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Related Experiment Video

Updated: Oct 10, 2025

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Effect of Shock Vector Orientation in Modulating and Terminating Rotors - a Simulation Study.

Nikhil Valsan Kulangareth, Karthikeyan Umapathy

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    |December 11, 2021
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    Summary

    Defibrillation is key for out-of-hospital cardiac arrests. Computational models show directing shock vectors perpendicular to arrhythmia rotors can terminate them with less energy, improving survival chances.

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    Area of Science:

    • Computational electrocardiology
    • Cardiac electrophysiology modeling

    Background:

    • Out-of-hospital cardiac arrest (OHCA) survival rates remain critically low.
    • Ventricular fibrillation (VF) is a primary cause of OHCA, with defibrillation as the main treatment.
    • Rotors are implicated as arrhythmia sources, but direct ablation is impractical in OHCA.

    Purpose of the Study:

    • To investigate the impact of shock vector orientation on modulating or terminating cardiac rotors using computational modeling.
    • To determine if non-invasive rotor localization can guide defibrillation strategies for improved efficacy.

    Main Methods:

    • Utilized a combination of Sovilj's and Aliev Panfilov's monodomain cardiac models.
    • Simulated rotor induction and tested the effects of shock vector magnitude and direction.
    • Conducted an average of four experimental trials per simulation condition.

    Main Results:

    • A shock vector oriented perpendicular to the rotor axis terminated rotors with 16% less magnitude compared to a parallel orientation.
    • Perpendicular shock vectors were 38% more effective than oblique orientations in terminating rotors.
    • Lower energy requirements were observed when shock vectors were aligned perpendicularly to rotor axes.

    Conclusions:

    • Rotor localization-dependent defibrillation strategies show promise for improving OHCA survival rates.
    • Optimizing shock vector orientation is a viable approach to enhance defibrillation efficacy.
    • Computational modeling provides insights into non-invasive strategies for modulating cardiac arrhythmias.