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Related Experiment Videos

Left ventricular Tei index: comparison between flow and tissue Doppler analyses.

Wen-Chol Voon1, Ho-Ming Su, Hsueh-Wei Yen

  • 1Division of Cardiology, Department of Internal Medicine, Kaohsiung Medical University, Taiwan, Republic of China. wcvoon@giga.net.tw

Echocardiography (Mount Kisco, N.Y.)
|October 1, 2005
PubMed
Summary

Tissue Doppler Tei index is not a reliable substitute for flow Doppler Tei index. The flow Doppler Tei index is preload dependent, requiring consideration of loading status for myocardial performance evaluation.

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Area of Science:

  • Cardiology
  • Echocardiography
  • Cardiovascular Physiology

Background:

  • The correlation between left ventricular Tei index derived from tissue Doppler imaging (TDI) and flow Doppler (FD) waveforms remains unclear.
  • This study aimed to investigate the relationship between TDI- and FD-derived Tei indices and the impact of body position.

Purpose of the Study:

  • To evaluate the relationship between Tei index measured by tissue Doppler imaging and flow Doppler waveforms.
  • To assess the effect of body position on these measurements.

Main Methods:

  • Twenty-six healthy subjects and 25 patients with essential hypertension were enrolled.
  • Tei index was calculated using TDI by measuring the time interval from the end to the onset of the mitral annular velocity pattern during diastole and the S-wave duration.

Related Experiment Videos

Main Results:

  • A significant correlation was observed between TDI Tei index and FD Tei index in the sitting position (r = 0.406, P = 0.003), but not in the left lateral decubitus position.
  • The sitting position, associated with preload reduction, increased the Tei index in both healthy controls and hypertensive patients.
  • A similar positional effect was noted for the TDI Tei index in control subjects.

Conclusions:

  • Tissue Doppler Tei index is not a suitable substitute for flow Doppler Tei index.
  • Flow Doppler Tei index is preload dependent, necessitating consideration of loading status for accurate myocardial performance assessment.