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

Table 2

Heart rate variability by frequency domain before and after surgery.

Frequency 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)
VLF (ms^2)	( ± SD)	25.19 ± 12.28	18.32 ± 11.86	25.74 ± 9.18	29.75 ± 11.33
	P		p(1-2) < 0.001	p(1–3) > 0.05	p(1–4) < 0.05
LF (ms^2)	( ± SD)	16.26 ± 12.33	12.95 ± 11.93	17.06 ± 9.09	20.25 ± 9.91
	P		p(1-2) < 0.05	p(1–3) > 0.05	p(1–4) < 0.05
HF (ms^2)	( ± SD)	11.35 ± 7.21	8.74 ± 6.19	12.00 ± 6.26	12.91 ± 5.40
	P		p(1-2) < 0.001	p(1–3) > 0.05	p(1–4) > 0.05
LF/HF	( ± SD)	1.43 ± 0.40	1.48 ± 0.64	1.48 ± 0.42	1.59 ± 0.43
	P		p(1-2) > 0.05	p(1–3) > 0.05	p(1–4) < 0.05