).
  • Neostigmine doses based on TBW decreased with increasing BMI; NMB doses per IBW increased with BMI.

Conclusions:

  • Neostigmine dosing and extubation times were not affected by NMB depth.
  • Need for additional reversal correlated with NMB depth.
  • Significant BMI-related variability in dosing observed; underweight patients received higher reversal doses relative to NMB doses, and vice versa for BMI >40.