Intravenous Nitrite Infusion for Reversal of Cerebral Vasospasm After Subarachnoid Hemorrhage

This is a pilot single center, open-labeled study. Patients with subarachnoid hemorrhage
admitted to the hospital and who meet entry criteria will be offered enrollment into the
study. The patients will be enrolled promptly after detection of the presence of cerebral
vasospasm. Subjects will receive sodium nitrite infusion.

One dose cohort is planned, 64 nmol/min/kg sodium nitrite (0.1325 mg/hour/kg; 0.0442
ml/hour/kg at a concentration of 3mg/ml).

Inclusion Criteria:

- Informed consent obtained from a patient or legal representative before enrollment;

- Admission to hospital following subarachnoid hemorrhage;

- Aneurysm confirmed by digital subtraction angiography or CT-angiography after
admission;

- Development of the clinical symptoms and /or signs of cerebral vasospasm and
CT-angiography results warranting cerebral angiography.

Exclusion Criteria:

- Rupture of a fusiform, traumatic, or mycotic aneurysm;

- Pregnancy (confirmed by a serum human chorionic gonadotropin pregnancy test) or breast
feeding;

- Methemoglobin > 2%

- History of sickle cell disease, thalassemia, or other hemoglobinopathy;

- Anemia with hemoglobin level less than 6 g/dL;

- Significant acute or chronic concomitant diseases (including renal, hepatic,
cardiovascular, pulmonary, or oncologic disease, sepsis, pulmonary edema, pulmonary
embolism) that would be inconsistent with survival for at least 6 months;

- History of allergy to nitrites or allergy to other substances that could interfere
with nitrite metabolism, within 30 days before screening;

- History of red blood cell glucose-6-phosphate dehydrogenase (G6PD)deficiency;

- Treatment with allopurinol, a medication that could interfere with nitrite metabolism,
within 30 days before screening;

- Other investigational drug within the past 30 days;

- other cerebral injury within the past 30 days including previous subarachnoid
hemorrhage, stroke, transient ischemic attacks (TIA), concussion, head trauma, cranial
surgery, radiation therapy to the head.