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Kitai T, Kohsaka S, Kato T, Kato E, Sato K, Teramoto K, et al. JCS\/JHFS 2025 Guideline on diagnosis and treatment of heart failure. <i>Circ J<\/i> 2025; 89: 1278\u20131444.","DOI":"10.1253\/circj.CJ-25-0002"},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. Shibata T, Kanaoka K, Iwanaga Y, Sumita Y, Matoba S, Ieda M, et al. Design and framework of JROAD-DPC: A Japanese nationwide registry linking diagnosis procedure combination data with cardiovascular quality metrics. <i>Circ Rep<\/i> 2026; 8: 180\u2013189.","DOI":"10.1253\/circrep.CR-25-0217"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Naser JA, Michelena HI, Lin G, Scott CG, Lee E, Kennedy AM, et al. Incidence, risk factors, and outcomes of atrial functional mitral regurgitation in patients with atrial fibrillation or sinus rhythm. <i>Eur Heart J Cardiovasc Imaging<\/i> 2023; 24: 1450\u20131457.","DOI":"10.1093\/ehjci\/jead199"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. 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Daimon M. Normal values of echocardiographic parameters in relation to age in a healthy Japanese population. <i>Circ J<\/i> 2008; 72: 1859\u20131866.","DOI":"10.1253\/circj.CJ-08-0171"},{"key":"15","doi-asserted-by":"crossref","unstructured":"15. Bozkurt B, Coats AJS, Tsutsui H, Abdelhamid M, Adamopoulos S, Albert N, et al. Universal definition and classification of heart failure. <i>J Card Fail<\/i> 2021; 27: 387\u2013413.","DOI":"10.1016\/j.cardfail.2021.01.022"},{"key":"16","doi-asserted-by":"crossref","unstructured":"16. Inker LA, Eneanya ND, Coresh J, Tighiouart H, Wang D, Sang Y, et al. New creatinine- and cystatin C-based equations to estimate GFR without race. <i>N Engl J Med<\/i> 2021; 385: 1737\u20131749.","DOI":"10.1056\/NEJMoa2102953"},{"key":"17","unstructured":"17. World Health Organization. Nutritional anemia: Report of a WHO Scientific Group World Health Organization. Geneva: World Health Organization, 1968. https:\/\/www.scirp.org\/reference\/referencespapers?referenceid=1947358 (accessed March 23, 2026)."},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. Okada T, Kagiyama N, Kaneko T, Amano M, Sato Y, Ohno Y, et al. Echocardiographic cardiac damage classification and clinical outcomes in atrial functional mitral regurgitation. <i>Heart<\/i> 2025; 111: 532\u2013540.","DOI":"10.1136\/heartjnl-2024-325240"},{"key":"19","doi-asserted-by":"crossref","unstructured":"19. Murata A, Kaneko T, Amano M, Sato Y, Ohno Y, Obokata M, et al. Qualitative and quantitative assessment of atrial functional mitral regurgitation: Analysis from the REVEAL-AFMR registry. <i>Eur Heart J Cardiovasc Imaging<\/i> 2025; 26: 299\u2013306.","DOI":"10.1093\/ehjci\/jeae288"},{"key":"20","doi-asserted-by":"crossref","unstructured":"20. Omori N, Amano M, Kaneko T, Sato Y, Ohno Y, Obokata M, et al. Factors associated with and prognosis of atriogenic tethering in patients with atrial functional mitral regurgitation. <i>Circ J<\/i> 2025, doi:10.1253\/circj.CJ-25-0465.","DOI":"10.1253\/circj.CJ-25-0465"},{"key":"21","doi-asserted-by":"crossref","unstructured":"21. Scrutinio D, Passantino A, Santoro D, Catanzaro R. The cardiorenal anaemia syndrome in systolic heart failure: Prevalence, clinical correlates, and long-term survival. <i>Eur J Heart Fail<\/i> 2011; 13: 61\u201367.","DOI":"10.1093\/eurjhf\/hfq167"},{"key":"22","doi-asserted-by":"crossref","unstructured":"22. Pallangyo