Dr. Jones is not online
I am also an ER doctor
would you like me to help you?
Did they do a CT of the chest?
I don't see that you are on line.
Other things which can cause shortness of breath and stiff lungs would be severe pulmonary fibrosis
Interstitial lung disease
You can also have shortness of breath and code following a blood clot in the lungs- called a pulmonary embolism
Severely infected lungs can give you a stiff appearance and so can conditions like hemachromatosis (deposition of iron into the lung tissue)
Having a CT of the chest would be most helpful
I am really sorry for your loss
You can also have severe heart failure secondary to endocarditis (infection) which can cause fluid to back up into the lungs and multisystem organ failure.
I hope that this was somewhat helpful
Getting an autopsy would be important if they cause of death is still not clear by tomorrow.
My thoughts are with you and your family
I hope that this helped.
Please leave positive feedback if it did..