Pericardial effusion ... Only one prior report mentions PCE with appropriately placed UVC. 2 Use of basic ultrasound skills for neonatal clinical staff is ... Arch Dis Child Fetal Neonatal ed ...

An ultrasound of your heart (echocardiogram), which can show the size of the effusion and if there's any evidence of cardiac tamponade. This is the best test to confirm a pericardial effusion.