JACC. Cardiovascular imaging
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JACC Cardiovasc Imaging · Apr 2010
Comparative StudySensitivity of transcranial Doppler versus intracardiac echocardiography in the detection of right-to-left shunt.
The purpose of this study was to understand the reason for variation in the sensitivity of different methods of detecting right-to-left shunts (RLS). ⋯ Transcranial Doppler with immediate feedback provided by forced expiration against a manometer to 40 mm Hg is more sensitive than echocardiographic imaging for the detection of RLS. These observations have significant implications for determining the incidence of RLS in patients with stroke or migraine.
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JACC Cardiovasc Imaging · Mar 2010
Multicenter StudyReproducibility of proximal isovelocity surface area, vena contracta, and regurgitant jet area for assessment of mitral regurgitation severity.
The aim of this study was to evaluate the interobserver agreement of proximal isovelocity surface area (PISA) and vena contracta (VC) for differentiating severe from nonsevere mitral regurgitation (MR). ⋯ The VC and PISA measurements for distinction of severe versus nonsevere MR are only modestly reliable and associated with suboptimal interobserver agreement. The presence of an identifiable effective regurgitant orifice improves reproducibility of VC and a central regurgitant jet predicts substantial agreement among multiple observers of PISA assessment.
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JACC Cardiovasc Imaging · Mar 2010
Multicenter StudyThe impact of obesity on the left ventricle: the Multi-Ethnic Study of Atherosclerosis (MESA).
The purpose of this study was to evaluate the relationship of left ventricular (LV) remodeling assessed by cardiac magnetic resonance to various measures of obesity in a large population-based study. ⋯ Obesity was associated with concentric LV remodeling without change in ejection fraction in a large, multiethnic cohort study.
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JACC Cardiovasc Imaging · Feb 2010
Comparative StudyAssessment of myocardial viability at dobutamine echocardiography by deformation analysis using tissue velocity and speckle-tracking.
Comparison of myocardial tissue-velocity imaging (TVI) and speckle-tracking echocardiography (STE) for prediction of viability at dobutamine echocardiography (DbE). ⋯ Combination of TVI or STE methods with DbE can predict viability, with TVI strain and SR at LDD being the most accurate. TVI measures can predict viability in both anterior and posterior circulations, but STE measurements predict viability only in the anterior circulation.