Liver position in fetal congenital diaphragmatic hernia retains a prognostic value in the era of lung-protective strategy

Abstract 

Background/Purpose

The aims of this study were to analyze the outcomes of fetuses with congenital diaphragmatic hernia (CDH) treated by a lung-protective strategy using high-frequency oscillatory ventilation (HFOV) in a single center with a perinatology service and extracorporeal membrane oxygenation (ECMO) capability and to define the natural history of CDH in the era of lung-protective ventilation.

Methods

A retrospective chart review of 30 neonates with CDH seen between April 2002 and October 2004 was conducted. All fetuses with a prenatal diagnosis were evaluated by fetal magnetic resonance imaging to define the liver position, and those with a significant volume of the liver in the chest were regarded as liver-up. Patients were managed by a lung-protective strategy using pressure-limited (maximum mean airway pressure [MAP], 18 cm H₂O) HFOV. The patients were initially placed on HFOV with a fraction of inspired oxygen (Fio₂) of 1.0 and a MAP of 12 cm H₂O. Hypercapnea and preductal saturation as low as 85% were accepted. Inhaled nitric oxide and ECMO were introduced when the baby could not be oxygenated with a MAP of 18 cm H₂O.

Results

Twenty-six neonates (22 inborns with prenatal diagnosis and 4 outborns) were treated with this protocol. Four cases were not treated or died in utero because of severe associated anomalies. Thirteen of the 14 liver-down cases survived without ECMO and were discharged home (93% survival). On the contrary, 4 of 12 liver-up cases survived (33% survival). ECMO was required for initial stabilization in 5 cases with 1 survivor.

Conclusions

Liver-down CDH babies have a good chance for survival without ECMO by a planned delivery and the lung-protective strategy using HFOV. Liver herniation demonstrated by prenatal magnetic resonance imaging retains a poor prognostic value even with this approach.