Objectives: To evaluate diagnostic accuracy of adenosine two-dimensional and three-dimensional myocardial contrast echocardiography (2D- and 3D-MCE) compared with single-photon emission computed tomography (SPECT) for assessing myocardial perfusion.
Methods: From January through August 2007, patients with known or suspected CAD who were referred for SPECT underwent simultaneous adenosine 2D-MCE and 3D-MCE (live and full volume [FV]). Perfusion and wall motion in 17 segments in the left anterior descending, left circumflex, and right coronary artery territories were analyzed.
Results: We studied 30 patients: mean (SD) age, 72.6 (8.2) years; 19 (63%) men. Perfusion by SPECT was abnormal in 13 patients (43%). When comparing MCE with SPECT, sensitivity was comparable for 2D-MCE, 92%; live 3D-MCE, 91%; and FV 3D-MCE, 90%. Specificity was comparable for 2D-MCE, 75%; live 3D-MCE, 69%; and FV 3D-MCE, 79%. Agreement between live 3D-MCE and 2D-MCE was 92% (kappa[SE], 0.83 [0.17]) and between FV 3D-MCE and 2D-MCE, 88% (kappa[SE], 0.76 [0.13]). For eight patients in whom SPECT showed reversible defects, live 3D-MCE correctly identified defects in seven (88%), whereas FV 3D-MCE correctly identified them in five (63%) (P = 0.57).
Conclusion: Myocardial perfusion assessment is feasible by 3D-MCE with the advantage of rapid, facile acquisition and offline image manipulation.