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Vertebral artery hypoplasia is associated with a decrease in net vertebral flow volume

Yen-Yu Chen1, A-Ching Chao, Hung-Yi Hsu

  • 1Department of Neurology, Changhua Christian Hospital, Changhua, Taiwan.

Ultrasound in Medicine & Biology
|November 11, 2009
PubMed

Insights

Vertebral artery hypoplasia (VAH), defined as a vertebral artery diameter ≤2.5mm, is linked to significantly lower net blood flow. This finding suggests VAH may impact posterior circulation, increasing stroke risk.

Area of Science:

  • Neurology
  • Vascular Medicine
  • Radiology

Background:

  • Vertebral artery hypoplasia (VAH) definition and clinical significance are debated.
  • VAH is a potential risk factor for posterior circulation ischemic stroke.

Purpose of the Study:

  • Establish an optimal cutoff diameter for defining VAH.
  • Investigate the association between unilateral VAH and reduced net vertebral artery flow volume.

Main Methods:

  • Retrospective analysis of 1000 healthy subjects without cerebrovascular disease.
  • Determined VA diameter cutoff for VAH and measured flow volumes.

Main Results:

  • A vertebral artery diameter ≤2.5mm was identified as the ideal cutoff for VAH.
  • Unilateral VAH was associated with significantly lower net vertebral artery flow volume (140.7±46.2 mL/min) compared to controls (190.1±54.5 mL/min).
  • Flow volume insufficiency (<100 mL/min) was more frequent in individuals with VAH (22.1%) than without (2.4%).

Conclusions:

  • Asymptomatic individuals with VAH exhibit reduced net vertebral artery flow.
  • VAH is associated with a higher incidence of vertebral artery flow insufficiency, suggesting potential clinical relevance.

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