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[Diagnosis of coronary artery disease with 99Tcm-N-NOET myocardial perfusion imaging].

OBJECTIVE
To evaluate the sensitivity and specificity of (99)Tc(m)-N-NOET myocardial perfusion tomographic imaging (MPI) for the diagnosis of coronary artery disease (CAD).


METHODS
Coronary angiography and (99)Tc(m)-N-NOET myocardial perfusion tomographic imaging were performed in the patients hospitalized in the Department of Cardiology, Peking Union Medical College Hospital, from June to December 2005 with known or suspected diagnosis of CAD. Adenosine was infused intravenously at a rate of 140 microg x kg(-1)min(-1) for 6 minutes. At the third minute of adenosine infusion, 740 MBq (20 mCi) (99)Tc(m)-N-NOET was injected intravenously. MPI was obtained 15 minutes after the (99)Tc(m)-N-NOET infusion. If the result was abnormal, rest myocardial perfusion imaging would be performed 2 hours later. Coronary angiography was performed in all patients within one week after the myocardial perfusion imaging.


RESULTS
Myocardial perfusion imaging was performed in 53 cases, 36 males and 17 females, aged 56 +/- 10, who underwent coronary angiography, among which 31 had > or = 50% stenosis of coronary artery and 23 had normal coronary artery. All of the patients with stenosis of coronary artery had positive (99)Tc(m)-N-NOET adenosine stress myocardial perfusion imaging. Nineteen out of the 29 cases without stenosis of coronary artery had negative adenosine myocardial perfusion imaging. The sensitivity and specificity of (99)Tc(m)-N-NOET adenosine myocardial perfusion imaging were 100% and 73% respectively in the detection of stenosis of coronary arteries. Seven cases got percutaneous coronary intervention and 2 got coronary artery bypass graft. Six of the 9 patients undergoing revascularization had stenosis of stents or grafts, 5 of which had positive myocardial perfusion imaging. 3 cases hadn't restenosis and their results of myocardial perfusion imaging were negative.


CONCLUSION
(99)Tc(m)-N-NOET myocardial perfusion imaging is a useful non-interventional method for detecting coronary artery stenosis.