While the unit specializes in septic and respiratory compromised (COPD, PNA, Respiratory Failure) patients, nurses will encounter a variety of diagnoses, such as CHF, dysrhythmias, DKA, Hemodialysis and Peritoneal dialysis, AMS, etc. About the Unit: The Step-Down ICU, also known as 2F, is a 16-bed intermediate level of care unit between the Inpatient Units and the Critical Care units.