Systematic review and meta-analysis of complications and mortality of veno-venous extracorporeal membrane oxygenation for refractory acute respiratory distress syndrome

Annals of Intensive Care

Table 1 Main excluded studies

Study	Year	Patients	Reason for exclusion
Lehle et al. [42]	2014	317	No complications reported
Cheng et al. [43]	2013	216	Unable to identify data associated with veno-venous ECMO
Schmid et al. [44]	2012	176	Risk of patient overlap (duplicate)
Hemmila et al. [28]	2004	168	>10% veno-arterial ECMO
Bartlett et al. [45]	2000	146	>10% veno-arterial ECMO
Camboni et al. [26]	2011	127	Risk of patient overlap (duplicate)
Lindskov et al. [46]	2013	124	>10% veno-arterial ECMO
Pham et al. [35]	2013	123	>10% veno-arterial ECMO
Pranikoff et al. [47]	1999	94	Risk of bias
Bein et al. [48]	2006	90	Arterio-venous CO₂ removal
Nehra et al. [49]	2009	81	Reports patients <18 years
Rubino et al. [50]	2014	72	Risk of bias
Liebold et al. [51]	2002	70	Reports patients <18 years
Chiu et al. [52]	2015	65	No complications reported
Pappalardo et al. [53]	2013	60	ELSO database
Ma et al. [54]	2012	56	Risk of bias
Chimot et al. [55]	2013	52	Risk of bias
Pranikoff et al. [56]	1994	51	>10% veno-arterial ECMO
Zimmermann et al. [57]	2009	51	Arterio-venous CO₂ removal
Peek et al. [58]	1997	50	Reports patients <18 years