(Circulation. 1999;100:361-368.)
© 1999 American Heart Association, Inc.
Clinical Investigation and Reports |
Alterations in the Local Myocardial Motion Pattern in Patients Suffering From Pressure Overload Due to Aortic Stenosis
From the Institute of Biomedical Engineering and Medical Informatics, University and ETH Zurich (M.S., M.B.S., S.E.F., P.B.), and the Department of Internal Medicine, Cardiology, University Hospital (E.N., F.S., O.M.H.), Zurich, Switzerland.
Correspondence to Prof Dr P. Boesiger, Institute of Biomedical Engineering and Medical Informatics, University and ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland. E-mail boesiger{at}biomed.ee.ethz.ch
Background—MR tissue tagging allows the noninvasive assessment of the locally and temporally resolved motion pattern of the left ventricle. Alterations in cardiac torsion and diastolic relaxation of the left ventricle were studied in patients with aortic stenosis and were compared with those of healthy control subjects and championship rowers with physiological volume-overload hypertrophy.
Methods and Results—Twelve aortic stenosis patients, 11 healthy control subjects with normal left ventricular function, and 11 world-championship rowers were investigated for systolic and diastolic heart wall motion on a basal and an apical level of the myocardium. Systolic torsion and untwisting during diastole were examined by use of a novel tagging technique (CSPAMM) that provides access to systolic and diastolic motion data. In the healthy heart, the left ventricle performs a systolic wringing motion, with a counterclockwise rotation at the apex and a clockwise rotation at the base. Apical untwisting precedes diastolic filling. In the athlete's heart, torsion and untwisting remain unchanged compared with those of the control subjects. In aortic stenosis patients, torsion is significantly increased and diastolic apical untwisting is prolonged compared with those of control subjects or athletes.
Conclusions—Torsional behavior as observed in pressure- and volume-overloaded hearts is consistent with current theoretical findings. A delayed diastolic untwisting in the pressure-overloaded hearts of the patients may contribute to a tendency toward diastolic dysfunction.
Key Words: magnetic resonance imaging • hypertrophy • stenosis • mechanics
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