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Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

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Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
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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...
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Electrophysiology of Normal Cardiac Rhythm01:19

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The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
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Cardiac Action Potential01:30

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Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
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Heart Failure Drugs: Inotropic Agents01:26

Heart Failure Drugs: Inotropic Agents

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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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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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Related Experiment Video

Updated: Nov 11, 2025

Assessment of Sarcoplasmic Reticulum Calcium Reserve and Intracellular Diastolic Calcium Removal in Isolated Ventricular Cardiomyocytes
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Oxidized CaMKII: a "heart stopper" for the sinus node?

Sabine Huke, Björn C Knollmann

    The Journal of Clinical Investigation
    |July 26, 2011
    PubMed
    Summary

    Heart failure and hypertension can cause angiotensin II to kill sinoatrial node cells. This cell death leads to electrical imbalances, contributing to heart dysfunction.

    Area of Science:

    • Cardiology
    • Molecular Biology
    • Electrophysiology

    Background:

    • The sinoatrial node (SAN) generates electrical impulses regulating normal heart rhythm.
    • SAN dysfunction contributes to heart diseases affecting millions.
    • Understanding SAN cell death mechanisms is crucial for treating heart conditions.

    Discussion:

    • Angiotensin II, elevated in heart failure and hypertension, triggers SAN cell death.
    • This process involves NADPH oxidase activation and Ca2+/calmodulin-dependent kinase II oxidation.
    • The resulting loss of SAN cells creates a "source-sink mismatch," disrupting heart electrical activity.

    Key Insights:

    • A novel molecular pathway linking angiotensin II to SAN cell death is identified.
    • This mechanism explains how common cardiovascular conditions can impair heart rhythm.

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  • The findings provide a new target for therapeutic interventions.

    • Outlook:

    • Further research can explore therapeutic strategies targeting this pathway.
    • This could lead to improved treatments for SAN dysfunction and related heart diseases.
    • Investigating the role of this mechanism in other cardiac conditions is warranted.