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Apolipoproteins as predictors of ischaemic stroke in patients with a previous transient ischaemic attack

M Bhatia1, S C Howard, T G Clark

  • 1Stroke Prevention Research Unit, Radcliffe Infirmary, Centre for Statistics in Medicine, University of Oxford, UK.

Cerebrovascular Diseases (Basel, Switzerland)
|February 24, 2006
PubMed

Insights

Apolipoprotein B and its ratio to apolipoprotein A1 are strong predictors of ischaemic stroke risk in patients with a history of transient ischaemic attack (TIA). These findings suggest improved stroke risk assessment using lipid sub-fractions.

Area of Science:

  • Cardiovascular Medicine
  • Neurology
  • Lipidology

Background:

  • Traditional lipid markers (total cholesterol, LDL) show weak associations with ischaemic stroke compared to coronary heart disease.
  • Statins effectively prevent both stroke and CHD, suggesting other lipid sub-fractions influence stroke risk.
  • Apolipoprotein B is a stronger predictor of CHD than LDL cholesterol, but its role in stroke risk, especially post-TIA, is understudied.

Purpose of the Study:

  • To investigate the association between baseline lipid sub-fractions, including apolipoproteins, and ischaemic stroke risk in patients with a history of transient ischaemic attack (TIA).
  • To identify superior lipid biomarkers for predicting ischaemic stroke in this patient cohort.

Main Methods:

  • Prospective cohort study of 261 patients with previous TIA.
  • Assessment of baseline total cholesterol, LDL, HDL, apolipoprotein A1 (apo A1), and apolipoprotein B (apo B).
  • Cox proportional hazards models used to analyze associations with ischaemic stroke risk over 10-year follow-up.

Main Results:

  • The apolipoprotein B/apolipoprotein A1 ratio was the strongest independent predictor of ischaemic stroke (HR=2.94).
  • Apolipoprotein B alone was also a significant independent predictor (HR=2.26).
  • Total cholesterol, LDL, HDL, LDL/HDL ratio, and apo A1 did not show statistically significant associations with ischaemic stroke risk.

Conclusions:

  • Apolipoprotein B and the apo B/apo A1 ratio are significant predictors of ischaemic stroke in patients with prior TIA.
  • These apolipoprotein markers may offer improved prognostic value for ischaemic stroke risk assessment.
  • Further research is needed to confirm these findings in patients on statin therapy.
Abstract

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