Breath-hold dobutamine magnetic resonance myocardial tagging: Normal left ventricular response
Breath-hold dobutamine magnetic resonance myocardial tagging: Normal left ventricular response
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DOI：
10.1016/s0002-9149(97)00640-1
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发表时间：
1997-11-01
影响因子：
2.8
通讯作者：
Rogers, WJ
中科院分区：
文献类型：
--
作者：
Power, TP;Kramer, CM;Rogers, WJ
Analysis of the changes in myocardial deformation produced by adrenergic stress has been limited by the imaging techniques used, We used rapid magnetic resonance imaging (MRI) myocardial tagging to map the dose-dependent response to incremental dobutamine in the normal human left ventricle, Thirteen volunteers underwent breath-hold tagged cine MRI during dobutamine infusion, Images were acquired throughout systole to a peak dose of 20 mu g/kg/min. End-systolic percent circumferential shortening (%S) was measured at 3 transmural locations and 4 circumferential locations at 3 long-axis positions. Mean circumferential shortening velocity (CSV) was also calculated at each location and dose, Mean %S reached a maximum of 26 +/- 3% at 10 mu g/kg/min compared with 21 +/- 4% at baseline (p < 0.003), Peak %S was reached by 10 mu g/kg/min before a significant increase in heart rate or blood pressure and was unchanged at higher doses, In contrast, CSV increased linearly with dobutamine dose from 4.4 +/- 0.9 mm/s at baseline to 9.8 +/- 1.4 mm/s at 20 mu g/kg/min (p < 0.0001), Breath-hold tagged dobutamine MRI is safe and effective in detecting regional and transmural changes in function during incremental dobutamine. CSV increased continuously across the dobutamine dose range, At low dose (less than or equal to 10 mu g/kg/min) %S increased without any change in blood pressure or heart rate. Maintenance of peak %S beyond 10 mu g/kg/min in the presence of decreasing systolic intervals resulted from a continued increase in CSV. Thus, CSV may be the preferred measure of contractile function during dobutamine stimulation in human myocardium. (C) 1997 by Excerpta Medica, Inc.
