Fluid In the Cat's Heart-Pericardial Effusion

What about fluid in the heart? That is known as pericardial effusion, caused by pericarditis, which is an inflammation of the pericardium, a double-layered membrane sac that surrounds the heart. This is NOT the same as CHF but it can lead to CHF. Pericardial effusion affects the right side of the heart more, compressing and restricting, and damaging the heart. The lower heart rate means the heart cannot be strong enough to pump fluid in and out, leading to the fluid backing into the lungs causing CHF. Fluid retention throughout the body typically follows ascites, swelling of the limbs, and weakness or collapse. While PE is possible, it is not always present or the cause of CHF in a typical pet.

Symptoms include those for any HCM issue or other disease:

Lethargy
Vomiting
Anorexia
Pale gums
Abdominal distention
Exercise intolerance
Fainting or collapse
Respiratory distress
Increased breathing rate and/or increased heart beat rat