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Criteria for moderate-severe pulmonary regurgitation.
| Parameter | Abnormality threshold |
|---|---|
| Pulmonary regurgitation PHT | <100 ms |
| Jet:Annulus width ratio | 0.5 |
| Diastolic flow reversal from the branch pulmonary arteries | From branch PAs |
| Termination of flow in mid-late diastole | No flow time >80 ms. |
PA, pulmonary artery; PHT, pressure half time.
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