Retrospective Observational Study of the Frequency and Interrelationships Among Neonatal Near Miss Criteria.

Objective: To evaluate the frequency and interrelationships among neonatal near miss (NNM) criteria and the anticipated workload for audits in high-income countries.

Design: Observational retrospective descriptive study.

Setting: Tertiary maternal and neonatal units at Mater Mothers' Hospital, Brisbane, Queensland, Australia.

Participants: Cases of stillbirths (n = 483), neonatal deaths (n = 203), and live births (n = 66,353) from January 2016 to July 2022 (N = 67,039).

Methods: We identified eight prespecified NNM criteria nominated by perinatal experts. Primary outcomes were NNM frequency, their interrelationships, and related workload. We used descriptive statistics and analysis of variance and considered p < .05 significant.

Results: We found 2,243 unique NNM cases (33.7/1,000 live births). The NNM ratio per 1,000 live births according to each of the eight criteria were: unplanned resuscitation at birth (25.09/1,000 live births), birth asphyxia needing surveillance for hypoxic ischemic encephalopathy (8.46/1,000 live births), metabolic acidosis at birth (8.04/1,000 live births), advanced resuscitation at birth (3.68/1,000 live births), seizures and/or stroke (0.96/1,000 live births), severe intraventricular hemorrhage and/or cerebellar hemorrhage (0.95/1,000 live births), moderate to severe hypoxic ischemic encephalopathy (0.9/1,000 live births), and severe birth trauma (0.44/1,000 live births). Almost one third of NNM cases met more than one criterion. Anticipated workload for monthly NNM audits varied from 0.04 to 2.8 cases per 1,000 live births.

Conclusion: Different sets of NNM criteria considerably alter the frequency of NNMs and the anticipated workload for NNM audits. Their interrelationships are likely attributable to the fact that some of the criteria are risk factors for or are part of the causal pathway for other NNM criteria. These findings can assist with the determination of a pragmatic NNM definition considering the feasibility of NNM audits in high-income countries.