Cardiovascular Autonomic Dysfunction in Patients of Nonalcoholic Fatty Liver Disease
Table 3
Time domain and frequency domain indices of HRV in controls, Grade I and Grade II NAFLD.
Controls ()
Grade I ()
Grade II ()
value
Diabetics (, %)
—
16, 51.6%
8, 44.4%
0.62
Time domain indices
SDNN (ms)
40.7
28.3
0.010
(24.6–61.5)
(19.5–46.3)
(14.7–26.0)
SDSD (ms)
24.2
18.8
0.026
(17.3–43.2)
(12.4–29.8)
(9.1–28.4)
pNN50 (%)
0.04
0.01
0.016
(0.00–0.22)
(0.00–0.07)
(0.00–0.01)
Frequency domain indices
LF nu
40.2
37.8
44.5
0.435
(33.4–53.6)
(27.1–53.3)
(20.1–50.0)
HF nu
29.2
19.7
23.1
0.650
(18.4–43.9)
(14.9–37.9)
(19.3–35.8)
LF : HF ratio
1.5
1.6
1.4
0.804
(0.9–3.0)
(0.9–3.4)
(0.8–2.7)
Total power (ms2)
1166.5
515.0
0.006
(383.5–2312.6)
(271.1–1374.3)
(157.5–382.6)
Values are expressed as median (IQR); versus control. SDNN: standard deviation of all NN intervals; SDSD: standard deviation of differences between adjacent NN intervals; pNN50%: NN50 count divided by the total number of all NN intervals; LF: low frequency (0.04–0.15 Hz); HF: high frequency (0.15–0.40 Hz); nu: normalized unit.
