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Related Concept Videos

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

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Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which...
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Antihypertensive Drugs: Types of β-Blockers01:28

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β receptors are classified into three subclasses: β1, β2, and β3. β1 receptors are primarily located in the heart and kidneys. When they get activated, they increase heart rate, contractility, and renin release. This process enhances blood pressure and aids in stress management. In contrast, β2 receptors are situated mainly in the lungs, blood vessels, and skeletal muscles. Upon activation, they trigger smooth muscle relaxation, causing bronchodilation and...
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Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers01:27

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β-receptor blockers significantly impact the cardiovascular system by counteracting catecholamine-induced sympathetic responses. These medications decrease heart rate, contractility, and cardiac output, potentially leading to cardiac depression, life-threatening bradycardia, and death. Therapeutically, β-blockers function as mild antihypertensives and are utilized in treating angina pectoris and cardiac arrhythmias. However, nonselective β-blockers inhibit β2-receptors in...
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Antihypertensive Drugs: Action of β1 Blockers01:17

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β1-receptors are primarily located in the heart and kidneys. In cardiac myocytes, these receptors interact with neurotransmitters released by the sympathetic nervous system during heightened activity or danger. As a result, β1-receptors get activated, initiating a series of biochemical processes. Excessive activation of beta receptors due to chronic stress can abnormally increase heart rate and contractility, resulting in high blood pressure or hypertension. To counteract this,...
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Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

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Class I antiarrhythmic drugs are used to treat various types of arrhythmias or irregular heart rhythms. These drugs block the sodium (Na+) channels in the cardiac cells, thereby affecting the movement of electrical impulses across the heart. Class I antiarrhythmic drugs are divided into three subgroups: Class IA, Class IB, and Class IC, each with distinct mechanisms of action and effects on the heart.
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Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

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Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
Verapamil, a calcium channel blocker, inhibits calcium movement across myocardial cell membranes and vascular smooth muscle. This results in the dilation of coronary and...
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Interaction between multi-walled carbon nanotubes and propranolol.

Wenjie Nie1,2, Yani Li3,4, Leyuan Chen3

  • 1College of Geology and Environment, Xi'an University of Science and Technology, Xi'an, 710054, China. 76977485@qq.com.

Scientific Reports
|June 26, 2020
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This study investigated how beta-blockers, like propranolol, interact with multi-walled carbon nanotubes (MWCNTs) in aquatic environments. Findings reveal key adsorption mechanisms influencing pollutant fate and ecosystem health.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Analytical Chemistry

Background:

  • Carbon nanotubes (CNTs) can enter ecosystems, potentially impacting environmental and biological systems.
  • The presence of CNTs can alter the behavior and transport of pollutants in aquatic environments.

Purpose of the Study:

  • To investigate the adsorption behavior and mechanisms of beta-blockers on multi-walled carbon nanotubes (MWCNTs).
  • To explore the influence of environmental factors (pH, ionic strength, humic acid) on this adsorption process.
  • To analyze the adsorption of different drug types and elucidate underlying mechanisms.

Main Methods:

  • Adsorption experiments using propranolol (PRO) as a model beta-blocker and MWCNTs.
  • Characterization of adsorption using Zeta potential measurements.
  • Investigation of environmental factors including pH, ionic strength, and humic acid concentration.
  • Exploration of adsorption with various drug types.

Main Results:

  • Adsorption behavior of PRO on MWCNTs varied significantly with pH.
  • Environmental factors like ionic strength and humic acid influenced PRO adsorption.
  • π-π electron donor-acceptor (EDA) interactions, hydrophobic interactions, and hydrogen bonding were identified as primary adsorption mechanisms.

Conclusions:

  • MWCNTs significantly affect the adsorption of beta-blockers in aquatic systems.
  • Understanding these adsorption mechanisms is crucial for predicting pollutant fate and ecological impact.
  • Environmental factors play a critical role in modulating the interaction between MWCNTs and pharmaceuticals.