Table 7.

Adverse events related to patient controlled analgesia^#.

Adverse events	CFNB (n = 127)	PCIA (n = 123)	P value
PCA period
Incomplete analgesia
In motion	9 (7.08)	21 (17.07)	0.015∗
At rest	0 (0)	0 (0)	—
Oversedation	2 (1.57)	5 (4.06)	0.275
Nausea and vomiting	3 (2.36)	4 (3.25)	0.719
Respiratory depression	0 (0)	2 (1.62)	0.149
Muscle weakness	4 (3.14)	1 (0.81)	0.370
Catheter thrombosis	0 (0)	0 (0)	—
Catheter dropout	0 (0)	0 (0)	—
Local hematoma	0 (0)	0 (0)	—
Local infection	0 (0)	0 (0)	—
Non-PCA period
Incomplete analgesia	15 (11.8)	25 (20.3)	0.066
Oversedation	0 (0)	0 (0)	—
Nausea and vomiting	1 (0.78)	0 (0)	1.000
Respiratory depression	0 (0)	0 (0)	—

^#For events less than 5 in both groups, Fisher's exact test was used; the rest were compared using chi-square test, *Pvalue <0.05.