Table 3.
Results of ultrasonographic measurements in control group and nitroglycerin group
| Control (N = 47) |
Nitroglycerin (N = 47) |
p-value | |
|---|---|---|---|
| Radial artery diameter (cm) | < 0.001 | ||
| T1 | 0.24 ± 0.04 | 0.24 ± 0.04 | |
| T2 | 0.24 ± 0.03 | 0.28 ± 0.04 | |
| T3 | 0.18 ± 0.04 | 0.24 ± 0.04 | |
| Percentage change of radial artery diameter at T2 (%) | 0 (0–0) | 20 (14–25) | < 0.001 |
| Percentage change of radial artery diameter at T3 (%) | −30 (−20–−13) | 0 (0–9) | < 0.001 |
| CSA (cm2) | < 0.001 | ||
| T1 | 0.045 ± 0.014 | 0.046 ± 0.012 | |
| T2 | 0.045 ± 0.013 | 0.066 ± 0.014 | |
| T3 | 0.027 ± 0.011 | 0.047 ± 0.014 | |
| Percentage change of CSA at T2 (%) | 0 (0–0) | 43(33–60) | < 0.001 |
| Percentage change of CSA at T3 (%) | −33 (−50–−25) | 0 (0–20) | < 0.001 |
| Depth (cm) | 0.289 | ||
| T1 | 0.24 ± 0.03 | 0.24 ± 0.04 | |
| T2 | 0.30 ± 0.03 | 0.29 ± 0.04 | |
| T3 | 0.30 ± 0.04 | 0.28 ± 0.04 | |
| TAMAX (cm/s) | |||
| T1 | 22 ± 9 | 25 ± 7 | 0.062 |
| T2 | 22 ± 9 | 25 ± 6 | 0.157 |
| Volume of blood flow(ml/sec) | |||
| T1 | 1.04 ± 0.76 | 1.14 ± 0.47 | 0.447 |
| T2 | 1.07 ± 0.69 | 1.61 ± 0.52 | < 0.001 |
Values are mean ± SD, median (interquartile range) [range]. T1 = baseline; T2 = 3 min after subcutaneous nitroglycerin injection or saline injection; T3 = immediately after radial artery cannulation. CSA cross-sectional area, TAMAX time average maximal velocity