Dexmedetomidine versus fentanyl effect as adjuvants to bupivacaine on post spinal urinary retention in knee joint arthroscopic surgeries

Figures & data

Figure 1. Consort flow chart.

Table 1. Demographic data of patients in both groups.

Variables	Group BD (N=35)	Group BF (N=35)	P value
Age(years)	39.46 ± 7.63	40.29 ± 7.78	0.654
Sex (M/F)	27/8	30/5	0.356
Height(cm)	172.63 ± 8.52	172.14 ± 6.43	0.789
ASA(I/II)	31/4	32/3	0.690
Duration of surgery(min)	90.43 ± 17.63	91.29 ± 17.21	0.838

Data are presented as mean± SD or count. BD: Bupivacaine-Dexmedetomidine group, BF: Bupivacaine-Fentanyl group.

Figure 2. Incidence of POUR in both groups at the 3^rd post-operative hour.

Data are presented as percentage of patients. Bupivacaine-Dexmedetomidine group, BF: Bupivacaine-Fentanyl group, POUR: Post-operative urinary retention.

Table 2. Intra-operative fluids, and post-operative micturition characteristics in both groups.

Variables	Group BD (N=35)	Group BF (N=35)	P value
Intraoperative fluids (ml)	1234.3 ± 187.4	1227.1 ± 198.3	0.877
Urinary bladder volume(ml)	464.9 ± 81.8	484.1 ± 96.3	0.373
Time to micturition or catheterization (min)	222.1 ± 26.1	212.4 ± 35.7	0.205

Data are presented as mean± SD. Urinary bladder volume (ml); assessed by the ultrasound at the 3rd post-operative hour, or before voiding. BD: Bupivacaine-Dexmedetomidine group, BF: Bupivacaine-Fentanyl group.

Table 3. Sensory and motor block durations in both groups.

Variables	Group BD (N=35)	Group BF (N=35)	P value
Duration of sensory block (min)	199.7 ± 25.15	190.3 ± 37.8	0.223
Duration of motor block (min)	167.9 ± 27.21	154.6 ± 35.74	0.085

Data presented as mean± SD. BD: Bupivacaine-Dexmedetomidine group, BF: Bupivacaine-Fentanyl group.

Table 4. Variables in the equation for the binomial logistic regression.

		B	S.E.	Wald	df	Sig.	Exp(B)	95% C.I. for EXP(B)
								Lower	Upper
Age		0.040	0.089	0.203	1	0.652	1.041	0.874	1.240
Sex		−0.833	2.018	0.171	1	0.680	0.435	0.008	22.676
Duration of operation		−0.010	0.080	0.016	1	0.900	0.990	0.846	1.158
Intraoperative fluids		0.003	0.008	0.106	1	0.745	1.003	0.987	1.018
Duration of sensory block		0.076	0.028	7.259	1	0.007	1.078	1.021	1.139

For each unit increase in the duration of sensory block, the odds of having POUR increase by a factor of 1.078.