Diagonal earlobe crease and long-term survival after myocardial infarction

BACKGROUND: The association between the presence of a diagonal earlobe crease (DEC) and coronary artery disease has been prescribed earlier. However, it is unclear whether patients with acute myocardial infarction (AMI) and DEC have a higher risk of dying. METHODS: Study participants were persons with AMI who were included in the KORA Myocardial Infarction Registry Augsburg from August 2015 to December 2016. After taking pictures of both earlobes, two employees independently assessed the severity of DEC in 4°. For analysis, the expression of the DEC was dichotomized. Information on risk factors, severity and therapy of the AMI was collected by interview and from the medical record. Vital status post AMI was obtained by population registries in 2019. The relationship between DEC and survival time was determined using Cox proportional hazards models. RESULTS: Out of 655 participants, 442 (67.5%) showed DEC grade 2/3 and 213 (32.5%) DEC grade 0/1. Median observation period was 3.06 years (5–1577 days). During this period, 26 patients (12.2%) with DEC grade 0/1 and 92 patients (20.8%) with grade 2/3 died (hazard ratio 1.91, 95% confidence interval (CI) 1.23–2.96, p = 0.0037). In the fully adjusted model, patients with DEC grade 2/3 had a 1.48-fold increased risk of death compared to the DEC grade 0/1 patient group (CI 0.94–2.34, p = 0.0897). The fully adjusted model applied for 1-year survival revealed a significant, 2.57-fold hazard ratio of death (CI 1.07–6.17, p = 0.0347) for the patients with DEC grade 2/3. CONCLUSIONS: Our results indicate that DEC is independently associated with 1-year AMI survival. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12872-021-02425-4.