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Related Concept Videos

Bioequivalence Experimental Study Designs: Completely Randomized and Randomized Block Designs01:20

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Body:Bioequivalence experimental study designs are crucial methodologies used in evaluating and comparing the bioavailability of different drug products. These designs are categorized into various types: completely randomized, randomized block, repeated measures, cross and carry-over, and Latin square designs.Completely randomized designs involve randomly allocating treatments to all subjects participating in the experiment. This allocation is achieved by assigning unique random numbers to...
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The process of deriving the transfer function of a control system often involves reducing its block diagram to a single block. This simplification can be achieved through a series of strategic operations, including relocating branch points and comparators. These operations preserve the overall function of the system while allowing for easier manipulation and combination of blocks.
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Related Experiment Video

Updated: Feb 12, 2026

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Amiodarone-induced sinoatrial block.

B Strasberg, E Davidson, M Berand

    International Journal of Cardiology
    |June 1, 1985
    PubMed
    Summary

    Chronic amiodarone administration caused sinoatrial block in a child with heart conditions. Reducing the amiodarone dosage resolved the block, leaving only sinus bradycardia.

    Area of Science:

    • Pediatric Cardiology
    • Electrophysiology
    • Pharmacology

    Background:

    • Primary cardiomyopathy and supraventricular tachycardia are significant pediatric cardiac conditions.
    • Wolff-Parkinson-White syndrome requires careful management due to arrhythmia risks.
    • Amiodarone is a common antiarrhythmic drug used in pediatric patients.

    Observation:

    • A 5-year-old boy with pre-existing cardiomyopathy, Wolff-Parkinson-White syndrome, and supraventricular tachycardia was treated with amiodarone.
    • Chronic amiodarone administration led to the development of sinoatrial block in this patient.

    Findings:

    • Dosage reduction of amiodarone successfully reversed the sinoatrial block.
    • The patient, however, continued to exhibit asymptomatic sinus bradycardia after the dosage adjustment.

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    Methods for the Isolation, Culture, and Functional Characterization of Sinoatrial Node Myocytes from Adult Mice
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    Last Updated: Feb 12, 2026

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    Implications:

    • This case highlights the potential for amiodarone-induced sinoatrial node dysfunction in pediatric patients.
    • Careful dose titration of amiodarone is crucial for managing arrhythmias while minimizing adverse cardiac effects.
    • Understanding drug-induced conduction abnormalities is vital for optimizing treatment strategies in young patients with complex cardiac conditions.