Review Article
Transcranial Doppler Ultrasound: A Review of the Physical Principles and Major Applications in Critical Care
Table 5
Cardiopulmonary shunt grading based on microembolic signals [
95,
97].
| Grade of shunt | Number of microembolic signals (MES) |
| No shunt | 0 | Low grade shunt | 1–10 | Medium grade shunt | 11–25 | High grade shunt | >25 (shower) or uncountable (curtain effect) |
|
|