CT Angiogram to Identify Source of Subarachnoid Hemorrhage

Rationale for Urgent Vascular Imaging

• The American Heart Association states that there is a high early risk for rebleeding in SAH patients, with mortality rates exceeding 40% within 30 days, making immediate identification of the bleeding source critical for survival 1, 3
• Patients with aneurysmal SAH should have the aneurysm secured urgently by endovascular coiling or microsurgical clipping, ideally within 24 to 48 hours, as recommended by the International Journal of Stroke 2

CTA as the Preferred Initial Vascular Imaging

• High-quality CTA is initially preferable to catheter angiography for investigating the cause of hemorrhage, according to the International Journal of Stroke 1, 2
• The American Heart Association states that CTA may help guide the decision for type of aneurysm repair, though catheter angiography remains the gold standard if CTA is inconclusive 7, 8

Critical Next Steps After CTA

• Urgent neurosurgical consultation should occur simultaneously with vascular imaging, as recommended by the International Journal of Stroke 1, 3
• If CTA identifies an aneurysm amenable to both coiling and clipping, endovascular coiling should be considered as the preferred approach, according to the International Journal of Stroke and Stroke 2, 7