Mild myocardial injury during percutaneous coronary intervention based on minor changes on electrocardiogram and heart rate variability

Table 1 Demographics and selected clinical features of the patients who have undergone coronary stenting, n (%)/mean ± SD

Parameter	Value
Age (years)	63.4 ± 5.3
Sex (male/female)	16/7
BMI (kg/m²)	28.4 ± 5.2
AH	20 (86.9)
Hb (g/L)	136.3 ± 17.1
Ht	41.2 ± 4.4
Тr (109/L)	231.3 ± 38.2
PTI	93.4 ± 10.5
Urea (mmol/L)	6.4 ± 2.2
Cr (μmol/L)	94.7 ± 22.5
Ischemic heart disease	23 (100)
Heart failure	21 (91.3)
Pulmonary hypertension	7 (30.4)
Pulmonary disease	9 (39.1)
Vessel disease	12 (52.2)

BMI: Body mass index; AH: Arterial hypertension; Hb: Hemoglobin; Ht: Hematocrit; Tr: Platelet count; PTI: Prothrombin index; Cr: Creatinine.

Table 2 Mean changes in complex parameters after stenting in the group as a whole and in subgroups (clusters)

	Cases	ΔCP MS	ΔCA FS	ΔCA CVE	ΔUscore	P value
The whole group	23	-2.2	-2.3	-0.3	-2.5
Cluster 1	5	-9.2	-20.0	-26.2	-17.4	0.002560
Cluster 2	7	6.3	13.9	10.3	9.7	0.000001
Cluster 3	11	-4.4	-4.6	4.6	-3.5	0.000015

ΔCP MS: Change complex myocardial status parameter; ΔCA FS: Change in complex functional status assessment; ΔCA CVE: Change in complex serious CardioVascular events risk assessment; ΔUscore: Change in Universal score.

Table 3 Primary electrocardiogram parameters-the best predictors of a complex indicator

Electrocardiogram and heart rate variability parameters	F-value	P-value
T wave amplitude in lead II	30.817	0.000
T wave amplitude in lead AvR	21.883	0.000
QRS-T angle in frontal plane	8.622	0.0001
Heart rhythm abnormalities index	4.449	0.008
HF-QRS	3.429	0.021
alpha T angle in frontal plane	2.867	0.022
Psychoemotional state index	1.964	0.094