Cat who nearly died 3 years ago due to excess fluid in the chest cavity has the same thing again and the prognosis is bad. My girlfriend is unhealthily attached to the poor creature and passed out when the vet told us, I was barely able to catch her. Going for an echocardiogram tomorrow to see if we can find a definitive cause, if that doesn't show anything we're gonna drain and test the fluids. Going to be a horrible (and expensive) couple of days.