There is a long-held belief in the association between the full moon and extremes of human behaviour and adverse health consequences. Small-scale studies are conflicting, however most suggest no clear association between lunar phase and occurrence of acute coronary syndromes.We conducted a multi-centre retrospective study from the Melbourne Intervention Group registry, including 7,570 ST-elevation myocardial infarction (STEMI) cases from 6 tertiary centres over a 12-year study period in Victoria, Australia and performed statistical analysis using Stata software.Primary outcomes studied were the incidence of STEMI, the occurrence of major adverse cardiac and cerebrovascular events and mortality at 1 and 5 years in cases of ST-elevation myocardial infarction undergoing primary or rescue percutaneous coronary intervention during the full moon between 2005-2017 in Victoria, Australia.This study demonstrated no significant difference in STEMI incidence (p=0.61) nor of major adverse cardiovascular events across all lunar phases. Subgroup analysis confirmed no difference in outcomes during the full moon compared to a composite of other lunar phases. Kaplan-Meier survival estimates showed similar 30-day outcomes across lunar phases (p=0.35) and when comparing full moon to a composite of other lunar phases (p=0.45). Similarly, there was no significant difference in survival at 1 and 5 years between lunar phases (p=0.68) or compared to the full moon phase (p=0.51).This study showed no significant difference in the incidence or cardiovascular outcomes and survival in patients with ST-elevation myocardial infarction undergoing primary or rescue percutaneous coronary intervention during the lunar phases. This article is protected by copyright. All rights reserved.
