Figure 1. Minute ventilation during active compression-decompression resuscitation without intermittent positive pressure ventilation. One minute after beginning of active compression-decompression, median minute ventilation is within the normal range of pigs weighing 25 kg (2.6–6.5 l/min), whereas 7 min after beginning of active compression-decompression, median minute ventilation is below this range. Filled circles indicate median minute ventilation.