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Table 2 Descriptive data for all patients (n = 14) during supine rest and HUT to 15° a

From: Autonomic cardiovascular control in older patients with acute infection and delirium: a pilot study of orthostatic stress responses

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)
  1. 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
  2. p < 0.001, Wilcoxon signed rank test
  3. 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°
  4. bBP-recordings are missing in 1 patient with no delirium