ABC | Volume 113, Nº2, August 2019

Short Editorial Ferrari & Menegazzo Global longitudinal strain or measurement of ejection fraction? Arq Bras Cardiol. 2019; 113(2):195-196 1. Bloom MW, Greenberg B, Jaarsma T, Januzzi JL, Lam CSP, Maggioni AP, et al. Heart failure with reduced ejection fraction. Nat Rev Dis Primers. 2017 Aug 24;3:17058. 2. Savarese G, Lund LH. Global Public Health Burden of Heart Failure. Card Fail Rev. 2017;3(1):7-11. 3. AlbuquerqueDC,NetoJD,BacalF,RohdeLE,Bernardez-PereiraS,Berwanger O, et al. I brazilian registry of heart failure - clinical aspects, care quality and hospitalization outcomes. Arq Bras Cardiol. 2015;104(6):433-42. 4. ChoiHM,ParkMS,Youn JC.Updateonheart failuremanagementand future directions. Korean J Intern Med. 2019;34(1):11-43. 5. Arena R, Myers J, Guazzi M. The clinical importance of cardiopulmonary exercise testing and aerobic training in patients with heart failure. Rev Bras Fisioter. 2008;12(2):75-87. 6. ManciniDM,EisenH,KussmaulW,MullR,EdmondsLHJr,WilsonJR.Valueof peakexerciseoxygenconsumptionforoptimaltimingofcardiactransplantation in ambulatory patients with heart failure. Circulation. 1991;83(3):778-86. 7. Myers J, Arena R, Dewey F, Bensimhon D, Abella J, Hsu L, et al. A cardiopulmonary exercise testing score for predicting outcomes in patients with heart failure. AmHeart J. 2008;156(6):1177-83. 8. Leite JJ, Mansur AJ, De Freitas HF, Chizola PR, Bocchi EA, Terra-FilhoM, et al. Periodic breathing during incremental exercise predicts mortality in patients with chronic heart failure evaluated for cardiac transplantation. J Am Coll Cardiol. 2003;41(12):2175-81. 9. Owan TE, Hodge DO, Herges RM, Jacobsen SJ, Roger VL, Redfield MM. Trends in prevalence and outcome of heart failure with preserved ejection fraction. N Engl J Med. 2006;355(3):251-9. 10. Marwick TH, Shah SJ, Thomas JD. Myocardial strain in the assessment of patients with heart failure: a review. JAMA Cardiol. 2019 Feb 27. [Epub ahead of print]. 11. Park JJ,Park JB,Park JH,ChoGY.Global longitudinalstraintopredictmortality in patients with acute heart failure. J AmColl Cardiol. 2018;71(18):1947-57. 12. Sengeløv M, Jørgensen PG, Jensen JS, Bruun NE, Olsen FJ, Fritz-Hansen T, et al. Global longitudinal strain is a superior predictor of all-cause mortality in heart failure with reduced ejection fraction. JACC Cardiovasc Imaging. 2015;8(12):1351-59. 13. Maia RJC, Brandão SCS, Brandão DC, Leite J, Parente GB, Pinheiro F, et al. Global Longitudinal Strain Predicts Poor Functional Capacity in Patients with Systolic Heart Failure. Arq Bras Cardiol. 2019; 113(2):188-194. References This is an open-access article distributed under the terms of the Creative Commons Attribution License Nevertheless, the study by Maia et al. 13 has important issues that should be addressed. The low sample size is a significant limitation of the study, making it impossible to extrapolate the data and use them routinely in clinical practice. Also, the study was not designed and did not have the power to demonstrate the prognostic impact of the findings. On the other hand, the data corroborate previous findings of the literature, indicating that the smaller the GLS value found, the poorer the functional capacity of the individual tends to be; these data are relevant, as they predict a worse prognosis. These outcomes help open new doors and perspectives for further studies in this field, which could confirm important messages conveyed in the literature and strengthened by Brazilian authors. 196