Takotsubo syndrome before and during the COVID‐19 pandemic in Austria: a retrospective cohort study (TOSCA‐19)

AIMS: This study aims to investigate the prevalence of Takotsubo syndrome (TTS) as a percentage of the total number of acute coronary syndrome (ACS), including non‐STE‐elevation myocardial infarction and ST‐elevation myocardial infarction, as well as the short‐term outcome of TTS patients before and during the COVID‐19 pandemic. METHODS AND RESULTS: We compared patients from two different periods: (i) Period 1 (before the COVID‐19 pandemic): 1 March to 30 December 2019, and (ii) Period 2 (during the COVID‐19 pandemic): 1 March to 30 December 2020. The retrospective database was created from the archives of the participating hospitals or electronic hospital systems by trained medical personnel. The subjects' medical history, cardiovascular risk factors, laboratory values, echocardiography findings, and an in‐hospital outcome were variables of interest. Furthermore, propensity score matching analysis was performed to evaluate the short‐term prognosis in TTS and ACS patients. Altogether six Austrian centres—(i) 3rd Medical Department of Cardiology and Intensive Care Medicine, Clinic Ottakring, Vienna, Austria; (ii) 5th Medical Department of Cardiology, Clinic Favoriten, Vienna, Austria; (iii) 2nd Medical Department, Hanusch Hospital, Vienna, Austria; (iv) University Clinic of Internal Medicine III, Cardiology and Angiology, Medical University of Innsbruck, Austria; (v) Department of Cardiology, University Hospital Graz, Graz, Austria; (vi) Department of Cardiology and Intensive Medicine, Kepler University Clinic, Linz, Austria—participated in the study. During period 1, 87 (3.5%) patients out of 2482 ACS patients had TTS in all participating centres. During period 2, 71 (2.7%) patients out of 2572 ACS patients had TTS in all participating centres. Accordingly, the prevalence of TTS remained stable irrespective of potential psychologic stress during the COVID pandemic. Furthermore, the baseline characteristics of TTS patients did not change during the COVID‐19 pandemic. The prevalence of in‐hospital complications [cardiogenic shock (4.6% vs. 4.3%, P = 0.925), ventricle thrombus (1.1% vs. 1.4%, P = 0.885) and in‐hospital bleeding (3.4% vs. 1.4%, P = 0.417)] remained stable. The all‐cause in‐hospital mortality of TTS patients did not change during the COVID‐19 pandemic [χ (2)(2) = 0.058, P = 0.810]. Moreover, a propensity score matching analysis of all‐cause in‐hospital mortality between matched TTS and ACS patients showed higher in‐hospital mortality in ACS patients during COVID‐19 pandemic (P = 0.043). CONCLUSIONS: Despite the well‐known increased psychologic stress during the COVID‐19 pandemic, the prevalence of TTS during the COVID‐19 pandemic and the short‐term clinical outcome in Austria remained unimpacted.