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Related Concept Videos

Antihypertensive Drugs: Action of Calcium Channel Blockers01:18

Antihypertensive Drugs: Action of Calcium Channel Blockers

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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,...
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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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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.
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Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

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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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Antiepileptic Drugs: Calcium Channel Blockers01:17

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Calcium channel blockers, a class of antiepileptic drugs, regulate the flow of calcium ions within neurons.
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Heart Failure Drugs: Inotropic Agents01:26

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Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
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Related Experiment Video

Updated: Jun 12, 2025

High-Throughput Optical Controlling and Recording Calcium Signal in iPSC-Derived Cardiomyocytes for Toxicity Testing and Phenotypic Drug Screening
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Calcium channel blocker overdose: Not all the same toxicity.

Geoffrey K Isbister1,2, Shane Jenkins1, Keith Harris3,4

  • 1Clinical Toxicology Research Group, University of Newcastle, Newcastle, Australia.

British Journal of Clinical Pharmacology
|September 21, 2024
PubMed
Summary
This summary is machine-generated.

Dihydropyridine calcium channel blocker (CCB) overdoses are increasing, with amlodipine being most common. Diltiazem and verapamil overdoses present more severe toxicity and require different treatments compared to dihydropyridines.

Keywords:
amlodipinecalcium channel blockerdihydropyridinesinotropesoverdose

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Area of Science:

  • Cardiology
  • Toxicology
  • Pharmacology

Background:

  • Calcium channel blockers (CCBs) are widely prescribed for cardiovascular conditions.
  • Overdoses of CCBs, particularly dihydropyridines, represent a significant toxicological challenge.
  • Understanding the comparative severity and management of different CCB overdoses is crucial for clinical practice.

Purpose of the Study:

  • To compare the severity and treatment strategies for overdoses involving different classes of calcium channel blockers.
  • To analyze trends in CCB overdose presentations, focusing on the increasing use of dihydropyridines.

Main Methods:

  • A retrospective review of 236 CCB overdoses presenting to two toxicology services between 2014 and 2023.
  • Data extraction from a clinical database, including patient demographics, ingested dose, co-ingestants, clinical complications, treatments administered, and patient outcomes.
  • Comparative analysis of different CCB agents, with a focus on dihydropyridines versus non-dihydropyridines (diltiazem, verapamil).

Main Results:

  • Dihydropyridine overdoses significantly increased over the study period, with amlodipine being the most frequent agent (147 cases).
  • Diltiazem and verapamil overdoses were associated with more frequent intensive care unit admissions, dysrhythmias, and a longer length of hospital stay compared to dihydropyridines.
  • Hypotension was common across CCB overdoses, with varied use of inotropes, vasopressors, high-dose insulin, and calcium, differing between dihydropyridine and non-dihydropyridine ingestions. Seven deaths (3%) occurred.

Conclusions:

  • Dihydropyridines, especially amlodipine, are now the most common agents in CCB overdoses.
  • Overdoses of diltiazem and verapamil are associated with more severe toxicity and distinct management requirements compared to dihydropyridines.
  • Clinical management should be tailored based on the specific CCB agent involved in the overdose to optimize patient outcomes.