Table 3.

Changes of radial artery diameter.

Variables	Saline group (n = 17)	Phentolamine group (n = 18)	Phentolamine+lidocaine group (n = 20)	P value
Diameter before injection (mm)	1.16 ± 0.11	1.16 ± 0.10	1.17 ± 0.10	0.906
Diameter after injection (mm)	1.13 ± 0.12	1.26 ± 0.15	1.32 ± 0.13	<0.01
P value	0.303	0.037	<0.01
Diameter after catheterization (mm)	1.14 ± 0.11	1.28 ± 0.10	1.35 ± 0.09	<0.01
Percentage change of diameter before and after injection (%)	2.00 ± 0.13	10.00 ± 0.17	13.00 ± 0.17	<0.01