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Acute myocardial infarction without disrupted yellow plaque in young patients below 50 years old

Yasunori Ueda1, Katsuki Okada, Nobuyuki Ogasawara

  • 1Cardiovascular Division, Osaka Police Hospital, Osaka, Japan. ueda@oph.gr.jp

Journal of Interventional Cardiology
|May 26, 2007
PubMed

Insights

Younger acute myocardial infarction (MI) patients (<50 years) show higher rates of smoking, obesity, and hypercholesterolemia. Disrupted yellow plaque with thrombus (DYP&T) is less common in younger individuals, suggesting smoking drives thrombosis in less vulnerable plaques.

Area of Science:

  • Cardiology
  • Vascular Biology
  • Public Health

Background:

  • Acute myocardial infarction (MI) is often linked to disrupted yellow plaque and thrombus (DYP&T).
  • Pathophysiology of MI in younger patients (<50 years) compared to older individuals remains unclear.
  • Understanding these differences is crucial for targeted prevention and treatment strategies.

Purpose of the Study:

  • To investigate the clinical and angioscopic characteristics of young patients experiencing acute MI.
  • To compare the prevalence of disrupted yellow plaque with thrombus (DYP&T) in young versus older acute MI patients.
  • To identify risk factors associated with acute MI in younger populations.

Main Methods:

  • Comparative analysis of clinical data from 893 acute MI patients undergoing catheterization, stratifying by age (<50 vs. >=50 years).
  • Angioscopic evaluation of culprit lesions in 20 young acute MI patients to identify DYP&T.
  • Statistical comparison of demographic, clinical, and angioscopic findings between age groups.

Main Results:

  • Younger patients (<50 years) exhibited significantly higher rates of smoking (68% vs. 48%), obesity (42% vs. 15%), and hypercholesterolemia (56% vs. 35%) compared to older patients.
  • DYP&T was observed in 70% of young patients' culprit lesions.
  • Prevalence of DYP&T was lower in the very young (<40 years) compared to those aged 40-50 years (44% vs. 91%), with a trend towards higher smoking rates in the <40 group.

Conclusions:

  • Younger acute MI patients (<50 years), particularly those <40 years, present with less frequent DYP&T but higher prevalence of modifiable risk factors like smoking, obesity, and hypercholesterolemia.
  • Smoking appears to be a significant factor in causing thrombotic occlusion in coronary lesions with lower inherent thrombogenic potential in young individuals.
  • These findings highlight the need for early intervention and risk factor modification in young adults to prevent acute MI.
Abstract

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