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Why would CPAP be contraindicated? I know it increases intrathoracic pressures and reduced preload, but in this particular case, that could be a good thing. Sounds to me like he's in shock as a result of acute hypoxemia secondary to the CHF. The Digoxin will prevent any compensatory tachycardia. CPAP would have been my goto as I did an IV NS bolus and prepped a Norepi infusion in the event that CPAP was not sufficient in reducing respiratory workload and improving the hypoxia.