[Contrast agent improves diagnostic value of dobutamine stress echocardiography].
OBJECTIVE
Suboptimal endocardial definition reduces the diagnostic value of stress echocardiography for coronary artery disease, but intravenous infusion of a left ventricular contrast agent (Albunex) may enhance endocardial border delineation and improve the diagnostic value of dobutamine stress echocardiography.


METHODS
Fifty-six patients, 38 with myocardial infarction, 16 with angina pectoris and two normal subjects, were enrolled in this study. Dobutamine was infused in scalar doses of 5 to 40 micrograms/kg/min. Intravenous infusion of Albunex (0.15 ml/kg) was administered at rest and during peak dobutamine stress during monitoring of the apical four-chamber view. The left ventricle in the apical four-chamber view was divided into six segments and an endocardial delineation score of 0 to 3 (none to excellent visualization) was given to each segment.


RESULTS
Endocardial delineation score was increased after Albunex infusion from 2.0 to 2.3 in the basal-septal, 2.0 to 2.4 in the mid-septal, 1.1 to 1.8 in the apical-septal, 0.7 to 1.2 in the apical-lateral, 0.9 to 1.6 in the mid-lateral, and 1.2 to 1.9 in the basal-lateral segments during peak dobutamine administration. Endocardial border resolution in the lateral wall showed greater improvement than in the septal wall after Albunex infusion. Diagnostic values in the left anterior descending artery territory failed to improve with Albunex infusion (sensitivity 82% to 89%, specificity 94% to 89%, and accuracy 86% to 89%), whereas a higher diagnostic accuracy was noted in the left circumflex artery territory with Albunex compared to without Albunex (sensitivity 63% to 81%, specificity 88% to 98%, and accuracy 80% to 93%, p < 0.05).


CONCLUSIONS
Contrast agent improves the diagnostic accuracy of dobutamine stress echocardiography in the left circumflex artery territory.
Uehara
H
H
First Department of Internal Medicine, Kinki University School of Medicine, Ohnohigashi 377-2, Osakasayama, Osaka 589-8511.
Yamamoto
T
T
Hirano
Y
Y
Ozasa
Y
Y
Yamada
S
S
Ikawa
H
H
Ishikawa
K
K
D000368:Aged; D000418:Albumins / Q000008:administration & dosage*; D002316:Cardiotonic Agents / Q000008:administration & dosage; D003287:Contrast Media / Q000008:administration & dosage*; D003327:Coronary Disease / Q000000981:diagnostic imaging*; D004280:Dobutamine / Q000008:administration & dosage; D004452:Echocardiography / Q000379:methods* / Q000592:standards; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012680:Sensitivity and Specificity
D000418:Albumins; C060687:Albunex; D002316:Cardiotonic Agents; D003287:Contrast Media; D004280:Dobutamine