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Duplex characteristics of patients screened with Duplex in the pre-operative period divided into those that had improvement and those that did not.
| MEAN PSV (cm/s) | MEAN PSV WITH INSP. (cm/s) | MEAN CHANGE IN PSV WITH RESPIRATION (cm/s) | MEAN PSV:AORTIC RATIO | |
|---|---|---|---|---|
| Improvement (n=31) | 387±33 | 203±15 | 185±22 | 2.2±0.1 |
| No improvement (n=15) | 369±27 | 186±14 | 171±20 | 2.2±0.2 |
PSV: Peak systolic velocity; EDV: end diastolic velocity; Insp: Inspiration; CM/S: centimeter/second)
