Correlation between US and MRI for prenatal lung volumetry in diaphragmatic hernia, and use of Doppler to identify the ipsilateral lung cap

Follow-up of fetuses with congenital diaphragmatic hernia: The quantitative lung index

OBJECTIVE

To assess the longitudinal behavior of Quantitative Lung Index (QLI) for the follow-up of fetuses with congenital diaphragmatic hernia.

STUDY DESIGN

Retrospective study of fetuses with isolated left congenital diaphragmatic hernia. The fetuses were assessed by ultrasound at different gestational ages and QLI was retrospectively calculated by means of previous lung-to-head ratio measurements. We used a random effects model (mixed model with repeated measurements) to compare the performance of the QLI in operated and non-operated fetuses throughout pregnancy.

RESULTS

Fifty-eight cases of isolated left diaphragmatic hernia with complete follow-up were assessed in Hospital Universitari Vall d'Hebron in Barcelona (2003-2015). Thirty-eight of them were managed expectantly (non-TO) and the other 20 underwent tracheal occlusion (TO). All fetuses undergoing tracheal occlusion had lung-to-head ratio (LHR) <1, observed-to-expected LHR (o/eLHR) ≤45%, QLI <0.6 and liver up inside the thorax. The survival rate was 87% for the non-TO group and 60% for the TO group (p = 0.02). The QLI remained constant throughout pregnancy in both groups. The QLI in the TO group had lower values than the non-TO group (p < 0.03).

CONCLUSION

The quantitative lung index was constant during pregnancy. This index was lower in fetuses undergoing tracheal occlusion but no significant changes were seen in its performance during pregnancy.