Clinical effect of ultrasound-guided nerve block and dexmedetomidine anesthesia on lower extremity operative fracture reduction

Table 2 Comparison of mean arterial pressure, heart rate and blood oxygen saturation in different time periods between the two groups

Index	Cases	T0	T1	T2	T3	T4
MAP (mmHg)
Observation group	60	92.54 ± 8.11	94.40 ± 7.10	90.84 ± 7.21	91.03 ± 6.84	90.42 ± 7.12
Control group	60	93.01 ± 7.80	86.45 ± 6.58	82.30 ± 7.15	83.39 ± 6.84	90.05 ± 6.10
t value		-0.324	6.361	6.515	6.118	0.306
P value		0.747	0.000	0.000	0.000	0.760
HR (times/min)
Observation group	60	82.21 ± 3.82	76.60 ± 7.52	75.40 ± 8.03	76.64 ± 7.11	81.21 ± 6.64
Control group	60	82.05 ± 3.95	88.15 ± 6.94	71.03 ± 7.22	70.45 ± 6.20	83.35 ± 7.10
t value		0.226	-8.743	3.135	5.083	-1.705
P value		0.822	0.000	0.002	0.000	0.091
SpO2 (%)
Observation group	60	97.78 ± 1.22	97.87 ± 1.12	97.68 ± 1.20	98.00 ± 1.12	98.11 ± 1.14
Control group	60	97.03 ± 1.35	97.70 ± 1.10	97.79 ± 1.23	97.76 ± 1.22	98.03 ± 1.18
t value		3.193	0.839	-0.496	1.123	0.378
P value		0.002	0.403	0.621	0.264	0.706

MAP: Mean arterial pressure; HR: Heart rate; SpO₂: Blood oxygen saturation.