A post-cardiopulmonary resuscitation (CPR) patient who has been initiated on positive pressure ventilation (PPV) begins to decompensate. What should be the immediate course of action?

A) Administer an additional dose of epinephrine
B) Increase the rate of chest compressions
C) Perform a rapid assessment for reversible causes
D) Continue PPV at the current settings
E) Administer a bolus of crystalloid fluids