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Usefulness of pulse-wave Doppler tissue sampling and dobutamine stress echocardiography for the diagnosis of right coronary artery narrowing.
- Source :
-
American Journal of Cardiology . 06/15/98, Vol. 81 Issue 12, p1411-1415. 5p. 4 Charts, 7 Graphs. - Publication Year :
- 1998
-
Abstract
- To study the feasibility and diagnostic accuracy of right coronary artery (RCA) narrowing by right ventricular (RV) pulse-wave Doppler tissue sampling during dobutamine stress echocardiography (DSE), 30 patients (mean age 55 +/- 9.5 years, 26 men) with suspected coronary artery disease underwent DSE (up to 40 microg/kg/min with additional atropine during submaximum heart rate responses). Pulse-wave Doppler tissue sampling of RV free walls close to the tricuspid annulus was performed in the apical 4-chamber view. The maximum velocity during the ejection phase, early, and late diastole was measured. Data from 5 consecutive beats were averaged. The measurements were repeated at rest, at low dose (10 microg/kg/min), and at peak dobutamine stress. The results were evaluated for the prediction of significant proximal or medium RCA narrowing (> or = 50% diameter stenosis, assessed by quantitative coronary angiography within the previous 3 months). A progressive increase of the ejection phase velocity (> 25% between 10 microg/kg/min and peak stress) was predictive of a normal RCA, whereas a blunted increase and/or decrease (< 25% of increase) was predictive of significant RCA narrowing: sensitivity (95% confidence intervals): 82% (68 to 96), specificity: 78% (67 to 93), positive predictive value: 69% (52 to 86), negative predictive value: 88% (75 to 100), accuracy: 79% (65 to 94). Pulse-wave Doppler tissue sampling provided analyzable data in 100%, whereas the visual assessment of gray-scale images was possible only in 90%. Thus, in patients with suspected RCA narrowing, pulse-wave Doppler tissue sampling during DSE was able to diagnose significant RCA narrowing. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CORONARY artery stenosis
*DOPPLER echocardiography
*DOBUTAMINE
*DIAGNOSIS
Subjects
Details
- Language :
- English
- ISSN :
- 00029149
- Volume :
- 81
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- American Journal of Cardiology
- Publication Type :
- Academic Journal
- Accession number :
- 787391
- Full Text :
- https://doi.org/10.1016/S0002-9149(98)00208-2