Characteristic | Rest | 15° tilt | Change after 15° tilt |
|---|
Hemodynamic measures |
HR (beats/min) | 66 (54–85) | 68 (54–84) | 0 (− 2–6) |
SBP (mmHg)b | 115 (88–136) | 117 (86–132) | 3 (− 8–29) |
DBP (mmHg)b | 67 (48–78) | 70 (59–86) | 1 (− 8–16) |
MAP (mmHg)b | 78 (58–96) | 80 (66–104) | 2 (− 8–22) |
EDI | 51 (37–72) | 48 (38–66) | −4 (− 8–2)† |
SI (ml/m2) | 32 (23–42) | 30 (23–39) | −3 (− 6–0)† |
CI (l/min/m2) | 2.3 (1.5–3.5) | 2.0 (1.6 (3.2) | − 0.1 (− 0.4–0.1)† |
TPRI (mmHg/l/min/m2) | 11 (8–24) | 14 (8–24) | 2 (− 2–4)† |
Frequency domain measures |
PSD RRI | 444 (16–30,059) | 514 (46–22,462) | −8 (− 7612–8015) |
LFnuRRI | 27 (11–61) | 31 (9–65) | 4 (− 28–16) |
HFnuRRI | 73 (39–89) | 69 (35–91) | −4 (− 16–28) |
LFabsRRI (ms2) | 91 (5–11,813) | 115 (10–11,579) | 4 (− 234–860) |
HFabsRRI (ms2) | 158 (8–14,150) | 233 (12–11,365) | 3 (− 2784–7071) |
LF/HF ratio | 0.4 (0.1–1.6) | 0.5 (0.1–1.9) | 0.1 (− 0.7–0.8) |
Time domain measures |
SDNN (ms) | 28 (8–227) | 28 (13–174) | −5 (− 54–16) |
pNN50 (%) | 3 (0–68) | 3 (0–86) | 0 (− 16–18) |
RMSSD (ms) | 22 (7–151) | 30 (19–43) | 7 (− 120–23) |
BRS (ms/mmHg) | 6 (3–53) | 7 (3–55) | 1 (− 10–31) |
- HUT = Head-up tilt test; HR = heart rate; SBP, DBP and MAP = systolic, diastolic and mean blood pressure respectively; SI = stroke index; CI = cardiac index and TPRI = total peripheral resistance index (Indexed values are stroke volume; cardiac output and total peripheral resistance divided by body surface area); EDI = End diastolic volume index; LFnuRRI and HFnuRRI = low frequency and high frequency power in normalized units; LF or HF/(Total Power-VFL(very low frequency) × 100; LFabsRRI and HFabsRRI = power in high frequency and low frequency range in absolute values, respectively; LF/HF = ratio low frequency power/high frequency power; SDNN = Standard Deviation of all NN intervals; pNN50 = NN50 count divided by the total number of all NN intervals; NN50 = number of interval differences of successive NN intervals greater than 50 ms; RMSSD = Root of the Mean of the Sum of Squares of Differences between adjacent NN intervals; NN intervals = normal-to-normal intervals; BRS = Baroreceptor reflex sensibility
- †p < 0.001, Wilcoxon signed rank test
- aValues are medians (total range) obtained from registration during sequences of four minutes at rest and tilt to 15°, and changes from rest after tilt to 15°
- bBP-recordings are missing in 1 patient with no delirium
