Age

18–75

Sex

ALL

Healthy volunteers

Not accepted

1. age 18-75 years of age (including 18 and 75 years), gender, ethnic limitation;
2. have been carried out invasive intracranial pressure monitoring;
3. the patient or his agent informed consent. -

1. the patient does not fit, measured by TCD can not be completed;
2. TCD failed to detect the satisfaction of the ophthalmic artery flow signals were;
3. patients with ocular trauma or a history of intraocular pressure -

TCD Detection of Ophthalmic Artery Blood Flow Velocity Prediction Feasibility Study of Intracranial Pressure