You have 3 ill patients in the intensive care unit.  Which of the
following three patients is going to be the most diffiuclt to provide
adequate tissue oxygenation to?  Provide a rationale based on anatomy
and physiology for your decision.

patient 1:  30 year old diabetic patient with diabetic keto-acidosis
(dka):  pH 7.01/pCO2 10/PO2 90/FIO2 .21/temp 96.9 oral.  Respiratory
rate 40 breaths/minute.

patient 2:  22 year old patient in status asthmaticus:  pH 7.01/pCO2
80/pO2 40/FIO2 .21/temp 98.6 oral.  respiratory rate 40
breaths/minute.

patient 3:  50 year old patient with urosepsis:  pH 7.01/pCO2 25/pO2
70/FIO2 .21/temp 103.5 oral.  respiratory rate 40 breaths/minute.