Utility of the oxygenation index in management of congenital diaphragmatic hernia: a report from a Thai University Surgical Centre.

BACKGROUND

Oxygenation index (OI) is associated with severity of newborn pulmonary hypertension (PH) in congenital diaphragmatic hernia (CDH). Higher OI may indicate worst degree(s) of PH.

OBJECTIVES

This study reports OI dynamic(s) over the first 72 h of life and its correlation with (1) perioperative morbidity and (2) CDH mortality.

METHODS

Medical records of inborn CDH babies during 2002-2022 were examined. OI on Days (s) 1-3 and perioperative OI trends were recorded. Operation (primary vs patch repair) and survival rates (%) were studied.

RESULTS

Fifty-five CDH newborns (54.5% male: 45.5% female)-mean birth GA 37.5 ± 2.7 wks. had a mean birth weight 2813 ± 684 g with prenatal diagnosis in 32.7% cases. 52/55 (94.5%) were intubated at birth and HFOV deployed in 29 (55.8%). Those requiring HFOV had higher OI on DOL1 (24.8 ± 17 vs 10.3 ± 11.5; p < 0.05), DOL 2 (26.3 ± 22.9 vs 6.7 ± 12.1; p < 0.05) and DOL 3 (21.9 ± 33.8 vs 5.5 ± 9.3; p = 0.04). Operation was undertaken in 36/55 (65.5%). Preoperative mortality group had significant higher OI on DOL 2 (42.1 ± 21.0 vs 14.9 ± 9.3; p = 0.04). CDH defects were-Type A N = 27 (75%), Type B N = 7 (19.4%) and Type C N = 2 (5.6%). Overall mortality was 40% (22/55). Statistically significant OI trends were recorded in non-survival vs. survival groups on DOL 1 (31.6 ± 16.8. vs 10.5 ± 9.0; p < 0.05, DOL 2 (38.1 ± 21.9 vs 6.3 ± 7.1; p < 0.05), and DOL 3 (38.8 ± 39.4; p = 0.012).

CONCLUSIONS

OI dynamics are highly predictive for accurate monitoring of CDH cardiorespiratory physiology and crucially may guide ventilatory management as well as timing of surgery.