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Related Experiment Videos

Identification of pseudonormal transmitral flow pattern using color Doppler echocardiography

T Imanishi1, S Nakatani, M Yamagishi

  • 1Cardiology Division of Medicine, National Cardiovascular Center, Osaka, Japan.

Japanese Circulation Journal
|October 1, 1996
PubMed
Summary

Color Doppler echocardiography can differentiate pseudonormal from normal transmitral flow patterns by assessing left ventricular (LV) compliance. The L/M ratio, reflecting LV compliance, was significantly lower in the pseudonormalization group.

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Area of Science:

  • Cardiology
  • Echocardiography
  • Medical Imaging

Background:

  • Left ventricular (LV) filling patterns are crucial for assessing diastolic function.
  • Distinguishing between normal and pseudonormal transmitral flow patterns is clinically important.
  • Conventional Doppler methods have limitations in differentiating these patterns.

Purpose of the Study:

  • To investigate the feasibility of using color Doppler echocardiography to differentiate pseudonormal from normal transmitral flow patterns.
  • To assess if jet size standardized by momentum reflects LV compliance.
  • To evaluate the utility of a novel index (L/M) in distinguishing LV diastolic function.

Main Methods:

  • 37 patients with ischemic heart disease and normal transmitral flow patterns were studied.

Related Experiment Videos

  • Patients were divided into pseudonormalization (LVEDP ≥ 18 mmHg) and normal (LVEDP < 18 mmHg) groups.
  • Color Doppler parameters (jet length L, peak velocity Av, filling volume Q) were measured during atrial contraction to calculate the L/M index.

    • Main Results:

    • The L/M index, reflecting LV compliance, was significantly lower in the pseudonormalization group compared to the normal group (1.55 ± 0.46 x 10⁻³ vs 2.72 ± 0.59 x 10⁻³; p < 0.01).
    • Conventional Doppler variables (isovolumic relaxation time, deceleration time) were insufficient for discrimination.
    • Color Doppler jet size standardized by momentum proved effective in differentiating the groups.

    Conclusions:

    • Color Doppler echocardiography during atrial contraction, using the L/M index, is a valuable tool for differentiating pseudonormal from normal transmitral flow patterns.
    • This method offers improved assessment of LV compliance compared to conventional Doppler techniques.
    • The findings suggest a novel approach to evaluating diastolic function in patients with ischemic heart disease.