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Performance Characteristics of the Traditional Upper Reference Limit for the LVAD Outflow Cannula Peak Velocity Compared With the Proposed New Reference Limits
| Characteristic | Traditional Reference Limit (2 m/s) | Proposed Reference Limit (2.7 m/s for HM2; 3.4 m/s for HVAD) |
|---|---|---|
| False positives, n | 24 | 0 |
| True positives, n | 4 | 4 |
| False negatives, n | 0 | 0 |
| True negatives, n | 26 | 50 |
| Sensitivity, % | 100 | 100 |
| Specificity, % | 52.0 | 100 |
| Negative predictive value | 100 | 100 |
| Positive predictive value | 14.3 | 100 |
