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Neuromuscular-blocking drugs, or Neuromuscular blocking agents (NMBAs), block transmission at the neuromuscular junction, [1] causing paralysis of the affected skeletal muscles. This is accomplished via their action on the post-synaptic acetylcholine (Nm) receptors.
The neuromuscular junction. Neuromuscular drugs are chemical agents that are used to alter the transmission of nerve impulses to muscles, causing effects such as temporary paralysis of targeted skeletal muscles. Most neuromuscular drugs are available as quaternary ammonium compounds which are derived from acetylcholine (ACh). [1]
Most neuromuscular blockers function by blocking transmission at the end plate of the neuromuscular junction. Normally, a nerve impulse arrives at the motor nerve terminal, initiating an influx of calcium ions, which causes the exocytosis of synaptic vesicles containing acetylcholine. Acetylcholine then diffuses across the synaptic cleft.
Antinicotinic agents are classified into ganglionic blockers and neuromuscular blockers. Ganglionic blockers are of little clinical use as they act at all autonomic ganglions. [1] [2] They act by: Interfering acetylcholine release; Prolonged depolarization (depolarisation block), i.e. stimulation then block stimulation
Anticholinergics (anticholinergic agents) are substances that block the action of the acetylcholine (ACh) neurotransmitter at synapses in the central and peripheral nervous system. [ 1 ] [ 2 ] These agents inhibit the parasympathetic nervous system by selectively blocking the binding of ACh to its receptor in nerve cells .
Because ganglionic blockers block both the parasympathetic nervous system and sympathetic nervous system, the effect of these drugs depends upon the dominant tone in the organ system. [2] The opposite of a ganglionic blocker is referred to as a ganglionic stimulant. Some substances can exhibit both stimulating and blocking effects on autonomic ...
Pancuronium, the first aminosteroid neuromuscular blocking agent to be introduced. Aminosteroids are a group of steroids with a similar structure based on an amino - substituted steroid nucleus. [ 1 ] [ 2 ] They are neuromuscular blocking agents , acting as competitive antagonists of the nicotinic acetylcholine receptor (nAChR), and block the ...
A neuromuscular junction. Curare blocks ACh receptors (bottom left). Curare is an example of a non-depolarizing muscle relaxant that blocks the nicotinic acetylcholine receptor (nAChR), [24] one of the two types of acetylcholine (ACh) receptors, at the neuromuscular junction.