Vertebral artery hypoplasia: a predisposing factor for posterior circulation stroke?

Area of Science:

• Neurology
• Vascular Medicine
• Radiology

Background:

• Cerebrovascular diseases, particularly stroke, represent a significant global health burden.
• The posterior circulation is supplied by the vertebral arteries, making their anatomical variations potentially relevant to stroke etiology.
• Vertebral artery hypoplasia (VAH) is a congenital narrowing of the vertebral artery.

Purpose of the Study:

• To investigate the association between vertebral artery hypoplasia (VAH) and the territory of first-ever ischemic stroke.
• To determine if VAH is more prevalent in patients with posterior circulation infarction compared to other stroke territories.

Main Methods:

• A cohort of 725 first-ever stroke patients was analyzed.
• Color-coded duplex flow imaging was used to assess the V2 segment of the vertebral arteries.
• Vertebral artery hypoplasia was defined as a diameter less than or equal to 2.5 mm.

Main Results:

• Vertebral artery hypoplasia (VAH) was identified in 13% of patients with posterior circulation infarction.
• In contrast, VAH was found in only 4.6% of patients with strokes in other territories.
• This difference in VAH prevalence between stroke territories was statistically significant (p < 0.001).
• Common stroke risk factors (hypertension, hyperlipidemia, diabetes, smoking) showed no significant difference in distribution between the groups.

Conclusions:

• Patients with vertebral artery hypoplasia (VAH) appear to have a predisposition to stroke within the posterior circulation territory.
• VAH may be an independent risk factor for posterior circulation stroke.
• Further research is warranted to elucidate the mechanisms underlying this association.