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Relationship between the semiquantitative shunt grading and the width of the gap
| d ≤ 1 mm | 1 mm < d ≤ 2 mm | d > 2 mm | Total | |
|---|---|---|---|---|
| I | 10 | 16 | 1 | 27 |
| II | 1 | 7 | 3 | 11 |
| III | 3 | 7 | 0 | 10 |
| Total | 14 | 30 | 4 | 48 |
I: 1–10 hits small shunt; II: 10–25 hits medium shunt; III: >25 hits including “curtain” effect; d: the width of gap between the valve of foramen ovale and the atrial septum (unit: mm).
p = 0.032, p deviation = 0.03.
