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Intraventricular vortex properties in nonischemic dilated cardiomyopathy

Javier Bermejo1, Yolanda Benito, Marta Alhama

  • 1Department of Cardiology, Hospital General Universitario Gregorio Marañón, Facultad de Medicina, Universidad Complutense de Madrid, and Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain;

American Journal of Physiology. Heart and Circulatory Physiology
|January 14, 2014
PubMed

Insights

Vortices in the left ventricle (LV) are larger and stronger in patients with nonischemic dilated cardiomyopathy (NIDCM). These enlarged vortices help improve blood flow and transport within the remodeled heart chambers.

Area of Science:

  • Cardiovascular Physiology
  • Medical Imaging
  • Hemodynamics

Background:

  • Left ventricular (LV) vortices play a role in mechanical efficiency and blood mixing.
  • Understanding vortex dynamics is crucial for assessing cardiac function, particularly in conditions like nonischemic dilated cardiomyopathy (NIDCM).

Purpose of the Study:

  • To characterize the size, position, circulation, and kinetic energy (KE) of LV main vortex cores in NIDCM patients.
  • To analyze the physiological correlates of these vortex features.
  • To compare vortex characteristics between NIDCM patients and healthy controls.

Main Methods:

  • Digital processing of color-Doppler images to analyze flow evolution.
  • Study included 61 patients with NIDCM and 61 age-matched controls.
  • Vortex features were analyzed over the cardiac cycle, with particular attention to diastolic filling phases.

Main Results:

  • LV vortex features exhibited a biphasic temporal course during diastole, with peak KE occurring at the A wave, storing significant inflow energy.
  • Patients with NIDCM demonstrated larger and stronger vortices (increased circulation and KE) compared to controls, even after LV size correction.
  • Vortex KE correlated with inflow KE and LV short-axis diameter; Doppler measurements showed strong correlation with phase-contrast MRI.

Conclusions:

  • The biphasic nature of diastolic filling dictates normal LV vortex physiology.
  • Vortex formation is exaggerated in NIDCM due to cardiac remodeling, with enlarged vortices aiding in reducing pressure losses and facilitating blood transport.
  • Ultrasound-based methods can accurately assess these vortex dynamics.

Keywords:
diastolic functiondoppler echocardiographyfluid dynamics

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