Respiratory Therapist going to Nursing School

I have been in Respiratory for 15 years. Whew! How did that time fly by so quick is beyond me!
I have a question for all of you nurses out there. I'd like to know the most common diseases you deal with in the hospitals (other than pneumonia, asthma, COPD, or other Respiratory issues), what lab values do you look at the most - and why (other than ABG's), what drugs are the most common - and what diseases are they used for? Anybody up to educating a bit? Feel free.