- Small effusions - up to 100 ml - echo-free space less than 10 mm in thickness at its greatest width
- Moderate effusions - up to 500 ml - echo-free space up to 20 mm at its greatest width.
- Large effusions - more than 500 m - the echo-free space is greater than 20 mm at its greatest width.
All echo data should be read in close conjunction with clinical exams and hemodynamic data.
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