Why the study?
Does electron-beam computed tomography accurately assess coronary bypass graft patency compared to conventional selective coronary angiography in patients undergoing coronary artery bypass grafting?
Does electron-beam computed tomography accurately assess coronary bypass graft patency compared to conventional selective coronary angiography in patients undergoing coronary artery bypass grafting?
Electron-beam computed tomography demonstrates high specificity and negative predictive value for noninvasive evaluation of coronary bypass graft patency, though sensitivity varies by coronary region.
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Supports noninvasive graft patency assessment with high specificity; leaves open routine adoption pending higher-sensitivity validation.
Twenty-one patients undergoing coronary artery bypass grafting were prospectively evaluated by conventional selective coronary angiography and electron-beam computed tomography. Eighty bypass grafts (60 saphenous vein and 20 left or right internal mammary artery) were evaluated for patency. The sensitivity and specificity of electron-beam computed tomography were 72% and 100%, respectively; positive and negative predictive values were 100% and 92.5%, respectively. Sensitivity and specificity according to coronary region were: left anterior descending artery, 33% and 100%; diagonal artery, 67% and 100%; circumflex artery, 75% and 100%; right coronary artery, 100% and 100%. Electron-beam computed tomography is relatively accurate and a promising tool for noninvasive evaluation of graft patency after coronary artery bypass graft surgery.
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Aziz et al. (2003) studied this question.
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