Cardiac Systolic Rotation and Contraction Before and After Valve Replacement for Aortic Stenosis
A Myocardial Tagging Study Using MR Imaging
Joern J. W. Sandstede1,
Thorsten Johnson1,
Kerstin Harre2,
Meinrad Beer1,
Siegfried Hofmann1,
Thomas Pabst1,
Werner Kenn1,
Wolfram Voelker2,
Stefan Neubauer1,2 and
Dietbert Hahn1
1
Institut für Röntgendiagnostik & Medizinische Klinik,
Universität Würzburg, Josef-Schneider-Straße 2, D-97080
Würzburg, Germany.
2
Department of Cardiovascular Medicine, University of Oxford, John Radcliffe
Hospital, Headley Way, Oxford, OX3 9DU, United Kingdom.
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Fig. 1A. —59-year-old healthy male volunteer. Tagged MR image obtained
in left ventricular apical short-axis view obtained in end-diastole.
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Fig. 1B. —59-year-old healthy male volunteer. Tagged MR image obtained
at same level as A in end-systole.
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Fig. 1C. —59-year-old healthy male volunteer. Postprocessed image shows
tag intersection movement from end-diastole to end-systole ( ) with
recalculation of centroid (+) for each image. Analysis of rotation and
contraction calculated by subtraction of angle or radius, respectively, at
end-diastole and end-systole reveals counterclockwise rotation of 6.9° and
radial contraction of 5.1 mm. Mean circumferential shortening calculated from
percentual difference between end-diastolic and end-systolic circumference of
four segments (boundaries marked by [UNK]) is 25.8%.
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Fig. 2A. —75-year-old man with aortic stenosis. End-systolic tagged MR
image obtained in left ventricular apical short-axis view before surgical
valve replacement.
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Fig. 2B. —75-year-old man with aortic stenosis. Postprocessed image of
tag intersection movement from end-diastole to end-systole () with
recalculation of centroid (+) for each image reveals increase of
counter-clockwise rotation to 23.8° and decrease of radial contraction and
of circumferential shortening to 2.6 mm and 18.8%, respectively, before
surgical valve replacement and movement of centroid toward left side of
image.
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Fig. 2C. —75-year-old man with aortic stenosis. End-systolic tagged MR
image obtained at same level as A and B 3 months after surgical
valve replacement.
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Fig. 2D. —75-year-old man with aortic stenosis. Postprocessed image of
tag intersection movement shows that counterclockwise rotation is reduced to
16.7°; radial contraction and circumferential shortening are increased to
4.7 mm and 23.3%, respectively; and movement of centroid remains
unchanged.
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Copyright © 2002 by the American Roentgen Ray Society.
