What EKG finding indicates pericardial effusion?

The presence of low voltage QRS complexes and ST segment alterations is indicative of pericardial effusion on an EKG. In cases of pericardial effusion, there is a fluid accumulation in the pericardial space, which can dampen the electrical signals from the heart. This results in low amplitude or low voltage QRS complexes when measured across the leads. Additionally, the fluid can also influence the position and configuration of the ST segments, leading to alterations that might include depression or elevation in certain leads.

This finding is significant because it helps differentiate pericardial effusion from other cardiac conditions that may present similarly. For instance, other cardiac issues might show elevated voltages or clear changes in ST segments, but low voltage along with the specified alterations is a hallmark of fluid around the heart, thus aiding in prompt diagnosis and management.