<s>[INST] my dad passed yesterday, 16 days ago he survived open heart surgery which included a valve replacement quad bypass and aorta streghthening, he was released to a rehab facility and was doing well they took him to hospital for a chest x ray and blood work, he became unconsious and passed away from fluid in and aruond the lungs my question is could this have been prevented? [/INST] Hello derisory to listen about the loss of your dad, may his soul rest in peace. Warm welcome to Chat Doctor.come have evaluated your query thoroughly.* The fluid around lungs may have different issues - fluid overload - lung infection - septicemia - cardiac issue with secondary event - others.* So far as the prevention question is concerned, it requires in depth case study with series of evaluation, one of which require postmortem. Hope this clears your query. Regards. </s>