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Grade of transient right to left shunting based on microembolic signals grading score
| Grade transient shunt | MES |
| No shunt | 0 |
| Low grade shunt | 1-10 |
| Moderate grade shunt | 11-25 |
| High grade shunt | > 25 (shower) or uncountable (curtain effect) |
MES: Microembolic signals.
