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. 2021 Sep 30;11(9):e044605. doi: 10.1136/bmjopen-2020-044605

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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The Kaplan-Meier survival curve analysis of patients with heart failure and preserved ejection fraction. LAVI >38 mL/m², ratio of Ed/Ea >0.121, NT-proBNP level >783 pg/mL and left ventricular DD grade (0–1 vs 2–3) were significant factors for all-cause mortality or admission for heart failure. Criteria for left ventricular DD grade were adopted from the previous reports.^{10 11}The Ed/Ea ratio was calculated as (E/e′)/(0.9×systolic blood pressure).^{3 8} DD, diastolic dysfunction; Ea, arterial elastance; Ed, diastolic elastance; LAVI, left atrial volume index; NT-proBNP, N-terminal pro-brain natriuretic peptide.