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Table 2 Autonomic parameters evaluated by both spectral and symbolic analysis in patients with community-acquired pneumonia (CAP) and controls

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

  CAP patients n = 75 Controls n = 26 p
Parameter
 Heart rate, median (IQR) bpm 80 (71–92) 68 (60–73) 0.006
Spectral analysis
 Total power, median (IQR) ms2 159 (79–368) 522 (335–1760) <0.001
 VLF, median (IQR) ms2 49 (0–121) 262 (99–983) <0.001
 LFnu, median (IQR) 32 (11–63) 56 (37–75) 0.008
 HFnu, median (IQR) 42 (13–59) 41 (22–55) 0.935
 LF/HF, median (IQR) 0.92 (0.23–2.6) 1.3 (0.73–3.1) 0.120
 HF Hz, median (IQR) 0.31 (0.27–0.37) 0.29 (0.26–0.33) 0.096
Symbolic analysis
 0V, median (IQR) % 26 (13–38) 30 (12–46) 0.451
 1V, median (IQR) % 39 (33–47) 44 (38–49) 0.077
 2LV, median (IQR) % 4.4 (2.2–8.5) 6.0 (3.5–12) 0.164
 2UV, median (IQR) % 24 (12–41) 17 (12–24) 0.020
  1. n. number, IQR 2575 interquartile range, bpm beats per minute, ms 2 milliseconds2, VLF very low frequency, LF low frequency, HF high frequency, nu normalized units, Hz Hertz