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Increased risk of myocardial infarction in HIV-infected patients in France, relative to the general population

Lang, Sylviea,b; Mary-Krause, Muriellea,b; Cotte, Laurentc; Gilquin, Jacquesd; Partisani, Marialuisae; Simon, Annef; Boccara, Franckg; Bingham, Annieh,i; Costagliola, Dominiquea,b,jfor the French Hospital Database on HIV-ANRS CO4

doi: 10.1097/QAD.0b013e328339192f
Research Letters
Free

The incidence of myocardial infarction (MI) is lower in France than in English-speaking and northern European countries. We estimated the incidence of MI in the HIV-infected population in France, on the basis of the data from the FHDH-ANRS CO4 cohort, by comparison with the general population. The sex- and age-standardized morbidity ratio was estimated as 1.5 [95% confidence interval (CI) 1.3–1.7] overall, 1.4 (95% CI 1.3–1.6) in men and 2.7 (95% CI 1.8–3.9) in women.

aINSERM U943

bUPMC Univ-Paris 6, UMR S943, Paris, France

cHospice Civil de Lyon, Hôtel Dieu, service d'hépatologie, Lyon, France

dAPHP, Hôpital Necker, Service des Maladies Infectieuses et Tropicales, Paris, France

eHôpitaux Universitaires de Strasbourg, Hôpital de jour du COREVIH, Strasbourg, France

fAPHP, Hôpital Pitié-Salpêtrière, Service de Médecine Interne I, France

gAPHP, Hôpital Saint-Antoine, Service de Cardiologie, France

hINSERM U970, Paris Cardiovascular Research Center_PARCC, France

iUniversité Paris Descartes, UMR S970, France

jAPHP, Hôpital Pitié-Salpêtrière, Service des Maladies Infectieuses et Tropicales, Paris, France.

Received 11 February, 2010

Accepted 24 February, 2010

Correspondence to Sylvie Lang, INSERM U943, 56 boulevard Vincent Auriol, BP 335, 75625 Paris Cedex 13, France. Tel: +33 1 42 16 42 69; fax: +33 1 42 16 42 61; e-mail: slang@ccde.chups.jussieu.fr

Several studies have shown an increased risk of myocardial infarction (MI) in HIV-infected patients exposed to protease inhibitors, whereas the association with certain nucleoside reverse transcriptase inhibitors is more controversial [1,2]. The SMART study showed that antiretroviral treatment interruption significantly increased the risk of MI relative to continuous treatment [3]. The incidence of MI is lower in France than in English-speaking and northern European countries [4]. We estimated the incidence of MI in the HIV-infected population in France, on the basis of the data collected for the French Hospital Database on HIV (FHDH-ANRS CO4), by comparison with three population-based registries [5].

The FHDH-ANRS CO4 cohort and the methodology of this study are described in detail elsewhere [2]. Between 2000 and 2006, 74 958 HIV-infected patients who had been examined at least once were included in the database, corresponding to a total follow-up of 298 156 person-years (207 300 person-years for men and 90 856 person-years for women). As part of a nested case–control study, we reviewed all reported cases of MI (code I21 of the International Disease Classification) [6]. The diagnosis of MI was validated by a cardiologist, based on cardiac signs and symptoms, troponin and/or creatine kinase levels, and electrocardiographic findings collected in the medical records, using the American College of Cardiology/European Society of Cardiology definition [7].

The sex and age MI incidence rates were compared with the estimated rates in the general population aged from 35 to 64 years during the same period [5]. In the three French regions covered by registries, MI was defined as lethal and nonlethal MI and coronary death according to MONICA protocol [8]. Sex- and age-specific (per 5-year stratum) incidence rates in the HIV-infected and general populations were compared using standardized morbidity ratios (SMRs) [9].

There were 360 validated cases of MI (325 men, 35 women) among the HIV-infected patients, corresponding to an incidence rate of 1.24 per 1000 patient-years [95% confidence interval (CI) 1.11–1.36]. Of these 360 cases, 313 were diagnosed between 35 and 64 years of age (283 men, 30 women), corresponding to a total follow-up of 221 183 patient-years and an incidence of 1.42 per 1000 patient-years (95% CI 1.3–1.5). The incidence rates per age stratum are shown in Fig. 1(a) (men) and Fig. 1(b) (women). The risk of MI was higher in both HIV-infected men and women than in the general population, with respective SMRs of 1.4 (95% CI 1.3–1.6) and 2.7 (95% CI 1.8–3.9). The bulk of this increase concerned men up to 55 years of age and women up to 45. The overall SMR was 1.5 (95% CI 1.3–1.7).

Fig. 1

Fig. 1

The MI incidence rates in HIV-infected patients and in the general population have already been compared in English-speaking countries [10] and in northern Europe [11]. Our results, obtained in a country with a low overall incidence of MI, are very similar to those of Triant et al. for the USA, who also found a higher relative risk in women (3.0) than in men (1.4) [10]. Savès et al.[12], who used the PRIME model to predict the risk of coronary disease in HIV-infected patients in France, based on smoking, systolic blood pressure and total and high-density lipoprotein cholesterol levels, also found a higher relative risk in women than in men, but the relative risks were smaller than in our study (1.2 versus 1.4 for men, 1.6 versus 2.7 for women). This suggests that the increase may be due not only to classical risk factors, accounted for in the PRIME model, but also to exposure to combined antiretroviral treatment, as shown by Obel et al.[11], and to HIV infection itself. For example, Lo et al.[13] recently reported that the risk of subclinical coronary arteriosclerosis correlated with the CD4/CD8 ratio and MCP1 level. The higher relative risks of MI found in younger men and women in our study raises the possibility of a premature aging effect of HIV infection on the cardiovascular system [14].

Thus, in France, a country with a low incidence of MI in the general population, the risk of MI is increased in HIV-infected patients, and this increase is unlikely to be explained only by classical cardiovascular risk factors.

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Acknowledgements

The study was sponsored by Agence Nationale de Recherche sur le SIDA et les Hépatites Virales (French National Agency for Research on AIDS and Viral Hepatitis). The full list of investigators participating in the MONICA project can be found at http://www.ktl.fi/monica/. Accessed 12 January 2010. The full list of investigators participating in the Clinical Epidemiology Group of the French Hospital Database on HIV can be found at http://www.ccde.fr. Accessed 12 January 2010. We thank all the cohort participants, and especially the research assistants, without whom this work would not have been possible. Special thanks to P. Ducimetière (Villejuif), P. Amouyel (Lille), D. Arveiler (Strasbourg) and J. Ferrières (Toulouse) for providing the MONICA-France incidence data.

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