Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 1/2/2026

Immediate Diagnosis and Management of Acute Subarachnoid Hemorrhage

Imaging Diagnosis

Lumbar Puncture Indications

Clinical Presentation

Vascular Imaging After Positive CT

Early Management Priorities

Blood Pressure Control

Definitive Aneurysm Treatment

Common Pitfalls to Avoid

Imaging Recommendations for Suspected Aneurysmal Subarachnoid Hemorrhage in Trauma Settings

Vascular Imaging Indications

  • When a subarachnoid hemorrhage shows a diffuse pattern in the basal cisterns and Sylvian fissures, or when no clear traumatic mechanism can be identified, clinicians should obtain a CTA or DSA to exclude an underlying aneurysm. [1][2]

  • Any atypical hemorrhage distribution (e.g., predominant basal cistern involvement) or an incongruent mechanism of injury should prompt vascular imaging (CTA/DSA) to rule out an aneurysmal source. 2