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patient doppler velocity dobutamine tissue stress imaging doppler tissue imaging motion echocardiography dobutamine stress echocardiography segment viability study wall motion fioretti pm function improvement assessment myocardium heart rambaldi r value ischemia rambaldi disease ejection roelandt jrtc dysfunction fioretti sampling response group suppl right revascularization cardiol colour technique agreement analysis table infarction infusion image systolic perfusion wall motion abnormalities boersma e diastolic roelandt region blood change increase fraction interpretation result contractile reserve artery atropine ejection fraction phase echocardiographic apical bax jj contraction volume j alii coronaty pressure pattern valkema r uptake cardiography evaluation systolic blood pressure ventricle hypotension presence