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Related Experiment Videos

Myocardial contraction maps using tissue Doppler acceleration imaging.

L Yin1, M Belohlavek, D L Packer

  • 1Division of Cardiovascular Diseases and Internal Medicine, Mayo Clinic, Mayo Foundation, Rochester, Minnesota, USA. yinlixue@yahoo.com

Chinese Medical Journal
|January 5, 2002
PubMed
Summary
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Tissue Doppler acceleration imaging (TDAI) can pinpoint the origin of heart muscle contractions following electrical pacing. This method accurately identifies the intramural site of initial myocardial acceleration, aiding in understanding cardiac electrical stimulation effects.

Area of Science:

  • Cardiovascular imaging
  • Myocardial electrophysiology
  • Cardiac mechanics

Background:

  • Determining the precise origin of myocardial contraction is crucial for understanding cardiac electrical activity.
  • Tissue Doppler imaging (TDI) offers insights into myocardial motion, but its application in mapping intramural electrical stimulation effects requires further evaluation.

Purpose of the Study:

  • To assess the utility of tissue Doppler acceleration imaging (TDAI) in identifying the intramural origin of myocardial contraction after electrical stimulation.
  • To correlate TDAI-derived acceleration patterns with the location of electrical pacing.

Main Methods:

  • Six open-chest pigs underwent left ventricle (LV) pacing with an intramural electrode.
  • Epicardial surface scanning and TDAI were employed to acquire short-axis views of the LV.

Related Experiment Videos

  • Myocardial acceleration onset and spatial distribution were analyzed in response to electrical stimulation.

    • Main Results:

    • Intramural myocardial acceleration initiated within 33 ms of electrical stimulation, consistently surrounding the pacing needle's subendocardial tip.
    • The area of initial myocardial acceleration measured 2.9–5.0 mm in short-axis diameter (mean 4.2 ± 0.9 mm).
    • TDAI visualized the initial intramural myocardial contraction, though the spatial extent and magnitude of acceleration were variable.

    Conclusions:

    • Two-dimensional myocardial acceleration mapping effectively visualizes the intramural origin of contraction following electrical pacing.
    • The observed myocardial acceleration sites corresponded accurately with the initial electrical stimulation points.
    • The 33 ms delay to peak contraction was influenced by the image acquisition frame rate.