Table 5.

Radial artery catheterization data.

Variables	Saline group (n = 17)	Phentolamine group (n = 18)	Phentolamine+lidocaine group (n = 20)	P value
First-attempt success rate (%)	10 (58.82%)	16 (88.89%)	18 (90.00%)	0.032
Procedure time to success within the first attempt (s)	56.50 ± 7.62	47.21 ± 7.43	42.71 ± 7.71	<0.01
Second-attempt success rate within 10 min (%)	14 (82.35%)	16 (88.89%)	18 (90.00%)	0.761
Procedure time to success within the second attempt (s)	61.79 ± 11.12	49.19 ± 9.59	43.67 ± 8.52	<0.01
Use of another artery (%)	3 (17.65%)	2 (11.11%)	2 (10.00%)	0.761
Overall procedure time of arterial cannulation (s)	66.53 ± 14.72	53.33 ± 15.13	48.35 ± 16.53	<0.01
Overall numbers of attempts	1.65 ± 0.93	1.33 ± 0.69	1.25 ± 0.64	0.262