Journal Article

Familial clustering of myocardial infarction in first-degree relatives: a nationwide study

Mia Nielsen, Charlotte Andersson, Thomas A. Gerds, Per Kragh Andersen, Thomas Bo Jensen, Lars Køber, Gunnar Gislason and Christian Torp-Pedersen

in European Heart Journal

Published on behalf of European Society of Cardiology

Volume 34, issue 16, pages 1198-1203
Published in print April 2013 | ISSN: 0195-668x
Published online January 2013 | e-ISSN: 1522-9645 | DOI: https://dx.doi.org/10.1093/eurheartj/ehs475
Familial clustering of myocardial infarction in first-degree relatives: a nationwide study

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Aims

Family history is an established risk factor for myocardial infarction (MI), but it is not clear how this risk changes with number and gender of first-degree relatives with MI. We used the entire Danish population to examine the importance of MI in siblings and parents.

Methods and results

This study is a retrospective nationwide register-based cohort study including registered relatives to all Danish citizens diagnosed with MI in the period 1978–2010. In the entire Danish population we identified siblings to 7552 patients with a first-time MI. The rate ratios (RR) calculated by Poisson models showed an RR of 4.30 (95% confidence interval 3.53–5.23) for siblings of a patient with MI. Children of parents with MI also showed high risk: for children of a maternal case RR 2.40 (2.20–2.60), and of a paternal case RR 1.98 (1.98–2.09), respectively; P value for gender interaction <0.0001. A paternal case with MI at an age <50 years was associated with an RR of 3.30 (2.92–3.72) while a case >50 years was associated with a risk of 1.83 (1.73–1.93). For maternal cases below and above 50 years of age the risks were 3.23 (2.56–4.10) and 2.31 (2.11–2.52), respectively.

Conclusion

First-degree relatives of a patient with myocardial infarction themselves have a substantial higher risk of myocardial infarction. The risk is particularly elevated when the MI case is the mother or a sibling, and when the MI case has the infarction before the age of 50 years.

Keywords: Familial clustering; Myocardial infarction; First-degree relatives

Journal Article.  2960 words.  Illustrated.

Subjects: Cardiovascular Medicine

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