Table 2 Procedure-related variables in patients undergoing subclavian vein catheterization in the supine and ipsilateral tilt position
Parameters | Group S (n = 107) | Group I (n = 109) | Mean (95% CI) difference | P value |
|---|---|---|---|---|
Venipuncture | ||||
 Primary venipuncture success rate | 61 (57.0) | 70 (64.2) | 7.2% (− 5.8 to 19.8) | .344 |
 Time to successful venipuncture (s) | 21.9 ± 34.8 | 16.9 ± 24.9 | 5.0 (− 13.1 to 3.1) | .228 |
 The number of venipuncture attempts (n) | 2.4 ± 2.8 | 2.2 ± 3.1 | 0.2 (− 1.0 to 0.6) | .605 |
 Successful venipuncture during the needle advancement | 80 (74.8) | 82 (75.2) | 0.4% (−11.07 to 11.89) | .999 |
The number of attempts for insertion (n) | ||||
 Guidewire | 1.4 ± 1.8 | 1.3 ± 0.9 | 0.1 (−0.5 to 0.3) | .361 |
 Dilator | 1.1 ± 0.3 | 1.3 ± 0.6 | 0.2 (0.1 to 0.3) | .001 |
 Catheter | 1.0 ± 0.3 | 1.0 ± 0.4 | 0.0 (− 0.1 to 0.1) | .988 |
Success rate of catheterization | ||||
 Overall | 107 (100.0) | 108 (99.1) * | 0.9% (−2.6 to 5.0) | .999 |
 At the first attempt | 92 (86.0) | 97 (89.0) | 3.0% (−6.0 to 12.1) | .643 |
 At the second attempt | 8 (7.5) | 5 (4.6) | 2.9% (−3.9 to 10.0) | .544 |
 At the third attempt | 5 (4.7) | 6 (5.5) | 0.8% (−5.7 to 7.4) | .999 |
 At the fourth attempt | 2 (1.9) | 0 (0.0) | 1.9% (−1.8 to 6.6) | .244 |
 First-pass success rate | 56 (52.3) | 51 (46.8) | 5.5% (−7.7 to 18.5) | .497 |
 Total catheterization time (s) | 106.6 ± 84.7 | 113.3 ± 80.7 | 6.7 (−15.5 to 28.9) | .551 |
 The incidence of rescue ventilation | 6 (5.6) | 7 (6.4) | 0.8% (−6.1 to 7.7) | .999 |