Diagnosis value of cerebral vasospasm by transcranial Doppler ultrasound compared with brain multislide computerized tomography showded 94% of sensitivity (95% CI: 81.4% - 98.4%); specificity: 94% (95% CI: 85.7% - 98.2%); the positive predictive value: 92% (95% CI: 78.2% - 97.1%); the negative predictive value: 96.5% (95% CI: 88% - 97.7%).