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Related Concept Videos

Pharmacodynamic Models: Linear Concentration–Effect Model01:15

Pharmacodynamic Models: Linear Concentration–Effect Model

The linear concentration–effect model, underpinned by the principle that pharmacological effect (E) is directly proportional to plasma drug concentration (C), emerges as a pivotal simplification of the Emax model for conditions where C is significantly less than EC50. This model portrays a linear trajectory of the concentration–effect relationship when drug levels are markedly below the EC50 threshold.Despite its inherent assumption of continuous effect augmentation with increasing drug...
Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers01:12

Antiarrhythmic Drugs: Class III Agents as Potassium Channel Blockers

Class III antiarrhythmic drugs are a group of medications that can prolong action potentials in the heart. They achieve this by blocking potassium channels or enhancing inward currents from sodium channels. However, these drugs have a unique property of "reverse use-dependence," which is most pronounced at slower heart rates and can lead to torsades de pointes—a specific type of arrhythmia. However, it is essential to note that excessive QT interval prolongation—a measure of the heart's...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
Pharmacokinetic–Pharmacodynamic Relationship: Duration of Dose-Effect Relationship01:14

Pharmacokinetic–Pharmacodynamic Relationship: Duration of Dose-Effect Relationship

For drugs producing a quantal response, onset occurs when plasma concentration reaches a minimum effective level (Cmin). The drug's action duration depends on how long the plasma concentration remains above Cmin.Two primary factors influence this duration: dose size and the rate of drug removal from the action site. Both depend on the drug's redistribution to poorly perfused tissues and elimination processes. A larger dose promotes rapid onset and prolongs the effect's duration.Consider a...
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...

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Related Experiment Video

Updated: Jun 1, 2026

Electrocardiogram Recordings in Anesthetized Mice using Lead II
04:16

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Published on: June 20, 2020

Prolonged corrected QT dispersion.

M Orditura1, B Sarubbi, F Devita

  • 1UNIV NAPLES,SCH MED 2,DEPT INTERNAL & EXPT MED F MAGRASSI,I-80138 NAPLES,ITALY. UNIV NAPLES,SCH MED 2,DIV MED ONCOL,CHAIR CARDIOL,I-80138 NAPLES,ITALY.

Oncology Reports
|May 19, 2011
PubMed
Summary
This summary is machine-generated.

Anthracyclines like doxorubicin can cause heart damage. This study found that doxorubicin significantly increases ventricular repolarization time indexes, indicating potential electrical instability and increased risk for heart problems in cancer patients.

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Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
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Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus

Published on: April 5, 2011

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Last Updated: Jun 1, 2026

Electrocardiogram Recordings in Anesthetized Mice using Lead II
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Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus
08:28

Methods for ECG Evaluation of Indicators of Cardiac Risk, and Susceptibility to Aconitine-induced Arrhythmias in Rats Following Status Epilepticus

Published on: April 5, 2011

Area of Science:

  • Cardiology
  • Oncology
  • Pharmacology

Background:

  • Anthracyclines are vital chemotherapy agents for various cancers.
  • Cardiotoxicity is a significant limitation to anthracycline therapy.
  • Monitoring cardiac function during anthracycline treatment is crucial but lacks definitive guidelines.

Purpose of the Study:

  • To evaluate the impact of doxorubicin on ventricular repolarization time indexes.
  • To assess if these indexes can identify electrical myocardial instability.
  • To explore the risk of arrhythmia or heart failure associated with doxorubicin treatment.

Main Methods:

  • Electrocardiographic parameters were analyzed in 27 cancer patients.
  • Measurements were taken before and after doxorubicin chemotherapy.
  • Ventricular recovery time indexes, including QTc dispersion, were compared.

Main Results:

  • A significant increase in ventricular recovery time indexes was observed after doxorubicin treatment.
  • QTc dispersion and 'Adjusted' QTc dispersion showed significant changes.
  • These findings suggest a short-term electrophysiological effect of doxorubicin.

Conclusions:

  • Doxorubicin treatment leads to significant alterations in ventricular repolarization indexes.
  • These electrophysiological changes may indicate increased risk for cardiac events.
  • Further prospective studies are needed to confirm the link between these changes and cardiotoxicity.