Massachusetts General Hospital
The goal of this observational study is to understand if angiographic cerebral vasospasm (CV) can be predicted by levels of nitric oxide (NO) consumption in patients with aneurysmal subarachnoid hemorrhage (SAH). To reach this goal, the investigators will compare NO consumption levels in SAH and non-SAH patients. NO consumption levels will be analyzed from samples of participants' cerebral spinal fluid (CSF).
After enrollment, the investigators will collect patients' demographics and most relevant clinical characteristics of the patients. For patients with SAH, the investigators will collect an-1 ml aliquot of CSF from the drainage circuit daily, (using a sterile procedure that involves a valve of the closed system circuit located distally to the patient, before the collection container), for a period of 15 days following SAH. The samples will be stored at -80 degrees. The investigators will perform daily Transcranial Doppler (TCD) monitoring to assess whether the patients have cerebral vasospasm…
Inclusion Criteria: * Adult * patient with SAH and with an external ventricular drainage (EVD) placed within 24 hours after the onset of the hemorrhage Exclusion Criteria: * pregnancy * pre-existing neurological comorbidities * coagulation disorders * anemia * absence of a good cranial window to perform Transcranial Doppler (TDC) * presence of \>50% stenosis of carotid arteries confirmed by doppler ultrasound * Technical problems on EVD that prevent CSF withdrawals For the control group, we will invite to participate patients without neurological comorbidities undergoing spinal anesthesia…
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