Enteral omega-3 fatty acid supplementation in adult patients with acute respiratory distress syndrome: a systematic review of randomized controlled trials with meta-analysis and trial sequential analysis
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Controversy remains as to whether enteral supplementation of ω-3 fatty acids (FA) could improve outcomes in patients with acute respiratory distress syndrome (ARDS). Thus, we did a meta-analysis and aimed to investigate the benefit and harm of enteral ω-3 FA supplementation in adult patients with ARDS.
Databases including PubMed, Embase, the Cochrane Register of Controlled Trials, and Google Scholar were searched to find relevant articles. Randomized controlled trials (RCTs) comparing enteral ω-3 FA supplementation with a control or placebo intervention in adult patients with ARDS were included. The primary outcome was all-cause 28-day mortality. We used the Cochrane Collaboration methodology.
Seven RCTs with 955 adult patients qualified for inclusion, and all the selected trials were considered as at high risk of bias. The use of enteral ω-3 FA did not significantly reduce all-cause 28-day mortality [relative risk (RR), 0.90; 95 % confidence intervals (CI), 0.68–1.18; p = 0.44; I 2 = 31 %; random effects]. Trial sequential analysis indicated lack of firm evidence for a 20 % RR reduction in all-cause 28-day mortality. PaO2/FiO2 ratio was significantly increased in the ω-3 FA group on day 4 [weighted mean difference (WMD), 45.14; 95 % CI, 16.77–73.51; p = 0.002; I 2 = 86 %; random effects] and day 7 (WMD, 33.10; 95 % CI, 1.67–64.52; p = 0.04; I 2 = 88 %; random effects). Meta-analysis using a random effects model showed no significant differences in ventilator-free days (VFD) (WMD, 2.47 days; 95 % CI, −2.85 to 7.79; p = 0.36; I 2 = 91 %) or intensive care unit-free days (ICU) (WMD, 2.31 days; 95 % CI, −2.34 to 6.97; p = 0.33; I 2 = 89 %) between the two groups.
Among patients with ARDS, enteral supplementation of ω-3 FA seemed ineffective regarding all-cause 28-day mortality, VFD, and ICU-free days. Routine use of enteral ω-3 FA cannot be recommended based on the available evidence.
KeywordsAcute respiratory distress syndrome ω-3 fatty acids Mortality Meta-analysis
Conflicts of interest
- 1.Villar J, Pérez-Méndez L, Blanco J, Añón JM, Blanch L, Belda J, Santos-Bouza A, Fernández RL, Kacmarek RM (2013) Spanish Initiative for Epidemiology, Stratification, and Therapies for ARDS (SIESTA) Network: A universal definition of ARDS: the PaO2/FiO2 ratio under a standard ventilatory setting––a prospective, multicenter validation study. Intensive Care Med 39(4):583–592PubMedCrossRefGoogle Scholar
- 2.Ferguson ND, Fan E, Camporota L, Antonelli M, Anzueto A, Beale R, Brochard L, Brower R, Esteban A, Gattinoni L, Rhodes A, Slutsky AS, Vincent JL, Rubenfeld GD, Thompson BT, Ranieri VM (2012) The Berlin definition of ARDS: an expanded rationale, justification, and supplementary material. Intensive Care Med 38:1573–1582PubMedCrossRefGoogle Scholar
- 4.Villar J, Blanco J, Anon JM, Santos-Bouza A, Blanch L, Ambros A, Gandia F, Carriedo D, Mosteiro F, Basaldua S, Fernandez RL, Kacmarek RM (2011) The ALIEN study: incidence and outcome of acute respiratory distress syndrome in the era of lung protective ventilation. Intensive Care Med 37:1932–1941PubMedCrossRefGoogle Scholar
- 6.McClave SA, Martindale RG, Vanek VW, McCarthy M, Roberts P, Taylor B, Ochoa JB, Napolitano L, Cresci G (2009) Guidelines for the provision and assessment of nutrition support therapy in the adult critically III patient: society of Critical Care Medicine (SCCM) and American Society for Parenteral and Enteral Nutrition (A.S.P.E.N.). JPEN J Parenter Enteral Nutr 33:277–316PubMedCrossRefGoogle Scholar
- 7.Pacht ER, DeMichele SJ, Nelson JL, Hart J, Wennberg AK, Gadek JE (2003) Enteral nutrition with eicosapentaenoic acid, gamma-linolenic acid, and antioxidants reduces alveolar inflammatory mediators and protein influx in patients with acute respiratory distress syndrome. Crit Care Med 31:491–500PubMedCrossRefGoogle Scholar
- 9.Grau-Carmona T, Moran-Garcia V, Garcia-de-Lorenzo A, Heras-de-la-Calle G, Quesada-Bellver B, Lopez-Martinez J, Gonzalez-Fernandez C, Montejo-Gonzalez JC, Blesa-Malpica A, Albert-Bonamusa I, Bonet-Saris A, Herrero-Meseguer JI, Mesejo A, Acosta J (2011) Effect of an enteral diet enriched with eicosapentaenoic acid, gamma-linolenic acid and anti-oxidants on the outcome of mechanically ventilated, critically ill, septic patients. Clin Nutr 30:578–584PubMedCrossRefGoogle Scholar
- 11.Stapleton RD, Martin TR, Weiss NS, Crowley JJ, Gundel SJ, Nathens AB, Akhtar SR, Ruzinski JT, Caldwell E, Curtis JR, Heyland DK, Watkins TR, Parsons PE, Martin JM, Wurfel MM, Hallstrand TS, Sims KA, Neff MJ (2011) A phase II randomized placebo-controlled trial of omega-3 fatty acids for the treatment of acute lung injury. Crit Care Med 39:1655–1662PubMedCentralPubMedCrossRefGoogle Scholar
- 13.Higgins JPT, Green S (2011) Cochrane handbook for systematic reviews of interventions Version 5.1.0. The Cochrane Collaboration. http://handbook.cochrane.org. Accessed 28 Jan 2014
- 21.Gadek JE, DeMichele SJ, Karlstad MD, Pacht ER, Donahoe M, Albertson TE, Van Hoozen C, Wennberg AK, Nelson JL, Noursalehi M (1999) Effect of enteral feeding with eicosapentaenoic acid, gamma-linolenic acid, and antioxidants in patients with acute respiratory distress syndrome. Enteral Nutrition in ARDS Study Group. Crit Care Med 27:1409–1420PubMedCrossRefGoogle Scholar
- 27.Antonelli M, Bonten M, Chastre J, Citerio G, Conti G, Curtis JR, De Backer D, Hedenstierna G, Joannidis M, Macrae D, Mancebo J, Maggiore SM, Mebazaa A, Preiser JC, Rocco P, Timsit JF, Wernerman J, Zhang H (2012) Year in review in Intensive Care Medicine 2011: III. ARDS and ECMO, weaning, mechanical ventilation, noninvasive ventilation, pediatrics and miscellanea. Intensive Care Med 38:542–556PubMedCentralPubMedCrossRefGoogle Scholar