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Related Concept Videos

Antihypertensive Drugs: Action of Calcium Channel Blockers01:18

Antihypertensive Drugs: Action of Calcium Channel Blockers

Calcium ions are essential to contract smooth muscle cells in blood vessels. They enter these cells through voltage-dependent calcium channels, specifically L-type calcium channels in the cell membrane. These L-type calcium channels are integral to the excitation-contraction coupling process in smooth muscle. When a stimulus is received by smooth muscle cells, their membrane depolarizes. This alteration in membrane potential instigates the opening of L-type calcium channels. As a result,...
Antianginal Drugs: Calcium Channel Blockers and Ranolazine01:25

Antianginal Drugs: Calcium Channel Blockers and Ranolazine

Angina pectoris, a primary symptom of ischemic heart disease, requires careful pharmacological interventions. In this context, calcium channel blockers (CCBs) and ranolazine have emerged as crucial pharmacotherapeutic agents, providing deep insights into the complexities of angina management.
CCBs, a diverse class that includes dihydropyridines (nifedipine) and diphenylalkylamines (verapamil and diltiazem), exert their effect by blocking calcium channels in cardiac and smooth muscle cells. This...
Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

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...
Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
Antiepileptic Drugs: Calcium Channel Blockers01:17

Antiepileptic Drugs: Calcium Channel Blockers

Calcium channel blockers, a class of antiepileptic drugs, regulate the flow of calcium ions within neurons.
Calcium channel blockers exert their antiepileptic effects by targeting T-type calcium channels, which are integral to transmitting nerve signals in the central nervous system. These channels allow the passage of calcium ions, which are vital for neuronal communication. By inhibiting T-type calcium channels, calcium channel blockers effectively reduce the release of neurotransmitters and...
Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers01:22

Antiarrhythmic Drugs: Class I Agents as Sodium Channel Blockers

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.
Class 1A Antiarrhythmic Drugs: These drugs work by moderately blocking sodium channels,...

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Microfluidics in Assessing Platelet Function
06:47

Microfluidics in Assessing Platelet Function

Published on: November 8, 2024

Calcium-channel blockers decrease clopidogrel-mediated platelet inhibition.

Thomas Gremmel1, Sabine Steiner, Daniela Seidinger

  • 1Division of Angiology, Department of Internal Medicine II, Medical University of Vienna, Waehringer Guertel 18-20, 1090 Vienna, Austria. thomas.gremmel@meduniwien.ac.at

Heart (British Cardiac Society)
|August 19, 2009
PubMed
Summary
This summary is machine-generated.

Calcium-channel blockers (CCBs) reduce the effectiveness of clopidogrel, an antiplatelet medication. This can lead to higher risks for patients undergoing stenting procedures, impacting cardiovascular outcomes.

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Cell-based Calcium Assay for Medium to High Throughput Screening of TRP Channel Functions using FlexStation 3
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07:26

Cell-based Calcium Assay for Medium to High Throughput Screening of TRP Channel Functions using FlexStation 3

Published on: August 17, 2011

Area of Science:

  • Cardiology
  • Pharmacology

Background:

  • Clopidogrel's antiplatelet effect varies significantly among individuals.
  • Low response to clopidogrel is linked to increased adverse events post-coronary stenting.
  • Dihydropyridine calcium-channel blockers (CCBs) inhibit CYP3A4, an enzyme crucial for clopidogrel activation.

Purpose of the Study:

  • To evaluate how CCBs affect clopidogrel's ability to inhibit platelet aggregation.

Main Methods:

  • Assessed adenosine-5-diphosphate (ADP)-inducible platelet reactivity using light transmission aggregometry (LTA) and VerifyNow P2Y12 assay.
  • Included 162 patients post-percutaneous intervention with stent implantation.
  • Defined high on-treatment residual platelet reactivity as results in the fourth quartile of both assays.

Main Results:

  • Patients on CCBs exhibited significantly higher on-treatment platelet reactivity compared to those not on CCBs (p=0.001 for both assays).
  • High residual platelet reactivity was more prevalent in patients taking CCBs (p=0.001 for LTA, p=0.004 for VerifyNow P2Y12).
  • Multivariate analysis identified CCB therapy as an independent predictor of diminished clopidogrel efficacy (p=0.006 for LTA, p=0.004 for VerifyNow P2Y12).

Conclusions:

  • CCBs significantly reduce clopidogrel's antiplatelet effect in patients undergoing angioplasty and stenting.
  • This interaction may increase the risk of adverse cardiovascular events in patients treated with both medications.