Body mass index and mortality in acute myocardial infarction patients
American Journal of Medicine, 08/09/2012
Bucholz EM et al. – There appears to be an obesity paradox among patients after acute myocardial infarction such that higher body mass index (BMI) is associated with lower mortality, an effect that was not modified by patient characteristics and was comparable across age, sex, and diabetes subgroups.Methods
- Data from 2 registries of patients hospitalized in the US with acute myocardial infarction between 2003–2004 (PREMIER) and 2005–2008 (TRIUMPH) were used to examine the association of BMI with mortality.
- Patients (n=6359) were categorized into BMI groups (kg/m2) using baseline measurements.
- Two sets of analyses were performed using Cox proportional hazards regression with fractional polynomials to model BMI as categorical and continuous variables.
- To assess the independent association of BMI with mortality, analyses were repeated, adjusting for 7 domains of patient and clinical characteristics.
- Median BMI was 28.6.
- BMI was inversely associated with crude 1–year mortality (normal, 9.2%; overweight, 6.1%; obese, 4.7%; morbidly obese; 4.6%; P <.001), which persisted after multivariable adjustment.
- When BMI was examined as a continuous variable, the hazards curve declined with increasing BMI and then increased above a BMI of 40.
- Compared with patients with a BMI of 18.5, patients with higher BMIs had a 20% to 68% lower mortality at 1 year.
- No interactions between age (P=.37), sex (P=.87), or diabetes mellitus (P=.55) were observed.