Citation	Primary Reason for Exclusion
Ahn C, Kim W, Cho Y, Choi KS, Jang BH, Lim TH. Efficacy of extracorporeal cardiopulmonary resuscitation compared to conventional cardiopulmonary resuscitation for adult cardiac arrest patients: a systematic review and meta-analysis. Scientific Reports. 2016;6:34208.	Not explicitly refractory cardiac arrest
Beyea MM, Tillmann BW, Iansavichene AE, Randhawa VK, Van Aarsen K, Nagpal AD. Neurologic outcomes after extracorporeal membrane oxygenation assisted CPR for resuscitation of out-of-hospital cardiac arrest patients: a systematic review. Resuscitation. 2018;130():146–158.	Not explicitly refractory cardiac arrest
Biancari F, Perrotti A, Dalen M, Guerrieri M, Fiore A, Reichart D, et al. Meta-analysis of the outcome after postcardiotomy venoarterial extracorporeal membrane oxygenation in adult patients. Journal of Cardiothoracic and Vascular Anesthesia 2018;32(3):1175–1182.	No comparator
Caceres M, Esmailian F, Moriguchi JD, Arabia FA, Czer LS. Mechanical circulatory support in cardiogenic shock following an acute myocardial infarction: a systematic review Journal of Cardiac Surgery 2014;29(5):743–51.	Not explicitly refractory cardiogenic shock
Cesana F, Avalli L, Garatti L, Coppo A, Righetti S, Calchera I, et al. Effects of extracorporeal cardiopulmonary resuscitation on neurological and cardiac outcome after ischaemic refractory cardiac arrest. European Heart Journal: Acute Cardiovascular Care. 2018;7(5):432–441.	Not all refractory cardiac arrest
Charon C, Allyn J, Bouchet B, Nativel F, Braunberger E, Brulliard C, et al. Ten thousand kilometre transfer of cardiogenic shock patients on venoarterial extracorporeal membrane oxygenation for emergency heart transplantation: cooperation between Reunion Island and Metropolitan France. European Heart Journal: Acute Cardiovascular Care 2018;7(4):371–378.	Wrong setting
Cheng R, Hachamovitch R, Kittleson M, Patel J, Arabia F, Moriguchi J, et al. Complications of extracorporeal membrane oxygenation for treatment of cardiogenic shock and cardiac arrest: a meta-analysis of 1,866 adult patients. Annals of Thoracic Surgery. 2014;97(2):610–6.	No comparator
Cheng R, Hachamovitch R, Kittleson M, Patel J, Arabia F, Moriguchi J, et al. Clinical outcomes in fulminant myocarditis requiring extracorporeal membrane oxygenation: a weighted meta-analysis of 170 patients. Journal of Cardiac Failure. 2014;20(6):400–6.	No comparator
El Sibai R, Bachir R, El Sayed M. Outcomes in cardiogenic shock patients with extracorporeal membrane oxygenation use: a matched cohort study in hospitals across the United States. BioMed Research International. 2018:2428648.	No details about non-ECMO; not specifically VA ECMO; no age criteria
Ellouze O, Vuillet M, Perrot J, Grosjean S, Missaoui A, Aho S, et al. Comparable outcome of out-of-hospital cardiac arrest and in-hospital cardiac arrest treated with extracorporeal life support. Artificial Organs. 2018;42(1):15–21.	Wrong comparator
Fukuhara S, Takeda K, Kurlansky PA, Naka Y, Takayama H. Extracorporeal membrane oxygenation as a direct bridge to heart transplantation in adults. Journal of Thoracic and Cardiovascular Surgery. 2018;155(4):1607–1618.e6.	Wrong indication
Haneya A, Philipp A, Diez C, Schopka S, Bein T, Zimmermann M, et al. A 5-year experience with cardiopulmonary resuscitation using extracorporeal life support in non-postcardiotomy patients with cardiac arrest. Resuscitation. 2012;83(11):1331–7.	Letter to the editor
Hsu PS, Chen JL, Hong GJ, Tsai YT, Lin CY, Lee CY, et al. Extracorporeal membrane oxygenation for refractory cardiogenic shock after cardiac surgery: predictors of early mortality and outcome from 51 adult patients. European Journal of Cardio-Thoracic Surgery. 2010;37(2):328–33.	No comparator
Jung C, Janssen K, Kaluza M, Fuernau G, Poerner TC, Fritzenwanger M, et al. Outcome predictors in cardiopulmonary resuscitation facilitated by extracorporeal membrane oxygenation. Clinical Research in Cardiology. 2016;105(3):196–205.	No comparator
Shin TG, Choi JH, Jo IJ, Sim MS, Song HG, Jeong YK.; et al. Extracorporeal cardiopulmonary resuscitation in patients with inhospital cardiac arrest: a comparison with conventional cardiopulmonary resuscitation. Critical Care Medicine. 2011;39(1):1–7.	Superseded by more recent study
Xie A, Phan K, Tsai YC, Yan TD, Forrest P. Venoarterial extracorporeal membrane oxygenation for cardiogenic shock and cardiac arrest: a meta-analysis. Journal of Cardiothoracic and Vascular Anesthesia. 2015;29(3):637–45.	No comparator