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Table 3 Spectral and symbolic analysis among patients who reached clinical stability within 7 days vs. after 7 days from hospital admission

From: Cardiovascular autonomic alterations in hospitalized patients with community-acquired pneumonia

  TCS ≤7 days n = 48 TCS >7 days n = 27 p p*
Parameters, n. (%)
 Heart rate, median (IQR) bpm 79 (70–89) 81 (72–96) 0.305 0.712
Spectral analysis
 Total power, median (IQR) ms2 233 (105–433) 94 (59–214) 0.002 0.001
 VLF, median (IQR) ms2 87 (11–211) 20 (0–66) 0.001 0.003
 LFnu, median (IQR) 32 (15–63) 30 (4.3–68) 0.611 0.823
 HFnu, median (IQR) 43 (14–57) 36 (12–63) 0.795 0.823
 LF/HF, median (IQR) 0.97 (0.25–2.4) 0.78 (0.06–6.9) 0.497 0.618
 HF Hz, median (IQR) 0.30 (0.27–0.34) 0.34 (0.29–0.42) 0.041 0.106
Symbolic analysis
 0V, median (IQR) % 28 (16–48) 18 (10–30) 0.026 0.059
 1V, median (IQR) % 41 (34–46) 37 (31–49) 0.732 0.674
 2LV, median (IQR) % 3.7 (1.7–6.7) 6.7 (3.6–11.7) 0.041 0.149
 2UV, median (IQR) % 20 (12–35) 32 (18–45) 0.017 0.092
  1. * after adjustment for the presence vs. absence of severe CAP on hospital admission
  2. n. number, IQR 25–75 interquartile range, TCS time to clinical stability, bpm beats per minute, ms 2 milliseconds2, VLF very low frequency, LF low frequency, HF high frequency, nu normalized units, Hz Hertz