Table 2.
CCTA procedural characteristics before and after the publication of 2013G
| Procedural characteristic | Total (n=5320) | Prior to guidelines (n=1871) | After guidelines (n=3449) | χ2 or t | P |
|---|---|---|---|---|---|
| Positive CCTA | 1729 (32.50) | 586 (31.30) | 1143 (33.14) | 1.789 | 0.1860 |
| Site of stenosis | |||||
| LM‡ | 52 (0.98) | 21 (1.12) | 31 (0.90) | 2.877 | 0.8241 |
| Proximal LAD§ | 1261 (23.71) | 429 (22.93) | 831 (24.09) | ||
| Other LAD|| | 424 (7.97) | 153 (8.81) | 271 (7.86) | ||
| Proximal LCX¶ | 476 (8.95) | 158 (8.44) | 318 (9.22) | ||
| Other LCX** | 263 (4.94) | 97 (5.18) | 166 (4.81) | ||
| Proximal RCA†† | 543 (10.21) | 197 (10.53) | 346 (10.03) | ||
| Other RCA‡‡ | 228 (4.29) | 79 (4.22) | 149 (4.32) | ||
| Diseased vessels | |||||
| 1 | 882 (16.58) | 282 (15.07) | 600 (17.40) | 0.891 | 0.3451 |
| 2 | 495 (9.30) | 187 (9.99) | 308 (8.93) | ||
| >2 | 352 (6.62) | 117 (6.25) | 235 (6.81) | ||
| Radiation dose (mSv) | 2.23 ± 4.47 | 2.34 ± 4.55 | 2.04 ± 4.30* | −2.380 | 0.0145 |
| Complications | |||||
| Contrast reaction | 26 (0.48) | 16 (0.86) | 10 (0.28)† | 7.311 | 0.0069 |
| Impaired renal function | 12 (0.22) | 8 (0.42) | 3 (0.09)* | 4.919 | 0.0266 |
| Contrast extravasation | 18 (0.34) | 11 (0.59) | 7 (0.20)* | 4.91 | 0.0361 |
| Other complications | 14 (0.26) | 9 (0.48) | 5 (0.14)* | 4.182 | 0.0408 |
Values are presented as mean ± SD or n (%).*P<0.05, †P<0.01;. ‡LM: Left main; §LAD: Left anterior descending; ||Other LAD included ramus intermedius, diagonal branch and middle and distal of LAD; ¶LCX: Left circumflex; **Other LCX included posterior descending artery from LCX, posterior-lateral branch from LCX and middle and distal of LCX; ††RCA: Right coronary artery; ‡‡Other RCA included posterior descending artery from RCA, posterior-lateral branch from RCA and middle and distal of RCA. CCTA: Coronary computed tomographic angiography; SD: Standard deviation.