Table 2.

Arterial cannulation characteristics.

	Ultrasound group (n=30)	Palpation group (n=30)	P
First Attempt success rate	29 (96.6)	22 (73.3)	.03*
Total success rate	30 (100.0)	28 (93.3)	.47
Cannulation time (seconds)	44.2±28.2	71.2±83.3	.10
Total time (seconds)	542.5±26.8	580.0±122.7	.11
Hematoma	0	2 (.07)	.472
Infection	0	0	–

Date are expressed as mean ± standard deviation or n(%) values.

^*P<0.05.

The first-attempt success rate in the ultrasonography group was significantly higher than that in the palpation group. No significant differences between the 2 groups were observed in the total success rate, total procedure duration, cannulation duration, or rate of complications caused by cannulation.