Pericardial effusion can potentially lead to reduced urine output. This occurs because in patients with pericardial effusion, the diastolic function of the heart is restricted, limiting the blood volume during the diastolic phase. This, in turn, reduces the amount of blood pumped by the heart during the systolic phase, ultimately leading to ischemia. To ensure the blood supply to vital organs like the brain, the heart reduces its blood supply, impacting the glomerular filtration rate, and thus symptoms of reduced urine output can occur. Additionally, symptoms such as limb edema, shortness of breath, respiratory difficulties, and chest tightness often accompany these. As pericardial effusion can cause congestion in the gastrointestinal tract, some patients may also experience abdominal distension, nausea, and vomiting among other digestive symptoms. A pericardial effusion ultrasound can definitively diagnose a pericardial effusion.