The aim of the study was to analyze and identify risk factors for the development of moderate and severe bronchopulmonary dysplasia, retinopathy of prematurity, necrotizing enterocolitis in preterm neonates in intensive care unit and during any kind of respiratory support.
Materials and methods: A simple retrospective-prospective blind controlled non-randomised study included 28-32 weeks of gestational age 122 newborns with respiratory distress syndrom, who were treated in the neonatal intensive care units of two medical institutions of Dnipro from 2016 to 2020. Among 122 children neonates were divided into two groups according to particularities of respiratory support, prior type of noinvasive ventilation and infusion volume per day. The uni-variate Cox regressions using clinical variables identified specific clinical variables associated with development of moderate and severe BPD, retinopathy of prematurity, necrotizing enterocolitis, mortality rate (based on odds ratio and 95% confidence interval (95% CI). Then, significant clinical variables were used to build a multivariate Cox regression models. by backwards elimination of non-significant clinical variables. To estimate discriminative ability of comorbidities predictors we conducted ROC-analysis.
Results: The patients with moderate and severe BPD significantly longer were mechanically ventilated and received О2 more than 30% in inhaled gas mixture, therefore every day of MV and/or additional oxygen >30% led to increase in probability of BPD development by 15% (p=0,01), АUC=0,78 (95% CI 0,66-0,89). Significant predictors of moderate and severe retinopathy of prematurity were body weight (AUC 0,64 (95% CI 0,51-0,77) (p=0.03), duration of non-invasive ventilation by NIV PC (AUC 0,68 (95% CI 0,54-0,83) (p <0.01), CPAP (AUC 0.63) (95% CI 0.49-0.76) (p = 0,04) and caffeine administration (AUC 0,68 (95% CI 0,59-0,77) (p=0.01). Patients who developed NEC had a statistically significantly lower daily infusion volume AUC 0,68 (0,59-0,77) p <0.01, later onset of enteral nutrition AUC 0,68 (95% CI 0,59-0,77) p <0.01, lower hemoglobin levels on the first, third and seventh days of life AUC 0,67 (95% CI 0,57-0,77) p <0.01, as well as the level of leukocytes AUC 0,65 (95% CI 0,56-0,75) p = 0,01 and platelet count AUC 0,67 (0,58-0,77) (p <0.01) during the first 7 days of life.
Conclusions: The results of the study revealed risk factors for intensive care in general and respiratory support in particular, which significantly increase the risk of developing comorbidities of prematurity. Among them are relatively controlled, it is the duration of mechanical ventilation and NIV, which increase the risk of BPD and retinopathy of prematurity. Other risk factors which we can manage include nutrition state, anemia and supplemental oxygen.
INVESTIGATION OF T-REGULATORY CELLS IN PREMATURY INFANTS
