Efficacy Assessment of Phentolamine Accompanied by Lidocaine Subcutaneously under Ultrasound Guidance on Radial Artery Catheterization in Pediatric Patients

Table 4

Changes of radial artery depth.

Variables	Saline group ()	Phentolamine group ()	Phentolamine+lidocaine group ()	P value
Depth before injection (mm)				0.561
Depth after injection (mm)				0.091
value	<0.01	<0.01	<0.01
Depth after catheterization (mm)				0.072