Table 1. HRV frequency-domain metrics during acute hemorrhagic shock and fluid resuscitation.
Mean ± SD.
| Variables | Group | Baseline | Hemo5 | Hemo10 | Hemo15 | Shock30 | Shock60 | R0 | R60 | R120 | R180 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| VLF abs | S | 3,11 ± 3,48 | 8,46 ± 9,38 * | 1,13 ± 1,08 | 2,72 ± 2,47 | 0,94 ± 1,46 | 0,82 ± 1,18 | 0,53 ± 0,4256 | 1,35 ± 1,08 | 2,17 ± 2,36 | 2,10 ± 2,15 |
| (ms2) | NS | 2,40 ± 3,63 | 6,02 ± 6,09 | 22,73 ± 32,07 A | 457,7 ± 1168 | 1,54 ± 2,62 | 0,53 ± 0,61 | ||||
| LF abs | S | 5,06 ± 5,93 | 12,44 ± 19,77 | 21,8 ± 15,43 * | 2,23 ± 2,42 | 1,87 ± 3,98 | 1,88 ± 3,38 | 0,84 ± 0,92 | 2,06 ± 1,69 | 2,98 ± 2,29 | 3,35 ± 2,90 |
| (ms2) | NS | 5,25 ± 5,76 | 13,69 ± 17,05 | 54,25 ± 74,29 | 851,0 ± 2176 | 3,25 ± 5,76 | 1,32 ± 1,89 | ||||
| HF abs | S | 5,95 ± 5,94 | 52,67 ± 144,1 | 19,12 ± 43,95 | 56,54 ± 93,15 | 0,74 ± 1,07 | 1,20 ± 1,47 | 0,73 ± 0,57 | 1,91 ± 0,54 | 1,14 ± 0,59 | 1,33 ± 0,79 |
| (ms2) | NS | 2,99 ± 3,10 | 3309 ± 8044 | 386,6 ± 754,3 A | 52,67 ± 144,1 | 1,14 ± 1,04 | 0,78 ± 0,88 | ||||
| VLF % | S | 16,30 ± 7,56 | 24,9 ± 13,72 | 21,8 ± 15,43 | 26 ± 12,5 | 24,1 ± 3,93 | 17,8 ± 5,27 | 20,82 ± 9,57 | 23,36 ± 6,93 | 25,55 ± 7,06 | 24,91 ± 6,49 |
| NS | 15,14 ± 5,70 | 25 ± 14,12 | 14,57 ± 6,27 | 21,29 ± 19,7 | 17,86 ± 5,43 A | 13,25 ± 7,18 | |||||
| LF % | S | 28,3 ± 17,19 | 20,0 ± 12,1 | 21,6 ± 12,76 | 22,8 ± 13,46 | 34,2 ± 16,07 | 32,8 ± 14,77 | 30,55 ± 11,4 | 38,09 ± 12,23 | 42,0 ± 14,76 † | 43,09 ± 13,35 § |
| NS | 36,43 ± 14,11 | 29,71 ±11,47 | 19,71 ± 18,74 | 22,0 ± 10,34 | 36,86 ± 11,89 | 30,5 ± 19,43 | |||||
| HF % | S | 55,3 ± 24,15 | 54,9 ± 24,73 | 56,4 ± 27,31 | 51,2 ± 21,38 | 41,9 ± 15,67 | 49,5 ± 18,45 | 48,73 ± 15,21 | 38,64 ± 14,71 | 32,55 ± 15,26 | 32,2 ± 14,26 |
| NS | 48,57 ± 19,28 | 45,29 ± 18,92 | 65,71 ± 24,5 | 56,71 ± 25,71 | 45 ± 16,41 | 56,5 ± 25,96 | |||||
| LF nu | S | 37,2 ± 25,75 | 31,9 ± 23,35 | 32,51 ± 23,51 | 36,3 ± 21,48 | 47,4 ± 20,61 | 42,7 ± 20,03 | 41,18 ± 15,43 | 52,19 ± 16,41 | 58,27 ± 19,87 | 59 ± 18,01 |
| NS | 45,14 ± 19,41 | 43,57 ± 17,8 | 26,14 ± 24,48 | 33 ± 20,55 | 48,29 ± 16,88 | 37,75 ± 25,14 | |||||
| HF nu | S | 62,8 ± 25,75 | 68,1 ± 23,35 | 67,2 ± 23,51 | 63,7 ± 21,48 | 52,6 ± 20,61 | 57,3 ± 20,03 | 58,82 ±1 5,43 | 47,82 ± 16,41 | 41,73 ± 19,87 | 41,0 ± 18,01 |
| NS | 54,86 ± 19,41 | 56,43 ± 17,8 | 73,86 ± 24,48 | 67,0 ± 20,55 | 51,71 ± 16,88 | 62,25 ± 25,14 | |||||
| LF/HF | S | 2,93 ± 4,86 | 1,65 ± 2,40 | 1,10 ± 1,22 | 1,63 ±2,11 | 2,21 ± 2,24 | 1,70 ± 1,69 | 1,25 ± 0,71 | 2,37 ± 1,93 | 3,18 ± 2,50 | 2,97 ± 1,90 |
| NS | 1,74 ± 1,47 | 1,466 ± 1,18 | 0,83 ± 1,12 | 1,08±1,01 | 2,29 ± 2,12 | 1,87 ± 1,92 |
VLF = spectral power at the very low frequency; LF = spectral power at the low frequency; HF = spectral power at the high frequency; LF/HF = low to high frequency index ratio; Hemo5 = 5 minutes hemorrhage; Hemo10 = 10 minutes hemorrhage; Hemo15 = 15 minutes hemorrhage; Shock30 = 30 min after hemorrhagic shock; Shock60 = 60 min after hemorrhagic shock; R0 = immediately after fluid resuscitation; R60 = 60 min after fluid resuscitation; R120 = 120 min after fluid resuscitation; R180 = 180 min after fluid resuscitation
* = P<0.05 different from Baseline
†<0,05 different from CH5 and CH10
§ <0,05 different from CH5, CH10 e CH15
A = P<0.05 group NS different from group S.