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Depolarizing Blockers: Mechanism of Action

Depolarizing Blockers: Mechanism of Action

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 succinylcholine...

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.
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Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

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Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...

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...

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacological Actions

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...

Nondepolarizing (Competitive) Neuromuscular Blockers: Pharmacokinetics

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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.
Instead, they are transported by the blood to different tissues. Muscles with a greater blood supply (arteries) and blood flow receive more...

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Updated: May 17, 2026

Sterile Pericarditis in Aachener Minipigs As a Model for Atrial Myopathy and Atrial Fibrillation

Sterile Pericarditis in Aachener Minipigs As a Model for Atrial Myopathy and Atrial Fibrillation

Published on: September 24, 2021

Paliperidonium nitrate.

Jingshui Ge¹, Yang-Hui Luo

¹School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online

|November 6, 2012

Summary

This summary is machine-generated.

This study details the crystal structure of a novel molecular salt, revealing specific conformations of its piperidine and hydroxyl-bearing rings. Hydrogen bonds form a complex three-dimensional network, crucial for understanding its chemical properties.

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Acetylcholine Re-Challenge After Intracoronary Nitroglycerine Administration

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Area of Science:

Crystallography
Medicinal Chemistry
Organic Chemistry

Background:

Molecular salts are important in drug development.
Understanding crystal structures aids in predicting chemical and physical properties.
Fluorinated benzoxazole derivatives show potential in medicinal applications.

Purpose of the Study:

To elucidate the crystal structure of a specific molecular salt containing a fluorinated benzoxazole moiety.
To analyze the conformational details of the piperidine and hydroxyl-bearing rings.
To investigate the intermolecular interactions, specifically hydrogen bonding, within the crystal lattice.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the molecular structure.
Conformational analysis of the heterocyclic rings was performed.
Analysis of hydrogen bonding patterns and network formation was conducted.

Main Results:

The piperidine ring adopted a chair conformation with a protonated nitrogen atom and an axial N-H bond.
The hydroxyl-bearing ring exhibited a half-chair conformation.
Disorder was observed in the hydroxyl and adjacent methylene groups (0.823:0.177 ratio).
A 3D network was formed via O-H⋯N, O-H⋯O, N-H⋯O, and N-H⋯N hydrogen bonds.

Conclusions:

The study provides detailed structural insights into a novel molecular salt.
The observed hydrogen bonding network is key to the compound's solid-state architecture.
These findings contribute to the understanding of structure-property relationships in related chemical entities.