If the fluid is in your father’s lungs, as water is held in a sponge, then the most likely cause is heart failure, either with or without a heart attack and some heart attacks can be silent. This type of fluid accumulation must be treated with medicines to cause the heart to beat more strongly and other medicines to make the kidneys pass more water out.
If the fluid surrounds one or both lungs, there are many causes including infection, tumors and failure of not only the heart, but also failure of the liver or kidneys. This type of fluid collection can be treated with quick relief in the short term by removal of the fluid with a needle or
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Bladder catheterization, female
Bladder catheterization, male
Cardiac catheterization
External incontinence devices
Left heart catheterization
Left heart ventricular angiography
Urinary catheters
Urine culture - catheterized specimen. That can also help to make a diagnosis of what caused the fluid in the
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If his doctor cannot quickly give you an explanation for why your father has fluid in his lungs, then you should request that he be seen by a heart or lung specialist, without delay.
Good luck.