Is fluid on the lungs and heart terminal?

Not necessarily: But aggressive investigation of the cause and appropriate treatment are very important.

No: This not terminal and is often treatable. The question is what is causing fluid on the lungs? This is usually a separate process from pericardial effusion. Echocardiography will provide important information about heart strength and valvular function. Treatment for pulmonary edema involves diuretics in addition to other potential medications.