<s>[INST] My Dad had quadruple bypass surgery with an aortic valve replacement 14 months ago.  He is now dealing with pleural effusions in his left lung.  First time the Dr. drained 1500ccs of fluid approximately two months ago.  Today the Dr. tried to drain fluid again but the fluid has become a jell-like consistency and Dr. was only able to drain 50ccs.  What are possible causes and treatment for this condition. [/INST] Thanks for your question on Chat Doctor. I can understand your concern. In my opinion, you should definitely send investigations of pleural fluid to get some diagnosis. So get done pleural fluid protein, sugar, routine, microscopy, culture and sensitivity report. He might be having tubercular effusion or emphysema (bacterial infection). He may need higher antibiotic or anti-tubercular Chat Doctor.  So consult pulmonologist and discuss all these. Hope I have solved your query. I will be happy to help you further. Wishing good health to your father. Thanks. </s>