P, Fredrick F, Bhalia S, Nicholaus P, Kisenge P, Mtinangi B, et al. Cardiorenal anemia syndrome and survival among heart failure patients in Tanzania: A prospective cohort study. <i>BMC Cardiovasc Disord<\/i> 2017; 17: 59.","DOI":"10.1186\/s12872-017-0497-2"},{"key":"23","doi-asserted-by":"crossref","unstructured":"23. Llauger L, Jacob J, Herrero-Puente P, Aguirre A, Sunen-Cuquerella G, Corominas-Lasalle G, et al. The CRAS-EAHFE study: Characteristics and prognosis of acute heart failure episodes with cardiorenal-anaemia syndrome at the emergency department. <i>Eur Heart J Acute Cardiovasc Care<\/i> 2020; 9: 406\u2013418.","DOI":"10.1177\/2048872620921602"},{"key":"24","doi-asserted-by":"crossref","unstructured":"24. Kajimoto K, Sato N, Keida T, Sakata Y, Takano T. Associations of anemia and renal dysfunction with outcomes among patients hospitalized for acute decompensated heart failure with preserved or reduced ejection fraction. <i>Clin J Am Soc Nephrol<\/i> 2014; 9: 1912\u20131921.","DOI":"10.2215\/CJN.04400514"},{"key":"25","doi-asserted-by":"crossref","unstructured":"25. Al-Jarallah M, Rajan R, Al-Zakwani I, Dashti R, Bulbanat B, Sulaiman K, et al. Incidence and impact of cardiorenal anaemia syndrome on all-cause mortality in acute heart failure patients stratified by left ventricular ejection fraction in the Middle East. <i>ESC Heart Fail<\/i> 2019; 6: 103\u2013110.","DOI":"10.1002\/ehf2.12351"},{"key":"26","doi-asserted-by":"crossref","unstructured":"26. Ujiro S, Fujimoto W, Takemoto M, Kuroda K, Yamashita S, Imanishi J, et al. Impact of cardiorenal anemia syndrome on the prognosis of patients with chronic heart failure in Japan: Insights from the KUNIUMI Registry Chronic Cohort. <i>Circ J<\/i> 2025; 89: 463\u2013469.","DOI":"10.1253\/circj.CJ-24-0957"},{"key":"27","unstructured":"27. Shoin W, Ebisawa S, Saigusa T, Sakai T, Oguchi Y, Okada A. Prognostic impact of cardio-renal-anemia syndrome in patients at risk for heart failure from the IMPACT-ABI study. <i>Shinshu Med J<\/i> 2020; 68: 139\u2013147."},{"key":"28","doi-asserted-by":"crossref","unstructured":"28. 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Impact of renal impairment on atrial fibrillation: ESC-EHRA EORP-AF Long-Term General Registry. <i>Eur J Clin Invest<\/i> 2022; 52: e13745.","DOI":"10.1111\/eci.13745"},{"key":"34","doi-asserted-by":"crossref","unstructured":"34. Tu SJ, Hanna-Rivero N, Elliott AD, Clarke N, Huang S, Pitman BM, et al. Associations of anemia with stroke, bleeding, and mortality in atrial fibrillation: A systematic review and meta-analysis. <i>J Cardiovasc Electrophysiol<\/i> 2021; 32: 686\u2013694.","DOI":"10.1111\/jce.14898"},{"key":"35","doi-asserted-by":"crossref","unstructured":"35. Praz F, Borger MA, Lanz J, Marin-Cuartas M, Abreu A, Adamo M, et al. 2025 ESC\/EACTS Guidelines for the management of valvular heart disease. <i>Eur Heart J<\/i> 2025; 46: 4635\u20134736.","DOI":"10.1093\/ejcts\/ezaf393"},{"key":"36","doi-asserted-by":"crossref","unstructured":"36. Izumi C, Eishi K, Ashihara K, Arita T, Otsuji Y, Kunihara T, et al. JCS\/JSCS\/JATS\/JSVS 2020 Guidelines on the management of valvular heart disease. <i>Circ J<\/i> 2020; 84: 2037\u20132119.","DOI":"10.1253\/circj.CJ-20-0135"},{"key":"37","doi-asserted-by":"crossref","unstructured":"37. Ferreira JP, Anker SD, Butler J, Filippatos G, Iwata T, Salsali A, et al. Impact