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Vienna, Austria – 17 October 2015: Infections in childhood are associated with an increased risk of early heart attacks, according to research presented today at Acute Cardiovascular Care 2015 by Dr Andriany Qanitha, a PhD candidate at the Academic Medical Centre in Amsterdam, the Netherlands.1 Unhealthy lifestyles in adulthood appear to compound the risk of early heart attack.
Embargo: 17 October 2015 at 08:30 CEST
“Cardiovascular disease (CVD) is the number one killer worldwide, including in Indonesia where it accounts for 31.9% of all deaths,” said Dr Qanitha. “CVD risk factors are rising rapidly in South-East Asia, particularly in young people. Most Indonesian CVD patients are under 56 years old and still economically productive. This very young CVD onset raises the question of whether local circumstances may play a role.”She continued: “Infectious diseases such as typhoid fever, measles, chicken pox, bronchitis, tuberculosis and dengue fever are common in Indonesian children. We hypothesised that infections experienced in childhood and adolescence might adversely affect the vasculature and initiate atherosclerosis, leading to premature acute coronary syndromes (ACS) or heart attacks.”This was a population-based case-control study of 153 patients with a first ACS before the age of 56 years and 153 age- and sex-matched controls with no history of ACS in Makassar, Indonesia. Severe infection was defined as fever for three days or more, or hospitalisation due to infectious disease. In Indonesia there is no reliable registry data on infection related hospitalisation and prescription of antibiotics. The researchers used a detailed questionnaire and interviews with patients and controls, plus family members (parents, aunts, uncles, siblings), to obtain information on history of infection during four periods of early life: infancy and pre-school (0–5 years), elementary school (6–13 years), junior high school (14–17 years), and senior high school (18–21 years). Interviewees were asked to verify the information with other family members if they were in doubt. The researchers used the information to calculate an infection score ranging from 0 to 4. Positive early-life infection was defined as a score of 2 or more.Information about traditional CVD risk factors was obtained using an interviewed-questionnaire and diagnostic test results in cases and contemporary tests in controls. Data was recorded on age, sex, occupation, monthly income, educational level, dietary pattern, physical activity, smoking status, family history of heart disease, diabetes, sudden cardiac death, and known history of hypertension and diabetes. Study participants were 47 years old on average (range 28–55 years) and 81.7% were male. In crude analysis, infection experienced in childhood and adolescence was associated with a three-fold higher occurrence of premature ACS later in life.The investigators used four models which taken together adjusted for smoking status, physical activity, diet pattern, socioeconomic status, parental CVD history, and traditional risk factors. Due to sample size, the analyses were restricted to less than 15 variables in one model. Adjusted odds ratios for the association between childhood infection and risk of premature ACS ranged from 2.5 to 4.2 and all were significant.The researchers investigated whether early life infection modifies the effect of traditional risk factors on developing early CVD. The Framingham risk score (FRS) was used to rank all participants as low, intermediate or high risk based on age, gender, total and HDL cholesterol, smoking status, diabetes, blood pressure and use of blood pressure medications. There was an indication for interaction between childhood infection and CVD risk factors (p=0.052). “This suggests that infection in childhood may potentiate the impact of traditional risk factors on premature ACS,” said Dr Qanitha.The risk of premature ACS in patients with childhood infections increased with more CVD risk factors, with odds ratios of 1.5, 4.4 and 10.0 for low, intermediate, and high Framingham risk scores, respectively (all significant). “One explanation is that infection initiates chronic inflammation and atherosclerosis in the arteries,” said Dr Qanitha. “It could be that infection modifies CVD risk factors and leads to ACS.”She concluded: “Our findings may apply to other countries in South-East Asia where infectious disease is still prevalent. Here governments and policymakers should have a combined strategy for tackling infectious disease and cardiovascular disease. Early-life infection may be a relatively unknown contributing factor in ACS occurrence.”ENDS
1Dr Andriany Qanitha will present the abstract ‘Early-life infection and premature acute coronary syndrome: a case-control study’ during: Poster Session 1: Databases, Registries and Surveys on 17 October at 08:30 to 12:30 CEST
SOURCES OF FUNDING: The study was sponsored by the Directorate General of Higher Education (DGHE) Ministry of National Education Republic of Indonesia, based on letter No. 600/E4.4/K/2011, dated July 12, 2011.
This press release is based on an abstract presented at Acute Cardiovascular Care 2015 and this does not necessarily reflect the opinion of the European Society of Cardiology
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Acute Cardiovascular Care 2015 will be held 17 to 19 October in Vienna, Austria at the HOFBURG Vienna congress centre. The full scientific programme is available here.
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