Ultrasound-guided quadratus lumborum block with general anesthesia for perioperative circulatory stability in colorectal cancer surgery

Table 1 Variations in cardiovascular function indicators, mean ± SD

Time point	Indicators	Experiment group (n = 58)	Control group (n = 58)	t value	P value
T0	MAP (mmHg)	95.30 ± 8.25	94.87 ± 7.96	0.286	0.776
T1	MAP (mmHg)	87.65 ± 7.12	82.34 ± 8.14	3.739	< 0.001a
T2	MAP (mmHg)	85.20 ± 6.98	78.56 ± 7.45	4.953	< 0.001a
T3	MAP (mmHg)	88.56 ± 7.32	80.43 ± 6.98	6.122	< 0.001a
T4	MAP (mmHg)	93.76 ± 7.02	89.56 ± 7.88	3.031	0.003a
T0	HR (time/minute)	70.12 ± 7.24	72.34 ± 6.98	-1.573	0.119
T1	HR (time/minute)	68.75 ± 6.45	75.98 ± 6.92	-5.821	< 0.001a
T2	HR (time/minute)	66.78 ± 6.12	79.20 ± 7.02	-10.156	< 0.001a
T3	HR (time/minute)	70.34 ± 6.88	76.78 ± 7.34	-4.875	< 0.001a
T4	HR (time/minute)	71.45 ± 7.12	74.56 ± 7.78	-2.246	0.027a

^aP < 0.05.

P indicating a statistically significant difference. MAP: Mean arterial pressure; HR: Heart rate.