of anaemia and the effect of empagliflozin in heart failure with reduced ejection fraction: Findings from EMPEROR-Reduced. <i>Eur J Heart Fail<\/i> 2022; 24: 708\u2013715.","DOI":"10.1002\/ejhf.2409"},{"key":"38","doi-asserted-by":"crossref","unstructured":"38. Shoda M, Takami M, Imamura K, Tani KI, Iwai H, Nakanishi Y, et al. Predictors of sinus rhythm maintenance after catheter ablation in atrial fibrillation patients with significant atrial functional mitral regurgitation. <i>Circ Rep<\/i> 2025; 7: 1190\u20131198.","DOI":"10.1253\/circrep.CR-25-0087"},{"key":"39","doi-asserted-by":"crossref","unstructured":"39. Alnuwaysir RIS, Grote Beverborg N, Hoes MF, Markousis-Mavrogenis G, Gomez KA, van der Wal HH, et al. Additional burden of iron deficiency in heart failure patients beyond the cardio-renal anaemia syndrome: Findings from the BIOSTAT-CHF study. <i>Eur J Heart Fail<\/i> 2022; 24: 192\u2013204.","DOI":"10.1002\/ejhf.2393"},{"key":"40","doi-asserted-by":"crossref","unstructured":"40. Ponikowski P, Mentz RJ, Hernandez AF, Butler J, Khan MS, van Veldhuisen DJ, et al. Efficacy of ferric carboxymaltose in heart failure with iron deficiency: An individual patient data meta-analysis. <i>Eur Heart J<\/i> 2023; 44: 5077\u20135091.","DOI":"10.1093\/eurheartj\/ehad586"},{"key":"41","doi-asserted-by":"crossref","unstructured":"41. Ahmed M, Shafiq A, Javaid H, Singh P, Shahbaz H, Maniya MT, et al. Intravenous iron therapy for heart failure and iron deficiency: An updated meta-analysis of randomized clinical trials. <i>ESC Heart Fail<\/i> 2025; 12: 43\u201353.","DOI":"10.1002\/ehf2.14905"},{"key":"42","doi-asserted-by":"crossref","unstructured":"42. Silverberg DS, Wexler D, Iaina A, Schwartz D. The role of anemia in the progression of congestive heart failure: Is there a place for erythropoietin and intravenous iron? <i>Transfus Alternatives Transfus Med<\/i> 2008; 6: 26\u201337.","DOI":"10.1111\/j.1778-428X.2005.tb00121.x"},{"key":"43","doi-asserted-by":"crossref","unstructured":"43. Silverberg DS, Wexler D, Blum M, Keren G, Sheps D, Leibovitch E, et al. The use of subcutaneous erythropoietin and intravenous iron for the treatment of the anemia of severe, resistant congestive heart failure improves cardiac and renal function and functional cardiac class, and markedly reduces hospitalizations. <i>J Am Coll Cardiol<\/i> 2000; 35: 1737\u20131744.","DOI":"10.1016\/S0735-1097(00)00613-6"},{"key":"44","doi-asserted-by":"crossref","unstructured":"44. Swedberg K, Young JB, Anand IS, Cheng S, Desai AS, Diaz R, et al. Treatment of anemia with darbepoetin alfa in systolic heart failure. <i>N Engl J Med<\/i> 2013; 368: 1210\u20131219.","DOI":"10.1056\/NEJMoa1214865"},{"key":"45","doi-asserted-by":"crossref","unstructured":"45. Jackevicius CA, Fan CS, Warner A. Clinical outcomes of erythropoietin use in heart failure patients with anemia of chronic kidney disease. <i>J Card Fail<\/i> 2014; 20: 327\u2013333.","DOI":"10.1016\/j.cardfail.2014.02.001"},{"key":"46","doi-asserted-by":"crossref","unstructured":"46. Hida Y, Imamura T, Kinugawa K. Clinical implication of HIF-PH Inhibitor in patients with heart failure, chronic kidney disease, and renal anemia. <i>J Clin Med<\/i> 2024; 13: 7619.","DOI":"10.3390\/jcm13247619"},{"key":"47","doi-asserted-by":"crossref","unstructured":"47. Tsutsui H, Isobe M, Ito H, Ito H, Okumura K, Ono M, et al. 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