How should an effusion be measured in the cardiac cycle?

Measuring an effusion during diastole is crucial because this phase provides the most accurate assessment of the pericardial space while the heart is in a relaxed state. During diastole, the heart chambers and surrounding structures are less compressed, allowing for a clearer view of any fluid accumulation. This makes it easier to visualize the effusion’s size and location, as the heart's movements during systole can create artifacts that obscure the image.

Opting for diastolic measurements helps in accurately assessing the impact of the effusion on the cardiac function, as the heart's pressure dynamics differ significantly between systole and diastole. Understanding this timing ensures that the sonographer can obtain the necessary data to evaluate potential impacts on the heart's filling and ejection capabilities.