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Background Driving pressure (∆P) is an important factor that predicts mortality in acute respiratory distress syndrome (ARDS). We test the hypothesis that serial changes in daily ΔP rather than Day 1 ΔP would better predict outcomes of patients with ARDS. Methods This retrospective cohort study enrolled patients admitted to five intensive care units (ICUs) at a medical center in Taiwan between March 2009 and January 2018 who met the criteria for ARDS and received the lung-protective ventilation strategy. ∆P was recorded daily for 3 consecutive days after the diagnosis of ARDS, and its correlation with 60-day survival was analyzed. Results A total of 224 patients were enrolled in the final analysis. The overall ICU and 60-day survival rates were 52.7% and 47.3%, respectively. ∆P on Days 1, 2, and 3 was significantly lower in the survival group than in the nonsurvival group (13.8 ± 3.4 vs. 14.8 ± 3.7,  p  = 0.0322, 14 ± 3.2 vs. 15 ± 3.5,  p  = 0.0194, 13.6 ± 3.2 vs. 15.1 ± 3.4,  p  = 0.0014, respectively). The patients were divided into four groups according to the daily changes in ∆P, namely, the low ∆P group (Day 1 ∆P &lt; 14 cmH 2 O and Day 3 ∆P &lt; 14 cmH 2 O), decrement group (Day 1 ∆P ≥ 14 cmH 2 O and Day 3 ∆P &lt; 14 cmH 2 O), high ∆P group (Day 1 ∆P ≥ 14 cmH 2 O and Day 3 ∆P ≥ 14 cmH 2 O), and increment group (Day 1 ∆P &lt; 14 cmH 2 O and Day  3  ∆P ≥ 14 cmH 2 O). The 60-day survival significantly differed among the four groups (log-rank test,  p  = 0.0271). Compared with the low ΔP group, patients in the decrement group did not have lower 60-day survival (adjusted hazard ratio 0.72; 95% confidence interval [CI] 0.31–1.68; p = 0.4448), while patients in the increment group had significantly lower 60-day survival (adjusted hazard ratio 1.96; 95% CI 1.11–3.44; p = 0.0198). Conclusions Daily ∆P remains an important predicting factor for survival in patients with ARDS. Serial changes in daily ΔP might be more informative than a single Day 1 ΔP value in predicting survival of patients with ARDS.

Maintenance of low driving pressure in patients with early acute respiratory distress syndrome significantly affects outcomes