Subarachnoid Hemorrhage (SAH) | 合法醫療器材資訊網

SubarachnoidHemorrhage(SAH)...Subarachnoidhemorrhageissuddenbleedingintothesubarachnoidspace.Themostcommoncauseofspontaneous​ ...

Usually noncontrast CT and, if negative, lumbar puncture

Diagnosis of subarachnoid hemorrhage is suggested by characteristic symptoms. Testing should proceed as rapidly as possible, before damage becomes irreversible.

Noncontrast CT is done within 6 hours of symptom onset. When done within this time frame, this test has very high sensitivity. Therefore, if this test does not detect a subarachnoid hemorrhage, no other testing is needed as long as patients have a normal physical examination, no meningeal signs, and no anemia, MRI is comparably sensitive but less likely to be immediately available. False-negative results occur if volume of blood is small or if the patient is so anemic that blood is isodense with brain tissue.

CSF findings sugges...