Effect of Combined Etomidate-Ketamine Anesthesia on Perioperative Electrocardiogram and Postoperative Cognitive Dysfunction of Elderly Patients with Rheumatic Heart Valve Disease Undergoing Heart Valve Replacement

Table 1

Comparison of incidence of patients’ perioperative ST-T wave changes [n (%)].

Group	Combined, n = 50	Ketamine, n = 50	X^2
T1	30 (60.0)	32 (64.0)	0.170	0.680
T2	18 (36.0)	28 (56.0)	4.026	0.045
T3	25 (50.0)	38 (76.0)	7.250	0.007
T4	28 (56.0)	40 (80.0)	6.618	0.010
T5	30 (60.0)	32 (64.0)	0.170	0.680