JACC. Cardiovascular imaging
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JACC Cardiovasc Imaging · Sep 2011
3D echocardiography to evaluate right atrial pressure in acutely decompensated heart failure correlation with invasive hemodynamics.
This study examined the utility of 3-dimensional right atrial volume index (3D-RAVi), combined with 2-dimensional echocardiographic (2DE) parameters, for the identification of elevated right atrial pressure (RAP) in patients with heart failure. ⋯ In patients with heart failure, 3D-RAVi in conjunction with IVC parameters has a high accuracy for detection of elevated RAP. The addition of 3D-RAVi to 2DE methods may be helpful in the noninvasive estimation of right atrial pressure.
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JACC Cardiovasc Imaging · Sep 2011
Physiological basis for angina and ST-segment change PET-verified thresholds of quantitative stress myocardial perfusion and coronary flow reserve.
This study aimed to determine the quantitative low-flow threshold for stress-induced perfusion defects with severe angina and/or significant ST-segment depression during dipyridamole hyperemia. ⋯ Thresholds of low myocardial vasodilator stress perfusion in ml/min/g and CFR sharply separate patients with angina or ST-segment change from those without these manifestations of ischemia during dipyridamole stress with excellent discrimination. Stress flow below 0.91 ml/min/g in dipyridamole-induced PET perfusion defects causes significant ST-segment depression and/or severe angina. However, when the worst vasodilator stress flow exceeds 1.12 ml/min/g, these manifestations of ischemia occur rarely.