Abstract

INTRODUCTION: Isolated traumatic subarachnoid hemorrhage (tSAH) is a common finding of mild traumatic brain injury that often results in the transfer to a tertiary center. This is often done out of concern for patients on blood thinners (BT) who are thought to be at higher risk of clinical worsening. METHODS: A retrospective analysis identified patients over the age of 18 with isolated tSAH and a GCS of 15 on admission. Clinical information including use of BT, administration of reversal agents, radiographic progression, and need for neurosurgical intervention were collected. Patients on BT were divided into AP, AC and AP/AC groups based on drug type. RESULTS: 384 patients were included with 203 in the non-BT group and 181 in the BT group. 2.1% had worsening scans and none required neurosurgical intervention. There was no difference in radiographic worsening between the non-BT and BT group (2.4% vs. 1.6%; p = 1.00). Crosswise comparison revealed no difference between the non-BT group and each BT subtype (AP, AP/AC, AC). The non-BT group was more likely to have radiographic improvement than the BT group (45.8% vs. 30.9%; p = 0.002). CONCLUSION: Neurologically intact patients on BT with isolated tSAH are not at increased risk of radiographic progression or need for neurosurgical management. Consequently, the presence of BT should not influence management decisions for increased surveillance.

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