Changes in regional ventilation during general anesthesia
RECRUITMENT
Analysis of the changes in regional ventilation during general anesthesia in healthy children showed that with increasing efforts of spontaneous breathing, from PCV over PSV to SB, the proportion of ventilation in ventral areas decreased by 5.5 percentage points, whereas regional proportion recruitment occurred in dorsal areas. Throughout the measurement period, the majority of ventilation occurred in mid regions 2 and 3. As expected, region 4 showed the smallest proportion of ventilation (Fig. During controlled ventilation, more ventral lung areas were ventilated. The change of the ventilation mode from controlled to pressure-supported had a small and only in ROI 1 significant influence on changes in ventilation distribution (Difference ROI 1: 1.7 percentage points; 95% CI, 0.59—2.8; Dorsal ROI 3 was ventilated 4.4 percentage points (95% CI, -6.2—-2.8; During pressure-supported ventilation, dorsal ROI 3 was ventilated 3.3 percentage points (CI 95%; -5.0—-1.7; The ventilation fraction of dorsal ROI 4 was very low, therefore the ventral two regions (ROI 1 and 2) and the dorsal two regions (ROI 3 and 4) were combined. Figure 