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Table 2 Average delivered oxygen per model at 30, 60 and 90 s during simulated spontaneous breathing

From: Large variations of oxygen delivery in self-inflating resuscitation bags used for preoxygenation - a mechanical simulation

  Time 30 s
O2 [%]
Time 60 s
O2 [%]
Time 90 s
O2 [%]
Ambu Oval Plus 95.4 (95.1–95.8)a 99.2 (99.1–99.2)a 99.5 (99.4–99.5)a
Ambu Spur II 96.1 (95.7–96.5)a 99.6 (99.5–99.7)a 99.8 (99.8–99.9)a
Intersurgical 76.5 (75.3–77.6) 76.3 (75.3–77.4) 76.7 (75.5–77.9)
Laerdal Silicone 92.9 (92.4–93.4) 96.9 (96.7–97.1) 97.3 (97.1–97.5)
Laerdal The Bag II 91.2 (90.7–91.7) 94.4 (94.0-94.9) 94.5 (94.0–95.0)
O-Two Smart Bag 36.8 (36.4–37.3) 38.4 (38.1–38.8) 39.0 (38.7–39.3)
  1. System averages were calculated for 5 s (-2 to + 2 s) for the nine recordings of each model (total n = 54). All differences, for each time set, were statistically significant apart from the two Ambu systems (a). Means (95 % CI)