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December 2021; 11 (6) Research

Sex Differences in the Risk of 30-Day Death After Acute Ischemic Stroke

Fumi Irie, Ryu Matsuo, View ORCID ProfileKuniyuki Nakamura, Yoshinobu Wakisaka, View ORCID ProfileTetsuro Ago, Masahiro Kamouchi, Takanari Kitazono, on behalf of the Fukuoka Stroke Registry Investigators
First published April 14, 2021, DOI: https://doi.org/10.1212/CPJ.0000000000001087
Fumi Irie
Department of Medicine and Clinical Science (FI, RM, KN, YW, TA, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; Food Safety Commission Secretariat (FI), Cabinet Office, Government of Japan, Tokyo, Japan; Department of Health Care Administration and Management (RM, MK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; and Center for Cohort Studies (MK, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
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Ryu Matsuo
Department of Medicine and Clinical Science (FI, RM, KN, YW, TA, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; Food Safety Commission Secretariat (FI), Cabinet Office, Government of Japan, Tokyo, Japan; Department of Health Care Administration and Management (RM, MK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; and Center for Cohort Studies (MK, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
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Kuniyuki Nakamura
Department of Medicine and Clinical Science (FI, RM, KN, YW, TA, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; Food Safety Commission Secretariat (FI), Cabinet Office, Government of Japan, Tokyo, Japan; Department of Health Care Administration and Management (RM, MK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; and Center for Cohort Studies (MK, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
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  • ORCID record for Kuniyuki Nakamura
Yoshinobu Wakisaka
Department of Medicine and Clinical Science (FI, RM, KN, YW, TA, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; Food Safety Commission Secretariat (FI), Cabinet Office, Government of Japan, Tokyo, Japan; Department of Health Care Administration and Management (RM, MK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; and Center for Cohort Studies (MK, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
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Tetsuro Ago
Department of Medicine and Clinical Science (FI, RM, KN, YW, TA, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; Food Safety Commission Secretariat (FI), Cabinet Office, Government of Japan, Tokyo, Japan; Department of Health Care Administration and Management (RM, MK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; and Center for Cohort Studies (MK, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
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Masahiro Kamouchi
Department of Medicine and Clinical Science (FI, RM, KN, YW, TA, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; Food Safety Commission Secretariat (FI), Cabinet Office, Government of Japan, Tokyo, Japan; Department of Health Care Administration and Management (RM, MK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; and Center for Cohort Studies (MK, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
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Takanari Kitazono
Department of Medicine and Clinical Science (FI, RM, KN, YW, TA, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; Food Safety Commission Secretariat (FI), Cabinet Office, Government of Japan, Tokyo, Japan; Department of Health Care Administration and Management (RM, MK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; and Center for Cohort Studies (MK, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
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Department of Medicine and Clinical Science (FI, RM, KN, YW, TA, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; Food Safety Commission Secretariat (FI), Cabinet Office, Government of Japan, Tokyo, Japan; Department of Health Care Administration and Management (RM, MK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; and Center for Cohort Studies (MK, TK), Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
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Sex Differences in the Risk of 30-Day Death After Acute Ischemic Stroke
Fumi Irie, Ryu Matsuo, Kuniyuki Nakamura, Yoshinobu Wakisaka, Tetsuro Ago, Masahiro Kamouchi, Takanari Kitazono, on behalf of the Fukuoka Stroke Registry Investigators
Neurol Clin Pract Dec 2021, 11 (6) e809-e816; DOI: 10.1212/CPJ.0000000000001087

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Abstract

Objective To examine sex differences in early stroke deaths according to cause of death.

Methods We investigated 30-day deaths in patients with acute ischemic stroke enrolled in a multicenter stroke registry between 2007 and 2019 in Fukuoka, Japan. We estimated the multivariable-adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) of cause-specific deaths for women vs men using Cox proportional hazards models and competing risk models. The risk of acute infections during hospitalization and the associated case fatality rates were also compared between the sexes.

Results Among 17,956 patients with acute ischemic stroke (women: 41.3%), the crude 30-day death rate after stroke was higher in women than men. However, adjusting for age and stroke severity resulted in a lower risk of death among women (HR [95% CI]: 0.76 [0.62–0.92]). Analyses using competing risk models revealed that women were less likely to die of acute infections (subdistribution HR [95% CI]: 0.33 [0.20–0.54]). Further analyses showed that women were associated with a lower risk of acute infections during hospitalization (OR [95% CI]: 0.62 [0.52–0.74]) and a lower risk of death due to these infections (subdistribution HR [95% CI]: 052 [0.33–0.83]).

Conclusions When adjusting for confounders, the female sex was associated with a lower risk of 30-day death after stroke, which could be explained by a female survival advantage in poststroke infections. Sex-specific strategies are needed to reduce early stroke deaths.

Classification of Evidence This is a Class I prognostic study because it is a prospective population-based cohort with objective outcomes. Female sex appears to be protective against early stroke deaths and post stroke infections.

Footnotes

  • Funding information and disclosures are provided at the end of the article. Full disclosure form information provided by the authors is available with the full text of this article at Neurology.org/cp.

  • The Fukuoka Stroke Registry Investigators are listed in Appendix 2 at links.lww.com/CPJ/A286.

  • ↵* These authors contributed equally to this work.

  • Class of Evidence: NPub.org/coe

  • Received December 1, 2020.
  • Accepted March 23, 2021.
  • © 2021 American Academy of Neurology
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