Figure 4 From: Fluctuations of inspired concentrations of nitric oxide and nitrogen dioxide during mechanical ventilation Differences in nitric oxide (NO) concentrations between differentpositions as a percentage of the adjusted NO dose (y-axis) for the differentsetups of the heating system (x-axis). The different bars reflect the differentmeasurement positions (see Fig 1). Data are given asmean ± standard deviation. *P < 0.05, compared to theactive humidification system (acthum). inacthum, inactive humidificationsystem; nohum, no humidification system.Back to article page