• Emily J MacKay, Shyam Bharat, Rashid A Mukaddim, Ramon Erkamp, Jonathan Sutton, Ather K Muhammad, Joseph S Savino, and Jiri Horak.
• Department of Anesthesiology and Critical Care, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA; Penn Center for Perioperative Outcomes Research and Transformation, University of Pennsylvania, Philadelphia, PA; Penn's Cardiovascular Outcomes, Quality and Evaluative Research Center, University of Pennsylvania, Philadelphia, PA; Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, PA. Electronic address: emily.mackay@pennmedicine.upenn.edu.
• J. Cardiothorac. Vasc. Anesth. 2024 Apr 1; 38 (4): 895904895-904.

ObjectiveTo test the correlation of ejection fraction (EF) estimated by a deep-learning-based, automated algorithm (Auto EF) versus an EF estimated by Simpson's method.DesignA prospective observational study.SettingA single-center study at the Hospital of the University of Pennsylvania.ParticipantsStudy participants were ≥18 years of age and scheduled to undergo valve, aortic, coronary artery bypass graft, heart, or lung transplant surgery.InterventionsThis noninterventional study involved acquiring apical 4-chamber transthoracic echocardiographic clips using the Philips hand-held ultrasound device, Lumify.Measurements And Main ResultsIn the primary analysis of 54 clips, compared to Simpson's method for EF estimation, bias was similar for Auto EF (-10.17%) and the experienced reader-estimated EF (-9.82%), but the correlation was lower for Auto EF (r = 0.56) than the experienced reader-estimated EF (r = 0.80). In the secondary analyses, the correlation between EF estimated by Simpson's method and Auto EF increased when applied to 27 acquisitions classified as adequate (r = 0.86), but decreased when applied to 27 acquisitions classified as inadequate (r = 0.46).ConclusionsApplied to acquisitions of adequate image quality, Auto EF produced a numerical EF estimate equivalent to Simpson's method. However, when applied to acquisitions of inadequate image quality, discrepancies arose between EF estimated by Auto EF and Simpson's method. Visual EF estimates by experienced readers correlated highly with Simpson's method in both variable and inadequate imaging conditions, emphasizing its enduring clinical utility.Copyright © 2024 Elsevier Inc. All rights reserved.

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