Résumé
Background: In patients with acute myocardial infarction (AMI), recent studies have intriguingly reported that up to a quarter of AMI patients have none of the 4 main standard modifiable cardiovascular (CV) risk factors (SMuRFs) (i.e. hypertension (HTN), diabetes mellitus (DM), hypercholesterolemia (HC), and smoking) and have worse mortality.
Hypothesis: We tested the hypothesis that the prevalence and prognosis of SMuRF-less patients varies with the definition of risk factors.
Aim: Using a French nationwide MI cohort, we aimed to compare SMuRF-less ST-segment elevation MI (STEMI) patients according to 2 HC definitions, given the possibility of using several HC criteria.
Methods: The French Cohort of Myocardial Infarction Evaluation (FRENCHIE) is a large ongoing AMI cohort, collecting data from all patients hospitalized for AMI < 48 h of symptom onset in 21 French centers. STEMI patients without prior CAD admitted in 2019 to 2022 were studied. DM was defined as prior DM diagnosis, HbA1c>7% or anti-diabetic medications, ongoing or at discharge, HTN was defined as treated or previous HTN diagnosis and smoking was defined as current smoking within the past month. Restrictive HC (RHC) was defined as either a previous diagnosis of HC or statin therapy. Permissive HC (PHC) was defined as previous diagnosis of HC or lipid-lowering therapy, or LDL-C > 135 mg/dL or total Cholesterol > 213 mg/dL.
Results: Among 8008 patients (mean age 61.5± 12.9y, 22.6% women), 41.4% were smokers, 17.4% had diabetes, and 38.5% HTN. According to HC definitions, the prevalence of HC almost doubled, ranging from 30.3% for RHC to 61.0% for PHC. Consequently, the prevalence of SMuRF-less was divided by ≈ two (21.1% vs 11.3%, respectively), depending on the definition of HC used. Age and sex-adjusted logistic regression analysis showed that PHC, but not RHC, was associated with lower odds of in-hospital death (figure). Moreover, having multiple SMuRFs was associated with higher risk of mortality than no SMuRF when using RHC, but not with PHC definition.
Conclusion: The prevalence and impact on acute mortality of being SMURFless varies largely with the definition of HC. More research is needed, using HC standardized definitions to explore these patients.
Frenchie: was supported in part by the RHU iVASC grant ANR-16-RHUS-00010 from the French National Research Agency (ANR) as part of the Investissements d'Avenir program. The FRENCHIE cohort is registered with ClinicalTrials.gov, NCT04050956.