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Table 4 Characteristics of studies assessing non-invasive imaging of coronary artery bypass grafts.

From: Non-invasive assessment of coronary artery bypass graft patency using 16-slice computed tomography angiography

  Achenbach et al Engleman et al Engleman et al Ropers et al Ko et al Marano et al Schlosser et al Martuscelli et al Moore et al Chiurlia et al Houslay et al Pooled data
Year of publication 1997 1997 2000 2001 2003 2004 2004 2004 2005 2005 2005  
Method Electron beam CT Spiral CT Spiral CT Spiral CT 4 slice CT 4 slice CT 16 slice CT 16 slice CT 4 slice CT 16 slice CT 16 slice CT  
No. of patients 25 49 24 65 39 57 51 96 50 52 50  
Mean age 64 61 61 67 60 65 65 62 69 63 66  
Sex (% male) 92 92 92 82 74 95 76 83% 76 87 86  
No. grafts 54 134 78 182 115 122 131 251 150 165 116 1498
IMA 1 42 20 20 40 95 40 85 38 46 35 462
SVG 53 92 58 162 54 27 91 166 112 117 77 1009
other      21      2 4 27
% vein grafts 98% 69% 74% 89% 47% 22% 69% 66% 66% 70% 66%  
Mean graft age (yrs) 6.9 1.8 2.1 7.6 1.2 4.8 5.6 7 8 7.9 7.0  
Sensitivity 100% 92% 90.1% 97% 93% 93% 96% 100% 91% 100% 93% 96%
Specificity 100% 97% 100% 98% 99% 98% 95% 100% 100% 100% 100% 99%
PPV 100% 99% 100% 97% 93% 93% 81% 100% 100% 100% 100% 99%
NPV 100% 78% 74% 98% 99% 98% 99% 100% 96% 100% 85% 95%
Accuracy 100% 93% 92% 98% 98% 97% 95% 100% 97% 100% 95% 97%
  1. IMA: internal mammary artery; SVG: saphenous vein graft; PPV: positive predictive value; NPV: negative predictive value.