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Related Concept Videos

Cholinergic Antagonists: Pharmacological Actions01:28

Cholinergic Antagonists: Pharmacological Actions

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Antimuscarinic drugs block muscarinic receptors in multiple systems, including the gut, eye, smooth muscles, respiratory tract, cardiovascular, and central nervous systems. They produce similar effects with varying selectivity depending on the specific agent and tissue. Here are the key pharmacological actions of antimuscarinics:
Gastrointestinal Effects: Antimuscarinics reduce gut contractions, increase gastric emptying, and slow intestinal transit. They partly inhibit gastric acid secretion...
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Indirect-Acting Cholinergic Agonists: Pharmacological Actions01:30

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Indirect-acting cholinergic agonists, also known as anticholinesterases, exert their pharmacological effects by enhancing cholinergic transmission in various body parts, including the neuromuscular junction, autonomic cholinergic synapses, and the brain.
At the neuromuscular junction, these agents work by inhibiting the breakdown of acetylcholine, allowing it to remain bound to the receptor and bind to nearby receptors. This process leads to repetitive firing of the endplate, causing muscle...
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Direct-Acting Cholinergic Agonists: Pharmacological Actions00:59

Direct-Acting Cholinergic Agonists: Pharmacological Actions

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Direct-acting cholinergic agonists exert their pharmacological actions by mimicking the effects of acetylcholine on postsynaptic muscarinic receptors to generate parasympathetic responses. These agents elicit a range of physiological responses, including cardiovascular effects. For example, activation of muscarinic receptors induces bradycardia, decreased cardiac output, reduced peripheral resistance, and consequent hypotension. In the eye, stimulation of M3 receptors leads to smooth muscle...
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Cholinergic Antagonists: Chemistry and Structure-Activity Relationship01:29

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Cholinergic antagonists bind to cholinergic receptors and limit the effects of acetylcholine and other cholinergic agonists. Based on the specific cholinergic receptor affinity, these antagonists are classified as muscarinic or nicotinic. Anticholinergics interrupt parasympathetic innervations while sympathetic innervations remain uninterrupted. Muscarinic antagonists are also called 'muscarinic antagonists', 'antimuscarinics', or 'parasympatholytics'. Nicotinic...
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Antimuscarinic drugs have various therapeutic applications by inhibiting parasympathetic stimulation in different systems. Here are the key therapeutic uses of antimuscarinics:    
Respiratory Tract: Ipratropium, aclidinium, and tiotropium treat asthma, chronic bronchitis, and chronic obstructive pulmonary disease (COPD). They protect against bronchoconstriction caused by irritants like cigarette smoke, sulfur dioxide, and ozone. They also help reduce nasopharyngeal...
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Indirect-Acting Cholinergic Agonists: Pharmacokinetics01:22

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Indirect-acting cholinergic agonists, or anticholinesterases, enhance the body's cholinergic activity by inhibiting acetylcholine's breakdown. They are categorized as reversible or irreversible agents based on their mechanism of action. They are further classified into short-acting, intermediate-acting, and long-acting agents based on their duration of action.
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A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development
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Anticholinergic activity in the nervous system: Consequences for visuomotor function.

Preshanta Naicker1, Shailendra Anoopkumar-Dukie1, Gary D Grant1

  • 1Menzies Health Institute Queensland, Griffith University, Gold Coast, Queensland, Australia; School of Pharmacy, Griffith University, Gold Coast, Queensland, Australia.

Physiology & Behavior
|December 15, 2016
PubMed
Summary
This summary is machine-generated.

Anticholinergic medications, despite known side effects, significantly impact fine motor control and visuomotor processes in healthy individuals. This review details their effects on eye movements and pupil dynamics.

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Area of Science:

  • Neuroscience
  • Pharmacology

Background:

  • Acetylcholine plays crucial roles in both peripheral and central nervous systems.
  • Muscarinic receptor interactions with acetylcholine can lead to adverse effects like dry mouth, drowsiness, and cognitive dysfunction.

Purpose of the Study:

  • To review how anticholinergic medications affect central motor processes and fine motor control in healthy individuals.
  • To explore the influence of cholinergic neurotransmission interference on visuomotor performance.

Main Methods:

  • Review of existing literature on acetylcholine receptor function and neurotransmitter interactions.
  • Analysis of how anticholinergic medications impact specific visuomotor functions.

Main Results:

  • Anticholinergic medications interfere with critical visuomotor processes.
  • Specific effects on fixation stability, saccadic eye movements, smooth pursuit, and pupil dynamics are examined.

Conclusions:

  • Understanding the impact of anticholinergic drugs on motor control is essential.
  • Further research is needed to fully elucidate the mechanisms of anticholinergic effects on visuomotor performance.