The nurse is assisting a client with CHF who is complaining…

The nurse is assisting a client with CHF who is complaining of shortness of breath while walking short distance and when lying down flat in bed. He is also complaining of palpitation. On physical exam he has rales in both lungs base to mid pulmonary fields, jugular distension, irregular- irregular cardiac rhythm. Laboratories BNP is in 800 pg/ml. What is the cause of the pulmonary edema in this case?