The following data are gathered during a PEEP study (FIO₂ = 0.60). Based on these data, what is the optimum PEEP level? $\begin{array}{|l|l|l|l|l|l|l|} \hline \mathrm{PEEP} \mathrm{cm} \mathrm{H} \mathrm{H}_{2} \mathrm{O} & 0 & 5 & 10 & 15 & 20 & 25 \ \hline \mathrm{PaO}_{2} \mathrm{~mm} \mathrm{Hg} & 46 & 54 & 67 & 73 & 75 & 74 \ \hline \text { Compliance } \mathrm{m} / \mathrm{cm} \mathrm{H}_{2} \mathrm{O} & 18 & 23 & 26 & 30 & 24 & 19 \ \hline \text { Systolic pressure } & 125 & 123 & 114 & 115 & 104 & 94 \ \hline \text { Diastolic pressure } & 90 & 88 & 83 & 84 & 76 & 68 \ \hline \end{array}$

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The optimum PEEP level is chosen based on the best balance of improved oxygenation (PaO2), lung compliance, and minimal adverse effects on hemodynamics (systolic and diastolic pressures). At 15 cm H2O, PaO2 is significantly improved from baseline without a substantial drop in blood pressures, and compliance is at its highest, indicating improved lung function and less work of breathing.

The Following Data Are Gathered During a PEEP Study (FIO2

The Following Data Are Gathered During a PEEP Study (FIO₂