Fig. 3

Effects of lung transplant on cardiac autonomic modulation in supine position evaluated at three different time points. Total power represents the global heart rate variability (the sum of VLF, LF and HF spectral components); the squared coherence function at high frequencies between breath rate and heart rate (RR-RESP HFk2) represents the cardiorespiratory coupling that ranges from 0 (no correlation) and 1 (highest correlation); 0 V(%) represents sympathetic contribution; 2UV(%) and 2LV(%) represent autonomic parasympathetic contribution; corrected conditional entropy (CE) represents the predictability of R-R intervals (i.e., low predictability = high sympathetic modulation); Index of regularity (Ro) is derived from CE and could range from 0 to 1 (high regularity = low complexity and high sympathetic modulation); bpm: beats per minute; ms: milliseconds; T0: baseline, before lung transplant; T1: 15 days after lung transplant; T2: 6 months after lung transplant. α < 0.05