REFERENCES
  1. De Marco M, Gerdts E, Mancusi C, et al. Influence of Left Ventricular Stroke Volume on Incident Heart Failure in a Population With Preserved Ejection Fraction (from the Strong Heart Study). Am J Cardiol 2017;119:1047–1052.
  2. Kamperidis V, van Wijngaarden SE, van Rosendael PJ, et al. Restrictive Mitral Valve Annuloplasty: Prognostic Implications of Left Ventricular Forward Flow. Ann Thorac Surg 2017;104:1464–1470.
  3. Mele D, Pestelli G, Molin DD, et al. Echocardiographic Evaluation of Left Ventricular Output in Patients with Heart Failure: A Per-Beat or Per-Minute Approach? J Am Soc Echocardiogr 2020;33:135-47.
  4. Mele D, Pestelli G, Dini FL, et al. Novel echocardiographic approach to hemodynamic phenotypes predicts outcome of patients hospitalized with heart failure. Circ Cardiovasc Imaging 2020;13:e009939.
  5. Baumgartner H, Bonhoeffer P, De Groot NMS, et al. ESC Guidelines for the management of grown-up congenital heart disease (new version 2010). Eur Heart J 2010;31:2915–2957.
  6. Rusinaru D, Bohbot Y, Ringle A, et al. Impact of low stroke volume on mortality in patients with severe aortic stenosis and preserved left ventricular ejection fraction. Eur Heart J 2018;39:1992-1999.
  7. Baumgartner H, Hung J, Bermejo J, et al. Recommendations on the echocardiographic assessment of aortic valve stenosis: A focused update from the European Association of Cardiovascular Imaging and the American Society of Echocardiography. J Am Soc Echocardiogr 2017;30:372-392.
  8. Falk V, Baumgartner H, Bax JJ, et al. 2017 ESC/EACTS Guidelines for the management of valvular heart disease. Eur J Cardiothorac Surg 2017;52:616-664.
  9. Lewis JF, Kuo LC, Nelson JG, et al. Pulsed Doppler echocardiographic determination of stroke volume and cardiac output: clinical validation of two new methods using the apical window. Circulation 1984;70:425-31.
  10. Otto CM, Pearlman AS, Gardner CL. Hemodynamic progression of aortic stenosis in adults assessed by Doppler echocardiography. J Am Coll Cardiol 1989;13:545-50.
  11. Zoghbi WA, Farmer KL, Soto JG, et al. Accurate noninvasive quantification of stenotic aortic valve area by Doppler echocardiography. Circulation 1986;73:452-9.
  12. Myreng Y, Molstad P, Endresen K, et al. Reproducibility of echocardiographic estimates of the area of stenosed aortic valves using the continuity equation. Int J Cardiol 1990;26:349-59.
  13. Raggi P, Vasavada BC, Rodney E, et al. Doppler echocardiographic methods to estimate severity of aortic stenosis. Am J Cardiol 1995;76:615-8.
  14. Leye M, Brochet E, Lepage L, et al. Size-Adjusted Left Ventricular Outflow Tract Diameter Reference Values: A Safeguard for the Evaluation of the Severity of Aortic Stenosis. J Am Soc Echocardiogr 2009;22:445–451.
  15. Goldman JH, Schiller NB, Lim DC, et al. Usefulness of stroke distance by echocardiography as a surrogate marker of cardiac output that is independent of gender and size in a normal population. Am J Cardiol 2001;87:499–502.
  16. Mele D, Pestelli G, Smarrazzo V, et al. Left Ventricular Output Indices In Hospitalized Heart Failure: When “Simpler” May Not Mean “Better”. Int J Cardiovasc Imaging 2020; https://doi.org/10.1007/s10554-020-01946-x.
  17. Lang RM, Badano LP, Mor-Avi V, et al. Recommendations for cardiac chamber quantification by echocardiography in adults: an update from the American society of echocardiography and the European association of cardiovascular imaging. J Am Soc Echocardiogr 2015;28:1-39.
  18. Roman MJ, Devereux RB, Kramer-Fox R, et al. Two-dimensional echocardiographic aortic root dimensions in normal children and adults. Am J Cardiol 1989;64:507–512.
