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Heart and Vessels

, Volume 32, Issue 10, pp 1271–1276 | Cite as

Seasonal variation in patient characteristics and in-hospital outcomes of Takotsubo syndrome: a nationwide retrospective cohort study in Japan

  • Toshiaki Isogai
  • Hiroki Matsui
  • Hiroyuki Tanaka
  • Kiyohide Fushimi
  • Hideo Yasunaga
Short Communication

Abstract

Although there is reportedly seasonal variation in the occurrence of Takotsubo syndrome (TTS), it is unknown whether there is a relationship between season and patient characteristics, or whether season influences outcomes. Using the Diagnosis Procedure Combination database in Japan, we retrospectively identified 4306 patients (mean age 73.6 years) hospitalized with TTS between January 2011 and December 2013. We divided patients into four groups according to season of admission [n = 914, Spring (March–May); n = 1243, Summer (June–August); n = 1245, Autumn (September–November); n = 904, Winter (December–February)]. The outcomes were in-hospital mortality and cardiovascular complications. We compared patient backgrounds and outcomes across seasons and estimated the adjusted odds ratios (aORs) and 95% confidence intervals (CIs) for outcomes in logistic regression analyses adjusted for multiple propensity scores. Although there was no significant difference in age across seasons, the proportion of males differed significantly (from 18.5% in autumn to 23.9% in winter; p = 0.016). The incidence of psychiatric disease (from 4.9% in spring to 7.9% in summer; p = 0.025) and sepsis (from 0.8% in winter to 2.6% in summer; p = 0.019) also differed significantly with season. In-hospital mortality was not significantly influenced by season (p = 0.377): spring, 5.1%; summer, 6.0%; autumn, 4.6%; winter, 6.0%. However, in-hospital mortality ranged widely across months from 3.0% in September to 7.5% in April. The incidence of ventricular tachycardia/fibrillation was significantly different (p = 0.038): spring, 2.2% (reference); summer, 3.3% (aOR 1.46, 95% CI 0.84–2.51); autumn, 2.7% (aOR 1.27, 95% CI 0.72–2.22); winter, 4.4% (aOR 1.92, 95% CI 1.11–3.33). Although season did not appear to influence the in-hospital mortality of TTS, monthly variation may exist in the risk of death in patients with TTS. There were significant seasonal variations in the proportions of males, patients with psychiatric disease or sepsis, and the incidence of ventricular arrhythmias among patients with TTS.

Keywords

Takotsubo syndrome Season Background Mortality Complication 

Notes

Compliance with ethical standards

Funding source

This study was supported by grants from the Ministry of Health, Labour and Welfare, Japan (Grant numbers: H29-Policy-Designated-009 and H27-Policy-Strategy-011); the Ministry of Education, Culture, Sports, Science and Technology, Japan (Grant number: 17H04141); and the Japan Agency for Medical Research and Development. The funders had no role in the execution of this study or interpretation of the results.

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This study was approved by the Institutional Review Board at The University of Tokyo.

Informed consent

The need for informed consent for each patient was waived because all data were anonymized.

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Copyright information

© Springer Japan KK 2017

Authors and Affiliations

  1. 1.Department of Clinical Epidemiology and Health Economics, School of Public HealthThe University of TokyoTokyoJapan
  2. 2.Department of CardiologyTokyo Metropolitan Tama Medical CenterTokyoJapan
  3. 3.Department of Health Policy and Informatics, Graduate School of MedicineTokyo Medical and Dental UniversityTokyoJapan

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