Objective-To evaluate the eYciency of the new technique colour Doppler tissue imaging (DTI) by studying the concordance between dobutamine DTI, standard grey scale echocardiography (SE), and rest-reinjection TI-201 tomography (TI) in dysfunctional myocardium. Patients-23 patients with chronic wall motion abnormalities and proven coronary artery disease (> 70% diameter stenosis of at least one major coronary artery at angiogram). Methods-The contractile reserve and the resting perfusion characteristics of dysfunctional myocardial segments were assessed with low dose dobutamine SE and/or DTI (2.5 up to 20 /kg/min) and TI on a semiquantitative basis. The DTI or SE data were separately compared with TI, on the basis of a 13 segment ventricular model. The resulting score of combined DTI and SE was also compared with TI. Finally the results obtained from DTI were compared with SE. Results-A total of 142 severely hypokinetic or akinetic segments were visualised. The viability study was feasible in 127 (89%) and 121 (85%) segments with DTI and SE, respectively. TI detected viability more frequently than DTI (84 v 61, p < 0.001) and SE (80 v 50, p < 0.001). However, as many viable segments were detected with combined DTI and SE as with TI (78 v 84, NS). The values between TI and SE, DTI or combined SE and DTI were 0.38, 0.45, and 0.57, respectively, and increased to 0.52 and 0.76, respectively, for SE and DTI versus TI when mid-anterior and mid-inferior segments only were considered. The value between SE and DTI was 0.34. Conclusions-DTI is a helpful adjunct to SE, when using low dose dobutamine. This combination revealed as many viable segments as TI and showed a better agreement than DTI or SE alone for the assessment of myocardial viable segments evidenced by TI. (Heart 1999;82:432-437) Keywords: colour Doppler tissue imaging; hibernating myocardium; thallium 201 single photon emission computed tomography; stress echocardiography Stress echocardiography is currently performed to detect hibernating myocardium in patients suVering from chronic coronary artery disease. [1][2][3][4][5] Other techniques such as thallium-201 reinjection tomography (TI) and positron emission tomography might oVer a good prediction of contractility recovery after myocardial reperfusion or revascularisation.5-8 High concordance between stress echocardiography or TI and positron emission tomography was observed in studies involving small series of patients.8 9 Two previous studies comparing standard echocardiography (SE) and TI paradoxically showed discordances in the specificity for recovery of function.
11Doppler tissue imaging (DTI) was introduced with the hope to give a quantitative echocardiographic approach to myocardial wall velocities and to minimise the subjectivity of SE assessment of ventricular function.12-19 A visual semiquantitative evaluation of dobutamine on DTI colour images versus grey scale echocardiography has been recently reported, but no reference method was used.
20To test the eYciency of this new technique we...