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Increased lipoprotein(a) is associated with reduced myocardial vasoreactivity in young healthy men

Jan Sundell1, Hanna Laine, Olli T Raitakari

  • 1Turku PET Centre, Turku University Central Hospital, P.O. Box 52, FIN-20521 Turku, Finland. jan.sundell@utu.fi

Atherosclerosis
|February 22, 2005
PubMed

Insights

Elevated lipoprotein(a) levels in young men are linked to impaired myocardial vasoreactivity. This suggests potential cardiovascular risks even in healthy individuals with high lipoprotein(a).

Area of Science:

  • Cardiology
  • Vascular Biology
  • Lipid Metabolism

Background:

  • Lipoprotein(a) is an independent risk factor for atherosclerotic cardiovascular disease.
  • Myocardial vasoreactivity is crucial for adequate blood supply to the heart muscle.
  • The impact of elevated lipoprotein(a) on myocardial vasoreactivity in young, healthy individuals is not well-established.

Purpose of the Study:

  • To investigate the association between lipoprotein(a) levels and myocardial vasoreactivity in healthy men.
  • To determine if increased lipoprotein(a) concentrations affect the heart's ability to dilate blood vessels.

Main Methods:

  • Thirty healthy non-smoking men were divided into groups based on lipoprotein(a) concentrations (>200 mg/L vs. <200 mg/L).
  • Myocardial blood flow was measured using positron emission tomography (PET) with [(15)O]H(2)O.
  • Measurements were taken at baseline and during adenosine infusion, with and without hyperinsulinemia.

Main Results:

  • Basal myocardial blood flow did not differ between groups.
  • Adenosine-stimulated flow tended to be lower in men with increased lipoprotein(a) (p=0.1).
  • During hyperinsulinemia, adenosine-stimulated flow was significantly blunted in men with increased lipoprotein(a) (p=0.03), even after adjusting for cardiovascular risk factors.

Conclusions:

  • Young healthy men with elevated lipoprotein(a) (>200 mg/L) exhibit impaired myocardial vasoreactivity.
  • This impairment suggests a potential early cardiovascular risk associated with high lipoprotein(a) levels.
  • These findings highlight the importance of assessing lipoprotein(a) in cardiovascular risk stratification.
Abstract

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