Management of Fetal-Type Vertebral Arteries
Diagnostic Approach
- The American College of Cardiology recommends using MRA or CTA immediately to detect vertebral artery stenosis, achieving 94% sensitivity versus 70% for ultrasound 1, 3, 4.
- Catheter-based angiography should be obtained before any revascularization consideration to reliably delineate vertebral artery origins 1, 3, 5.
Medical Management
- The American College of Cardiology suggests that medical therapy follows identical guidelines as carotid artery disease and must be attempted before any revascularization 1, 2, 3.
- Aspirin 75-325 mg daily should be started immediately as first-line therapy for all patients with vertebral artery atherosclerosis 6, 7, 4.
- Extended-release dipyridamole 200 mg twice daily should be added to aspirin, which reduced vertebrobasilar territory stroke/TIA from 10.8% to 5.7% versus placebo 1, 7, 8.
Revascularization
- Revascularization should be pursued only when optimal medical therapy fails to control recurrent posterior circulation ischemic symptoms 7, 4.
- Endovascular treatment carries 0.3% mortality, 5.5% periprocedural neurological complications, and 0.7% posterior stroke risk at 14.2 months 5, 7, 8, 4.
- Restenosis occurs in 26% of proximal vertebral artery interventions at 12-month follow-up 5, 7, 4.
Long-Term Monitoring
- Indefinite antiplatelet therapy with aggressive cardiovascular risk factor modification should be continued following the same standards as extracranial carotid atherosclerosis 6, 7, 4.
- Serial noninvasive imaging should be performed at intervals similar to carotid revascularization to assess disease progression and exclude new lesions 6, 4.
- Patients should be monitored continuously for recurrent symptoms, as atheroembolism from vertebral artery origin lesions may cause brainstem or cerebellar infarction even when the contralateral vertebral artery is patent 7.