Hi @lindalee88,
The fluid buildup was in the pericardial sac, not my lungs. I had to get it drained. It's a common complication.
I did have full-on open heart surgery. My sternum was cracked open.
You will be monitored very closely for any complications.
Maybe ask your doctor what precautions s/he will take with respect to your lungs.
When you go home, don't over exert yourself. Have support in place if you can.
They did get me walking a day or two after surgery.