Pattern Changes in the Heart Rate Variability of Patients Undergoing Coronary Artery Bypass Grafting Surgery

Table 4

Ratio of decreased heart rate variability before and after surgery.

Time domain		Timing
		Before surgery ^(1) (n = 119)	After 7 days ^(2) (n = 109)	After 3 months ^(3) (n = 102)	After 6 months ^(4) (n = 102)
Decreased heart rate variability (n, %)	Yes	34 (28.6)	57 (52.3)	20 (19.6)	13 (12.7)
	No	85 (71.4)	52 (47,7)	82 (80,4)	89 (87.3)
			p(1,2) < 0,001	p(1,3) < 0.05	p(1,4) < 0.05
ASDNN (ms)	<30	23 (19.3)	50 (45.9)	14 (13.7)	6 (5.9)
	≥30	96 (80.7)	59 (54.1)	88 (86.3)	96 (94.1)
	p		p(1,2) < 0.05	p(1,3) > 0.05	p(1,4) < 0.05
rMSSD (ms^2)	<15	18 (15.1)	28 (25.7)	10 (9.8)	7 (6.9)
	≥15	101 (84.9)	81 (74.3)	92 (90.2)	95 (93.1)
	p		p(1,2) > 0.05	p(1,3) > 0.05	p(1,4) < 0.05
pNN 50 (%)	<0,75	26 (21.8)	34 (31.2)	13 (12.7)	11 (10.8)
		93 (78.2)	75 (68.8)	89 (87.3)	91 (89.2)
	p		p(1,2) > 0.05	p(1,3) > 0.05	p(1,4) < 0.05
SDNN (ms)	<50	10 (8.4)	23 (21,1)	2 (2.0)	1 (1.0)
		109 (91.6)	86 (78.9)	100 (98.0)	101 (99.0)
	p		p(1,2) < 0.05	p(1,3) < 0.05	p(1,4) < 0.05
SDANN (ms)	<40	6 (5.0)	22 (20.2)	2 (2.0)	1 (1.0)
		113 (95.0)	87 (79.8)	100 (98.0)	101 (99.0)
	p		p(1,2) < 0.05	p(1,3) > 0.05	p(1,4) > 0.05