Metoprolol in Acute Respiratory Distress Syndrome (MAIDEN)

"A dilution of 15 mg Metoprolol tartrate in 100 ml saline shall be performed and infused for 10 minutes. No dose reduction or increase is allowed. Systolic blood pressure and heart rate shall be measured 3 and 6 minutes after starting the infusion.~In case of a consistent drop in systolic blood pressure or heart rate, the infusion shall be stopped and the infusion noted."

"A dilution of 0.9% sodium chloride in 100 ml saline shall be performed and infused for 10 minutes. No dose reduction or increase is allowed. Systolic blood pressure and heart rate shall be measured 3 and 6 minutes after starting the infusion.~In case of a consistent drop in systolic blood pressure below 110 mmHg or heart rate below 60 bpm, the infusion shall be stopped and the infusion noted."