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Eur J Pediatr Surg 2006; 16(6): 385-391
DOI: 10.1055/s-2006-924751
Original Article

Georg Thieme Verlag KG Stuttgart, New York · Masson Editeur Paris

Extracorporeal Membrane Oxygenation in Infants with Congenital Diaphragmatic Hernia: A Systematic Review of the Evidence

F. Morini1 , A. Goldman2 , A. Pierro1
  • 1Department of Paediatric Surgery, Institute of Child Health and Great Ormond Street Hospital for Children NHS Trust, London, UK
  • 2Cardiac Intensive Care Unit, Great Ormond Street Hospital for Children NHS Trust, London, UK
Further Information

Publication History

Received: May 1, 2006

Accepted after Revision: May 13, 2006

Publication Date:
08 January 2007 (online)

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Abstract

Aim: The aim of this study was to evaluate the evidence supporting the use of extracorporeal membrane oxygenation (ECMO) in infants with congenital diaphragmatic hernia (CDH) and severe respiratory failure. Methods: Medline, Embase, ISI Current Contents and Biosis databases were searched using a defined strategy. Case reports and opinion articles were excluded. We performed: 1) a systematic review of non randomised studies comparing mortality when ECMO was not available with a period when ECMO was available. Mortality was classified as “early” (before hospital discharge) and “late” (after discharge). Patients were classified as “ECMO” and “non-ECMO” candidates according to criteria reported by the authors; 2) a meta-analysis of randomised controlled trials (RCTs) comparing ECMO and conventional mechanical ventilation (CMV). Differences in mortality are reported as relative risk (RR) and 95 % confidence intervals. Results: a) Systematic review: 658 studies and 21 (2043 patients) fulfilled the entry criteria. Both early (RR 0.60 [0.51 - 0.70]; p < 0.001) and late mortality (RR 0.63 [0.53 - 0.73]; p < 0.001) were significantly lower when ECMO was available than when ECMO was unavailable. This difference in mortality was observed in “ECMO candidates” (RR 0.46 [0.32 - 0.68]; p < 0.001) but not in “non-ECMO candidates” (RR 0.80 [0.58 - 1.10]; p = 0.17). b) Meta-analysis: 3 trials comparing ECMO and conventional ventilation were identified which included 39 infants with CDH. The early mortality was significantly lower with ECMO compared to CMV (RR 0.73 [95 % CI 0.55 - 0.99]; p < 0.04), however, late mortality was similar in the two groups (RR 0.83 [0.66 - 1.05]; p = 0.12). Conclusions: Non randomised studies suggest a reduction in mortality with ECMO. However, differences in the indications for ECMO and improvements in other treatment modalities may contribute to this reduction. The meta-analysis of RCTs indicates a reduction in early mortality with ECMO but no long-term benefit. A large RCT in infants with CDH and severe respiratory failure is warranted.

Key words

Congenital diaphragmatic hernia - ECMO - extracorporeal life support - extracorporeal membrane oxygenation

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Prof. Agostino Pierro

UCL Institute of Child Health and Great Ormond Street Hospital for Children NHS Trust

30 Guilford Street

London WC1N 1EH

United Kingdom

Email: pierro.sec@ich.ucl.ac.uk