Objective To determine the distending pressure needed to achieve sufficient tidal volume (VT) delivery during continuous chest compressions (CC) superimposed by sustained inflation (SI) (CC+SI).
Design Randomised animal/manikin trial.
Setting University laboratory.
Subjects Cadaver piglets/manikin.
Interventions SI distending pressures of 5, 10, 15, 20, 25 and 30 cm H2O were delivered in random order during CC+SI for 2 min each.
Main outcome measures VT, gas flow and airway pressure. Spearman's r for distending pressure and VT.
Results Distending pressure and VT correlated in cadaver piglets (r=0.83, p<0.001), manikin (r=0.98, p<0.001) and combined data (r=0.49, p<0.001). VT was delivered during chest recoil during CC in both models. In cadaver piglets, a distending pressure ∼25 cm H2O was needed to achieve an adequate VT.
Conclusions Chest recoil generates VT depending on an adequate distending pressure. This has previously been demonstrated in adult animals. A pressure of ∼25 cm H2O is needed to achieve an adequate VT delivery.