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Table 3 Indices of cardiovascular autonomic control

From: QTc interval prolongation in HIV-infected patients: a case–control study by 24-hour Holter ECG recording

 

Cases (n=32)

Controls (n=64)

p

LF/HF ratio

2,78 ± 1,08

2,91 ± 1,23

0,306

LF (n.u.)

58, 48 ± 10,35

60,73 ± 9,68

0,151

HF (n.u.)

31,10 ± 7,43

30,72 ± 7,29

0,404

LF/HF ratio day

3,26 ±1,25

3,26 ± 1,43

0,491

LF day (n.u.)

62,91 ± 10,81

63,64 ± 10,81

0,378

HF day (n.u.)

26,85 ± 7,69

27,32 ± 7,26

0,385

LF/HF ratio night

1,90 ± 1,06

2,30 ± 1,14

0,050

LF night (n.u.)

50,30 ± 12,94

56,46 ± 10,41

0,007

HF night (n.u.)

38,76 ± 9,45

35,78 ± 9,46

0,077

SDNN (ms)

119,23 ± 38,64

122,93 ± 34,92

0,320

SDNN day (ms)

87,61 ± 25,14

97,26 ± 41,00

0,114

SDNN night (ms)

90,17 ± 27,66

104,22 ± 30,52

0,016

RMSSD (ms)

37,45 ± 14,74

40,49 ± 16,22

0,190

RMSSD day (ms)

36,16 ± 18,25

37,49 ± 16,00

0,358

RMSSD night (ms)

41,05 ± 18,00

43,23 ± 20,38

0,306

  1. Results are expressed as mean ± SD for each variable. LF: low frequency; HF: high frequency; LF/HF: low frequency/high frequency; n.u.: normalized units; SDNN: standard deviation of all sinus rhythm RR intervals; RMSSD: the square root of the mean of the sum of the squares of differences between adjacent NN intervals; night time: 0–6 am, day time: 7 am–11 pm.