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Updated: May 25, 2026

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[Intraoperative ejection fraction: estimation with Simpson's rule vs tissue Doppler imaging].

M C Cabrera Schulmeyer1, J Farías, J De la Maza

  • 1Departamento de Anestesiología, Universidad de Valparaíso, Hospital Clínico FACH, Santiago de Chile. carol218@vtr.net

Revista Espanola De Anestesiologia Y Reanimacion
|January 28, 2012
PubMed
Summary

Tissue Doppler imaging offers a simpler, reproducible method for estimating ejection fraction (EF) during surgery. This technique shows good correlation, especially in patients with reduced EF, aiding hemodynamic monitoring.

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Area of Science:

  • Cardiovascular Medicine
  • Anesthesiology
  • Medical Imaging

Background:

  • Transesophageal echocardiography is vital for intraoperative hemodynamic monitoring.
  • Ejection fraction (EF) is commonly estimated using Simpson's rule.
  • Tissue Doppler imaging (TDI) offers a potentially faster method for EF estimation via S-wave velocity.

Purpose of the Study:

  • To compare ejection fraction (EF) estimates derived from Simpson's rule with those obtained using intraoperative tissue Doppler measurements of S-wave velocity (S').

Main Methods:

  • Ninety-two patients with cardiovascular disease undergoing surgery were studied.
  • EF was calculated using Simpson's rule and TDI-derived S' velocity.
  • Patients were categorized into normal (≥50%) and diminished (<49%) EF groups.

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Main Results:

  • A good correlation was observed between Simpson's rule and TDI-derived EF in patients with reduced EF (<49%).
  • The correlation was lower in patients with normal EF (r=0.61).
  • Tissue Doppler imaging provided an easily obtainable and reproducible EF estimate.

Conclusions:

  • Ejection fraction (EF) can be readily estimated using tissue Doppler imaging (TDI) during surgery.
  • This TDI method is reproducible and particularly useful for patients with left ventricular dysfunction.