Figure 2
From: Application of heart-rate variability in patients undergoing weaning from mechanical ventilation
Effect of spontaneous-breathing trial (SBT) and extubation on heart-rate variability. (A) Patients who failed SBT had a significant decrease in total power (TP) at the change from pre-SBT to SBT periods. (B) Patients with successful extubation had a significant increase in TP from SBT to postextubation periods. Values are presented in means. Asterisks indicate significant changes. ln, natural logarithm.