The value of 64 multislice CT in the evaluation of coronary bypass grafts

LI Zhong-xin; YU Shu-jing; MA Guo-jun

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Journal of China Clinic Medical Imaging ›› 2007, Vol. 18 ›› Issue (9) : 643-645.

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The value of 64 multislice CT in the evaluation of coronary bypass grafts

LI Zhong-xin, YU Shu-jing, MA Guo-jun

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Abstract

Objective: To study the clinical application value of 64 multislice spiral CT(MSCT) in evaluating the bridge vessel of coronary artery. Method: Twenty-one patients after bypass operation of coronary artery(77 bridge vessel, including 20 internal mammary artery bridge, 1 radial artery bridge and 56 great saphenous vein bridge) received 64 multislice spiral CT angiography(CTA). The average heart rate of patients is (60±5)/min scanning. The range of scanning is from internal mammary artery to 2cm below diaphragm. Two experienced doctors evaluate the degree of opening and stenosis of bridge vessel of coronary artery. 9 patients who had been found bridge vessel or distal stoma of coronary artery stenosis(≥50%) by MSCT accepted traditional coronary artery angiography at the same time. Result: CTA was performed successfully in all of the 21 patients. Differernt degree of stenosis or obstruction of the main coronary artery and main branch in all of the 21 patients were showed by CTA. Sixty-two bridge vessels of coronary artery are open and smooth. 10 were obstructed(including 2 internal mammary and 8 vein bridge). 3 were stenotic(≥50%) in proximal end anastomotic stoma of bridge vessel. 2 were stenotic in distal anastomotic stoma. 6 vessels had restenosis or obstruction in distal coronary artery of anastomotic stoma. The results of CAG and CTA are the same in 9 patients. The accuracy of CTA in evaluating the stenosis (≥50%) or obstruction was 100%. Conclusion: CTA can evaluate the bridge vessel of coronary artery and the degree of restenosis of stoma accurately. CTA can discover the location of proximal end stoma directly and guide the approach of CAG after bypass operation of coronary artery. CTA is the method of choice to evaluate the abnormalities of the bridge vessel of coronary artery.

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coronary stenosis / tomography / spiral computed

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LI Zhong-xin;YU Shu-jing;MA Guo-jun. The value of 64 multislice CT in the evaluation of coronary bypass grafts[J]. Journal of China Clinic Medical Imaging. 2007, 18(9): 643-645