Table 4. Accuracy of optimal thresholds for ischemic core (major reperfusion group).
Threshold (within delay time ≥ 3 s) | Youden’s Index | Sensitivity | Specificity | Mean magnitude (ml) | r | P value |
---|---|---|---|---|---|---|
rCBF ≤ 30% | 0.40 | 0.64 | 0.76 | 10.8 | 0.881 | < 0.001 |
CBF ≤ 6 ml/100 g/min | 0.36 | 0.55 | 0.81 | 19.4 | 0.716 | < 0.001 |
rCBV ≤ 50% | 0.27 | 0.49 | 0.78 | 24.7 | 0.530 | < 0.001 |
CBV ≤ 1 ml/100 g | 0.26 | 0.40 | 0.86 | 22.5 | 0.566 | < 0.001 |
Delay time ≥ 7 s | 0.28 | 0.57 | 0.71 | 17.6 | 0.752 | < 0.001 |
rMTT ≥ 200% | 0.20 | 0.53 | 0.66 | 18.4 | 0.743 | < 0.001 |
MTT ≥ 13 s | 0.20 | 0.41 | 0.79 | 27.0 | 0.348 | 0.017 |
More data in supplemental material.
CBF, cerebral blood flow; CBV, cerebral blood volume; MTT, mean transient time.