Correlation between vortex ring formation and mitral annulus dynamics during ventricular rapid filling.
2007
One of the most important fluid phenomena observed in the
left ventricle during diastole is the presence of vortex rings
that develop with a strong jet entering through the mitral
valve. The present study is focused on the rapid filling phase
of diastole, during which the left ventricle expands and receives
blood through the fully open mitral valve. The atrio-ventricular
system during the rapid filling phase was emulated
experimentally with a simplified mechanical model in
which the relevant pressure decay and the dimension of
mitral annulus approximate the physiologic and pathologic
values. Digital particle image velocimetry measurements
were correlated with the force measurements on the mitral
annulus plane to analyze the relation between flow and the
mitral annulus motion. The recoil force on the displaced
annulus plane was computed on the basis of plane acceleration
and plane velocity and correlated with the inflow jet.
Measurements of the recoil force for different values of the
mitral annulus diameter showed that the recoil force was
generated during fluid propulsion and that it is maximal for
an annulus diameter close to the normal adult value in a
healthy left ventricle. We also tested annulus diameters
smaller and larger than the normal one. The smaller annulus
corresponds to the stenotic valves and the larger annulus
exists in dilated cardiomyopathy cases. In both conditions,
the recoil force was found to be smaller than in the normal
case. These observations are consistent with the previously
reported results for dilated cardiomyopathy and mitral stenosis
clinical conditions.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
39
References
70
Citations
NaN
KQI