The Efficacy of Programmed Intermittent Epidural Bolus for Postoperative Analgesia after Open Gynecological Surgery: A Randomized Double-Blinded Study

Table 1

Baseline demographic and clinical characteristics of the programmed intermittent epidural bolus (PIEB) and continuous epidural infusion (CEI) groups.

Variable	PIEB group	CEI group	P value
	()	()
Age, year
30–39	3	5	0.478
40–49	7	9	0.612
50–59	7	5	0.473
60–69	8	6	0.490
70–79	3	4	0.723
Mean ± SD			0.669
Height, cm			0.196
Weight, kg			0.382
BMI, kg/m^2			0.572
ASA PS I/II/III	7/20/1	12/16/1	0.418
Duration of anesthesia, min			0.888
Duration of surgery, min			0.995
Type of surgery
Myomectomy	2	4	0.413
TAH	2	3	0.669
BSO	4	2	0.363
TAH + BSO	7	6	0.698
TAH + BSO + pelvic lymph node dissection	5	4	0.674
TAH + BSO + omentectomy + pelvic para-aortic lymph node dissection	8	10	0.631
Fluid volume, mL			0.747
Length of hospital stay, days			0.589

The data are presented as mean ± SD or number of patients; ASA PS: American Society of Anesthesiologists Physical Status; BMI: body mass index; BSO: bilateral salpingo-oophorectomy; CEI: continuous epidural infusion; PIEB: programmed intermittent epidural bolus; TAH: total abdominal hysterectomy.