Table 3. Correlation between semi-quantitative and quantitative CT perfusion (CTP) Alberta Stroke Program Early CT Score (ASPECTS) and final infarct volume as measured on NCCT at 7 days after symptom onset in 62 acute ischemic stroke patients considered as a whole (total patients) and grouped according recanalization and reperfusion levels.
| Total patients (n = 62) | Recanalized (n = 45) | not recanalized (n = 17) | Reperfused (n = 25) | not reperfused (n = 37) | |
|---|---|---|---|---|---|
| Semi-quantitative CTP ASPECTS | |||||
| CBF | r = -0.582094; p<0.00001 | r = -0.500480; p<0.001 | r = -0.221318; p = 0.393 | r = -0.538078; p<0.01 | r = -0.438866; p<0.01 |
| CBV | r = -0.707869; p<0.00001 | r = -0.694085; p<0.00001 | r = -0.554911; p = 0.021 | r = -0.688623; p<0.02 | r = -0.682344; p<0.000001 |
| MTT | r = -0.531381; p<0.00001 | r = -0.431643; p<0.01 | r = -0.138321; p = 0.597 | r = -0.483270; p<0.02 | r = -0.349885; p = 0.034 |
| CTP mismatch | r = 0.113193; p = 0.381 | r = 0.001801; p = 0.991 | r = -0.360055; p = 0.156 | r = 0.102910; p = 0.624 | r = -0.082973; p = 0.625 |
| Quantitative CTP ASPECTS | |||||
| CBF | r = -0.568907; p<0.00001 | r = -0.422621; p<0.01 | r = -0.380731; p = 0.132 | r = -0.307668; p = 0.135 | r = -0.544224; p<0.001 |
| CBV | r = -0.566817; p<0.00001 | r = -0.621084; p<0.00001 | r = -0.543278; p = 0.024 | r = -0.506412; p<0.01 | r = -0.602951; p<0.0001 |
| MTT | r = -0.641047; p<0.00001 | r = -0.532585; p<0.001 | r = -0.419322; p = 0.094 | r = -0.479297; p<0.02 | r = -0.470496; p<0.01 |
| CTP mismatch | r = 0.313840; p<0.02 | r = 0.292660; p = 0.051 | r = -0.194174; p = 0.455 | r = 0.265259; p = 0.200 | r = 0.093855; p = 0.581 |
CBF = cerebral blood flow; CBV = cerebral blood volume; MTT = mean transit time; statistical analysis = Spearman's rank correlation coefficient.