Parameter changes and influencing factors in sixty patients with interventional surgery for liver cancer diagnoses

Table 1 Comparison of electrocardiographic-related parameters, mean ± SD

Group	Case	24 hours QTV	SDNN	SDANN-index	SDNN-index
Abnormal group	21	19.44 ± 3.12	75.88 ± 11.85	66.46 ± 9.44	28.11 ± 5.44
Non-abnormal group	39	22.89 ± 5.44	84.34 ± 12.44	72.46 ± 11.12	35.11 ± 7.44
t	-	3.120	2.592	2.204	4.162
P value	-	0.003	0.012	0.032	< 0.001

QTV: Interval variability; SDNN: 24 hours normal atrial polarization to ventricular polarization (R-R) interval (standard deviation); SDANN-index: 24 hours consecutive 5 minutes normal R-R interval; SDNN-index: 24 hours continuous 5 minutes normal R-R interval (standard deviation mean).