Background: People with type 2 diabetes (T2D) and chronic kidney disease (CKD) are at high risk for heart failure (HF) and premature death from cardiovascular (CV) causes. The FLOW (Research Study To See How Semaglutide Works Compared to Placebo in People With Type 2 Diabetes and Chronic Kidney Disease), which enrolled participants with T2D and CKD, demonstrated that semaglutide, a glucagon-like peptide-1 receptor agonist, reduced the incidence of the primary composite outcome (persistent ≥50% decline in estimated glomerular filtration rate, persistent estimated glomerular filtration rate <15 mL/min/1.73 m 2 , kidney replacement therapy, and kidney or CV death) by 24%., Objectives: This prespecified analysis examined the effects of semaglutide on HF outcomes in this high-risk population., Methods: Participants were randomized (1:1) to once-weekly subcutaneous semaglutide 1 mg or placebo. The prespecified main outcome was a composite of HF events (new onset or worsening of HF leading to an unscheduled hospital admission or an urgent visit, with initiation of or intensified diuretic/vasoactive therapy) or CV death. HF data were collected by the investigator. CV death was adjudicated by an independent committee., Results: A total of 3,533 randomized participants were followed for a median of 3.4 years. HF was present at baseline in 342 participants (19.4%) in the semaglutide group and 336 (19.0%) in the placebo group. In the overall trial population, semaglutide increased time to first HF events or CV death (HR: 0.73; 95% CI: 0.62-0.87; P = 0.0005), HF events alone (HR: 0.73; 95% CI: 0.58-0.92; P = 0.0068), and CV death alone (HR: 0.71; 95% CI: 0.56-0.89; P = 0.0036). The risk reduction for the composite HF outcome was similar in those with (HR: 0.73; 95% CI: 0.54-0.98; P = 0.0338) and without (HR: 0.72; 95% CI: 0.58-0.89; P = 0.0028) HF at baseline. The risk of HF outcomes (HF events or CV death) was generally higher in participants categorized as NYHA functional class III and those with the HF reduced ejection fraction subtype, regardless of treatment., Conclusions: Semaglutide substantially reduced the risk of time to first composite outcome of HF events or CV death, as well as HF events and CV death alone, in a high-risk population with T2D and CKD. These effects were consistent regardless of history of HF. (A Research Study To See How Semaglutide Works Compared to Placebo in People With Type 2 Diabetes and Chronic Kidney Disease [FLOW]; NCT03819153)., Competing Interests: Funding Support and Author Disclosures The FLOW trial was funded by Novo Nordisk A/S. Dr Pratley has received speaker fees paid to his employer, AdventHealth (through December 31, 2023) from Eli Lilly, Lilly USA LLC, and Novo Nordisk; has received consulting fees directed to his institution from AbbVie, AstraZeneca, Bayer AG, Bayer HealthCare Pharmaceuticals, Corcept Therapeutics, Dexcom, Endogenex, Gasherbrum Bio, Genprex, Getz Pharma, Hanmi Pharmaceutical, Hengrui (USA) Ltd, Intas Pharmaceuticals, Eli Lilly, Lilly USA LLC, Merck, Novo Nordisk, Pfizer, Rivus Pharmaceuticals, Scholar Rock, and Sun Pharmaceutical Industries; has received grants directed to his institution from Biomea Fusion, Carmot Therapeutics, Dompe, Endogenex, Fractyl, Eli Lilly, Novo Nordisk, and Sanofi; and has received personal fees (from January 1, 2024) from AdventHealth, a nonprofit entity. Dr Tuttle has received support from National Institutes of Health research grants R01MD014712, U2CDK114886, UL1TR002319, U54DK083912, U01DK100846, OT2HL161847, UM1AI109568, and OT2OD032581, and from Centers for Disease Control and Prevention project numbers 75D301-21-P-12254 and 75D301-23-C-18264; has received investigator-initiated grant support from Travere, Bayer, and the Doris Duke Foundation outside of the submitted work; has received consulting fees from Boehringer Ingelheim, Eli Lilly, and Novo Nordisk; and has received speaker fees from Novo Nordisk. Dr Rossing has received grants from Bayer, AstraZeneca, and Novo Nordisk; has received honoraria paid to the Steno Diabetes Centre Copenhagen from AstraZeneca, Astellas, Boehringer Ingelheim, Gilead, Novo