Higher hemoglobin is associated with less cerebral infarction, poor outcome, and death after subarachnoid hemorrhage

OBJECTIVE: Higher-goal hemoglobin (hgb) and more packed red blood cell transfusions lead to worse outcomes in general critical care patients. There are few data on hgb, transfusion, and outcomes after aneurysmal subarachnoid hemorrhage (SAH). METHODS: We reviewed the daily hgb levels of 103 patients with aneurysmal SAH. Cerebral infarction was diagnosed by computed tomographic scan. We corrected for Hunt and Hess grade, age, and angiographic vasospasm in multivariate models. RESULTS: Of 103 patients, the mean age was 55.3 ± 14.5 years, 63% were women, and 29% were Hunt and Hess Grades 4 and 5; hgb values steadily declined from 12.6 ± 1.7 g/dl the day of SAH to 10.4 ± 1.2 g/dl by Day 14. Patients who died had lower hgb than survivors on Days 0, 1, 2, 4, 6, 10, 11, and 12 (P ≤ 0.05). Higher mean hgb was associated with reduced odds of poor outcome (odds ratio, 0.57 per g/dl; 95% confidence interval [CI], 0.38-0.87; P = 0.008) after correcting for Hunt and Hess grade, age, and vasospasm; results for hgb on Days 0 and 1 were similar. Higher Day 0 (odds ratio, 0.7 per g/dl; 95% CI, 0.5-0.99; P = 0.05) and mean hgb (odds ratio, 0.57 per g/dl; 95% CI, 0.38-0.87; P = 0.009) predicted a lower risk of cerebral infarction independent of vasospasm. There were no associations between hgb and other prognostic variables. CONCLUSION: We found that SAH patients with higher initial and mean hgb values had improved outcomes. Higher hgb in SAH patients may be beneficial. The efficacy and safety of blood transfusions to increase hgb in patients with SAH may warrant further study.