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Intraventricular Isovolumic Relaxation Flow Patterns Studied by Using Vector Flow Mapping.

Haibin Zhang1, Xiaofeng Ren1, Jin Song1

  • 1Department of Ultrasound, PLA 210th Hospital, Dalian, China.

Echocardiography (Mount Kisco, N.Y.)
|February 3, 2016
PubMed
Summary
This summary is machine-generated.

Isovolumic relaxation flow (IRF) patterns in the left ventricle (LV) correlate with LV dysfunction. A persistent large vortex during isovolumic relaxation indicates increasingly depressed LV function.

Keywords:
color Doppler flow imagingechocardiographyisovolumic relaxationvector flow mappingvortex

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Area of Science:

  • Cardiology
  • Medical Imaging
  • Fluid Dynamics

Background:

  • Left ventricular (LV) dysfunction impacts cardiac performance.
  • Characterizing flow dynamics during diastole is crucial for assessing LV function.
  • Isovolumic relaxation flow (IRF) represents diastolic filling patterns.

Purpose of the Study:

  • To characterize isovolumic relaxation flow (IRF) patterns in the left ventricle (LV).
  • To correlate IRF patterns with the spectrum of LV dysfunction in patients.

Main Methods:

  • Utilized Color Doppler flow imaging and Vector Flow Mapping.
  • Analyzed Doppler data in 61 patients with coronary artery disease, 29 with dilated cardiomyopathy, and 41 healthy controls.
  • Classified IRF patterns into three types: apical (A), bidirectional (B), and persistent vortex (C).

Main Results:

  • Healthy controls exhibited pattern A (apically directed flow).
  • Patients showed varied IRF patterns (A, B, C) significantly differing from controls in LV parameters (ejection fraction, size, wall motion, mitral annular velocities, E/e', atrial diameter).
  • Higher wall-motion score index predicted IRF pattern; in severe dysfunction, elevated E/e' predicted persistent vortex (pattern C).

Conclusions:

  • IRF patterns are significantly associated with LV function.
  • A large intraventricular vortex persisting throughout isovolumic relaxation is indicative of increasingly depressed LV function.