Nordisk, Merck, Mundipharma, Sanofi, and Bayer; and has received consulting fees from AstraZeneca, Astellas, Boehringer Ingelheim, Gilead, Novo Nordisk, Merck, Mundipharma, Sanofi, and Bayer. Dr Perkovic has received honoraria for steering committee, data monitoring committee, or advisory board roles or for scientific presentations from AstraZeneca, Bayer, Boehringer Ingelheim, Chinook, GSK, Janssen, Novo Nordisk, Novartis, Otsuka, Travere, Tricida, and UptoDate; and is Board Director for George Clinical, St Vincent’s Health Australia and several independent medical research institutes. Dr Mann has received grants from Novo Nordisk, the European Union, and McMaster University, Hamilton, Canada; has received consulting fees from Novo Nordisk, AstraZeneca, Bayer, and Boehringer Ingelheim; has received honoraria from Novo Nordisk, AstraZeneca, Bayer, and Novartis; and has participated on a data safety monitoring board or advisory board for AstraZeneca, Bayer, Sanofi, and Boehringer Ingelheim, as well as a leadership role in the Kidney Disease: Improving Global Outcomes group. Dr MacIsaac was a FLOW trial investigator and member of the FLOW global expert panel; has received research grants from Novo Nordisk, Servier, Medtronic, The Rebecca Cooper Medical Research Foundation, St Vincent’s Research Foundation, The Juvenile Diabetes Research Foundation, Grey Innovations, The Diabetes Australia Research Trust/Program, and The National Health and Medical Research Council of Australia; has received honoraria for lectures from Eli Lilly, Novo Nordisk, Sanofi, AstraZeneca, MSD, Novartis, and Boehringer Ingelheim; has been on the advisory boards for Novo Nordisk, Boehringer Ingelheim-Eli Lilly Diabetes Alliance, AstraZeneca, and MSD; has received travel support from Novo Nordisk, Sanofi, Boehringer Ingelheim, and AstraZeneca; and has been a principal investigator for industry-sponsored clinical trials run by Novo Nordisk, Sanofi, Bayer, Johnson-Cilag, and AbbVie. Dr Kosiborod has received research grant support from AstraZeneca and Boehringer Ingelheim; has served as a consultant or on an advisory board for Amgen, Applied Therapeutics, AstraZeneca, Bayer, Boehringer Ingelheim, Eli Lilly, Esperion Therapeutics, Janssen, Merck (Diabetes and Cardiovascular), Novo Nordisk, Sanofi, and Vifor Pharma; has received other research support from AstraZeneca; and has received honoraria from AstraZeneca, Boehringer Ingelheim, and Novo Nordisk. Dr Kamenov has received speaker fees from Actavis, AstraZeneca, Bayer-Schering, Berlin Chemie, Boehringer Ingelheim, Eli Lilly, KRKA, Merck, MLD, MSD (Merck), Mundipharma, Mylan, Novartis, Novo Nordisk, Pfizer, Sandoz, Sanofi, Servier, TEVA Pharmaceuticals, Valentis, Vedra, and Viatris. Dr Hadjadj has received grants from Asdia, Asten, AstraZeneca, Homeperf, LVL, Nestle Home Care, Pierre Fabre, and VitalAire; has received consulting fees from AstraZeneca, Bayer, Boehringer Ingelheim, Eli Lilly, Novo Nordisk, Sanofi, Servier, and Valbiotis; has received speaker fees from Abbott, AstraZeneca, Boehringer Ingelheim, Bayer, Dino Santé, Eli Lilly, Novartis, Novo Nordisk, Pierre Fabre, Sanofi, Servier, and Valbiotis; and has received meeting invitations from AstraZeneca, Abbott, Dino Santé, Eli Lilly, and Novo Nordisk. Dr Bakris has received consulting fees from Bayer, KBP Biosciences, Ionis, Alnylam, AstraZeneca, Quantum Genomics, Novo Nordisk, and Dia Medica Therapeutics. Dr Mahaffey has received grants from the American Heart Association, Apple, Bayer, California Institute Regenerative Medicine, CSL Behring, Eidos, Ferring, Gilead, Google (Verify), Idorsia, Johnson and Johnson, Luitpold, Novartis, PAC-12, Precordior, and Sanifit; and has received consulting fees from Applied Therapeutics, Bayer, Bristol Myers Squibb, BridgeBio, CSL Behring, Elsevier, Fosun Pharma, Human, Johnson and Johnson, Moderna, Myokardia, Novartis, Novo Nordisk, Otsuka, PhaseBio, Portola, Quidel, and Theravance; and holds equity in Human, Medeloop, Precordior and Regencor. Drs Rasmussen, Nielsen, Idorn, Hansen, and Baeres are employees of and shareholders in Novo Nordisk., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)