Absolute PMN count in patients with ACLE (n = 8) and ALI/ARDS without pneumonia (n = 10). The horizontal line represents the median. The box encompasses the 25th to 75th percentiles and the error bars show the 10th to 90th percentiles. Filled circles: outliers. The difference is non-significant. Sampling obtained by s-Cath. ACLE = acute cardiogenic lung oedema; ALI = acute lung injury; ARDS = acute respiratory distress syndrome; PMN = polymorphonuclear cell; s-Cath = suction catheter.