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Related Experiment Videos

Changes in cardiac excitability and vulnerability in NMR fields.

J U Doherty, G J Whitman, M D Robinson

    Investigative Radiology
    |March 1, 1985
    PubMed
    Summary

    Magnetic resonance imaging (MRI) fields do not alter cardiac electrical properties. This study found no significant changes in ventricular refractoriness or fibrillation thresholds in rabbit hearts exposed to MRI conditions.

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    Area of Science:

    • Cardiovascular Physiology
    • Biophysics
    • Medical Imaging

    Background:

    • Nuclear Magnetic Resonance (NMR) imaging utilizes strong static magnetic fields and radiofrequency pulses.
    • Potential effects of these electromagnetic fields on cardiac electrophysiology require thorough investigation.
    • Understanding these interactions is crucial for patient safety during MRI procedures.

    Purpose of the Study:

    • To evaluate the impact of static magnetic fields and radiofrequency pulsing on ventricular excitability and vulnerability.
    • To assess alterations in ventricular refractoriness and fibrillation thresholds under NMR conditions.

    Main Methods:

    • Isolated perfused rabbit hearts were used to assess ventricular electrophysiology.
    • Strength-interval relationship was measured to determine ventricular refractoriness.

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  • Repetitive response and ventricular fibrillation thresholds were determined to assess vulnerability.
  • Experiments were conducted both inside and outside a 4.7 Tesla NMR magnet.

    • Main Results:

    • No significant differences were observed in the refractory period at various stimulation levels (threshold, midpoint, 10 mA) inside versus outside the magnetic field.
    • The repetitive response threshold showed a statistically significant increase inside the magnet (P=0.04).
    • The ventricular fibrillation threshold did not show a significant change when exposed to the magnetic field.

    Conclusions:

    • Static magnetic fields associated with radiofrequency pulsing do not measurably affect the strength-interval relationship in rabbit ventricles.
    • Ventricular vulnerability, as assessed by the repetitive response and ventricular fibrillation thresholds, is not significantly increased by exposure to NMR magnetic fields.