<prompt> When can one diagnose acute respiratory distress in a child?Within 7 days of known insultRespiratory failure not fully explained by cardiac failureNo left ventricular dysfunctionAll of the above  <response>: Diagnostic criteria of ARDS in children: BERLIN DEFINITION CRITERIA Timing Within 1 wk of a known clinical insult or new or worsening respiratory symptoms Chest X-rays or tomography scan Bilateral opacities not fully explained by effusions, lobarlung collapse, or nodules Origin of edema Respiratory failure not fully explained by cardiac failure or fluid overload Oxygenation Mild: PaO2FiO2 - 200-300 mm Hg Moderate: PaO2FiO2 - 100-200 mm Hg Severe: PaO2FiO2 100 mm Hg 