  19. Saura D, Dulgheru R, Caballero L, et al. Two-dimensional transthoracic echocardiographic normal reference ranges for proximal aorta dimensions: results from the EACVI NORRE study. Eur Heart J Cardiovasc Imaging 2017;18:167–179.
  20. Mosteller RD. Simplified calculation of body-surface area. N Engl J Med 1987;317:1098.
  21. Flachskampf FA, Wouters PF, Edvardsen T, et al. Recommendations for transoesophageal echocardiography: EACVI update 2014. Eur Heart J Cardiovasc Imaging 2014;15:353-365.
  22. Lewis JF, Kuo LC, Nelson JG, et al. Pulsed Doppler echocardiographic determination of stroke volume and cardiac output: clinical validation of two new methods using the apical window. Circulation 1984;70:425–431
  23. Labovitz AJ, Buckingham TA, Habermehl K, et al. The effects of sampling site on the twodimensional echo-Doppler determination of cardiac output. Am Heart J 1985;109:327–332.
  24. Dittmann H, Voelker W, Karsch KR, et al. Influence of sampling site and flow area on cardiac output measurements by Doppler echocardiography. J Am Coll Cardiol 1987;10:818–823.
  25. Dericbourg C, Tribouilloy C, Kugener H, et al. Noninvasive measurement of cardiac output by pulsed Doppler echocardiography. Correlation with thermodilution. Arch Mal Coeur Vaiss 1990;83:237–244.
  26. Gola A, Pozzoli M, Capomolla S, et al. Comparison of Doppler echocardiography with thermodilution for assessing cardiac output in advanced congestive heart failure. Am J Cardiol 1996;78:708–712.
  27. Stein JH, Neumann A, Preston LM, et al. Echocardiography for hemodynamic assessment of patients with advanced heart failure and potential heart transplant recipients. J Am Coll Cardiol 1997;30:1765–1772.
  28. Temporelli PL, Scapellato F, Eleuteri E, et al. Doppler echocardiography in advanced systolic heart failure. A noninvasive alternative to Swan-Ganz catheter. Circ Heart Fail 2010;3:387–394.
  29. Nagueh SF, Bhatt R, Vivo RP, et al. Echocardiographic evaluation of hemodynamics in patients with decompensated systolic heart failure. Circ Cardiovasc Imaging 2011;4:220–227.
  30. Reddy YNV, Melenovsky V, Redfield MM, et al. High-output heart failure: a 15-year experience. J Am Coll Cardiol 2016;68:473–482.
  31. Mele D, Andrade A, Bettencourt P, et al. From left ventricular ejection fraction to cardiac hemodynamics: role of echocardiography in evaluating patients with heart failure. Heart Fail Rev 2020;25:217–230.
  32. Rusinaru D, Malaquin D, Maréchaux S, et al. Relation of Dimensionless Index to Long-Term Outcome in Aortic Stenosis With Preserved LVEF. JACC Cardiovasc Imaging 2015;8:766–775.
  33. Whitener GB, Shanahan PC, Wolf BJ, et al. Grading Aortic Valve Stenosis With Dimensionless Index During Pre-cardiopulmonary Bypass Transesophageal Echocardiography: A Comparison With Transthoracic Echocardiography. J Cardiothorac Vasc Anesth 2019;33:2376–2384.
  34. Liu S, Churchill J, Hua L, et al. Direct Planimetry of Left Ventricular Outflow Tract Area by Simultaneous Biplane Imaging: Challenging the Need for a Circular Assumption of the Left Ventricular Outflow Tract in the Assessment of Aortic Stenosis. J Am Soc Echocardiogr 2020;33:461–468.
  35. Clavel MA, Malouf J, Messika-Zeitoun D, et al. Aortic valve area calculation in aortic stenosis by CT and Doppler echocardiography. JACC Cardiovasc Imaging 2015;8:248-57.
  36. Delgado V, Clavel M-A, Hahn RT, et al. How Do We Reconcile Echocardiography, Computed Tomography, and Hybrid Imaging in Assessing Discordant Grading of Aortic Stenosis Severity? JACC Cardiovasc Imaging 2019;12:267–282.
  37. Guzzetti E, Capoulade R, Tastet L, et al. Estimation of Stroke Volume and Aortic Valve Area in Patients with Aortic Stenosis: A Comparison of Echocardiography versus Cardiovascular Magnetic Resonance. J Am Soc Echocardiogr 2020;33:953-963.