SPECT/CT显像评价"功能相关冠状动脉病变"的价值

Objective There is great interest in the assessment of functionally relevant coronary artery lesions and its value in coronary artery disease (CAD) management by hybrid SPECT/CT.The obiective of this study was to evaluate the clinical value and the feasibility of imaging of hybrid SPECT/CT in detecting the"funotionally relevant coronary artery lesions(FRCAL)".Methods Forty patients with suspected or known CAD performed computed tomography coronary angiography (CTCA) and stress/rest myocardial perfusion imaging(MPI)with 99Tcm-methoxyisobutylisonitrile (MIBI) by hybrid SPECT/CT..Stress/rest MPI was performed with standard two-day protocol,and CTCA was performed the second day.performed with standard contrast medium autotrack sequence.Images of MPI and CTCA were fused by special fusion software (AutoQUNANT 7.0) in order to evaluate the funotional relationship between myocardial isehemia and CAD,videlicet"FRCAL".Results Twenty of the 40 patients had coronary atherosclerosis,malformation or coronary stenosis,with a total of 33 diseased coronary vessels(15 left anterior descending coronay artery,9 left circumflex coronary artery and 9 right coronary artery).The remaining 20 patients had normal results.MPI were normal in 22 and 18 showed myocardial ischemia and (or) infarct.The ratio of normal MPI in normal CTCA was 92.47%(86/93) by SPECT/CT imaging.The positive rates of detecting isehemia were 42.86% (6/14,＜75% diameter stenosis) and 92.31% (12/13,＞75% diameter stenosis or blockage).About 20.83% (25/120) of all the narrowed coronary arteries determined to be"FRCAL"and 25.93% (7/27) of the patients without coronary stenosis had myocardial ischemia.And then 15.38% (2/13)of the patients with CAD avoided invasive procedures (that was coronary angiography).About 42.86%(6/14) needed drug treatment or coronary revascularization(＜75% diameter stenosis).There was 1 patient with 1 vessel＞75% diameter stenosis but no coronary revascularization.Conclusion Fusion imaging of MPI and CTCA by hybrid SPECT/CT has clinical values in diagnosing CAD and selecting the"FRCAL"patients who might benefit from further revascularization procedures.

The value of hybrid SPECT/CT imaging in assessment of"functionally relevant coronary artery lesion"