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Vortex formation time is not an index of ventricular function.

Ares Pasipoularides1, Pavlos P Vlachos, William C Little

  • 1Duke University School of Medicine, Durham, NC, USA, apasipou@duke.edu.

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Vortex ring formation time (FT) is not a reliable clinical index for diastolic function. New models are needed to accurately assess ventricular function by considering complex fluid dynamics and myocardial interactions.

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Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Fluid Dynamics

Background:

  • Diastolic intraventricular vortex ring formation and pinch-off dynamics are potential indicators of diastolic function.
  • The vortex ring formation time (FT) concept, derived from unconfined flow experiments, has gained popularity.
  • Existing models fail to capture the complex dynamics within the confined ventricular chamber.

Purpose of the Study:

  • To evaluate the clinical utility of vortex ring formation time (FT) as an index of diastolic function.
  • To highlight the limitations of applying unconfined flow models to intraventricular dynamics.
  • To emphasize the need for advanced models integrating hydrodynamics and myocardial mechanics.

Main Methods:

  • Review of existing hydrodynamic principles and their application to intraventricular flow.
  • Analysis of clinical and physiological findings related to diastolic function.
  • Comparison of unconfined flow conditions with the confined, dynamic environment of the ventricle.

Main Results:

  • Clinical validation studies failed to support FT as a reliable index for normal or abnormal diastolic ventricular function.
  • The dynamics within a filling ventricle, including wall relaxation and viscoelasticity, differ significantly from unconfined flow.
  • The suction effect of rebounding walls and myocardial relaxation are critical factors not accounted for in the original FT concept.

Conclusions:

  • The vortex ring formation time (FT) as originally proposed is not a clinically valid index for diastolic function.
  • Physiologically accurate models are required to understand intraventricular flow.
  • Future research should focus on coupled hydrodynamic and myocardial models to develop reliable clinical indices for diastolic function.