In this report. we present a five-month-old female patient with a diagnosis of idiopathic pulmonary arterial hypertension (IPAH). This patient was accepted by our clinic after a sudden deterioration in her clinical condition. We performed echocardiography and observed a 17 mm pericardial fluid near the left ventricle posterior wall. https://www.roneverhart.com/Apple-Watch-Series-6-GPS-Cellular-40mm-Silver-Aluminum-w-White-Sport-Band/