Objective To systematically review the effect of adjustable fortification on feeding during preterm hospitalization. Methods We searched Cochrane Library, Web of Science, PubMed, China National Knowledge Infrastructure, Wanfang, Chongqing VIP for clinical controlled trials about adjustable fortification in premature infants. The retrieval time limit was from the establishment of each database to September 2022. We selected studies according to inclusion and exclusion criteria, extracted data and assessed their quality, then used RevMan5.3 for analysis. Results A total of 5 randomized controlled studies, 1 historical controlled study and 3 case-control studies were included, including 750 premature infants. Meta-analysis results showed that compared with the standard fortification group, the differences of body weight growth rate [mean difference (MD)=1.61 g/(kg·d), 95% confidence interval (CI) (0.73, 2.49) g/(kg·d), P=0.0003], body length growth rate [MD=0.15 cm/week, 95%CI (0.01, 0.29) cm/week, P=0.04], head circumference growth rate [MD=0.19 cm/week, 95%CI (0.06, 0.31) cm/week, P=0.003], incidence rate of necrotizing enterocolitis [relative risk (RR)=0.23, 95%CI (0.07, 0.75), P=0.01] were statistically significant in the adjustable fortification group. There was no significant difference in the incidence of feeding intolerance between the two groups [RR=0.58, 95%CI (0.31, 1.11), P=0.10]. Conclusion Adjusted fortification has a positive role in promoting the physical development of premature infants without increasing the incidence of feeding intolerance and necrotizing enterocolitis. When the growth of premature infants is poor after using standard fortification, adjustable fortification can be considered. However, due to the lack of included literature, more large sample, high-quality randomized controlled studies are needed in the future to further verify the feeding effect of adjustable fortification on premature infants.
ObjectiveTo investigate the incidence and risk factors of retinopathy of prematurity (ROP) in extremely preterm infants (EPI) before 28 weeks of gestation during 8-years period.MethodsA retrospective study. From January 1, 2011 to December 31, 2018, 300 EPI infants with a gestational age of less than 28 weeks admitted to the neonatal intensive care unit (NICU) of Tianjin Central Hospital of Gynecology Obstetrics were included in the study. EPI birth gestational week (GA), birth weight (BW), gender and other basic information, as well as neonatal respiratory distress syndrome, oxygen (≥10 d), bronchopulmonary dysplasia (BPD) and other hospitalizations and complications were recorded. According to ROP international classification standards, ROP was staged. Severe ROP was defined as ROP that requires treatment. The screening start time, screening interval, and intervention time of all children tested were carried out in accordance with the requirements of the “Guidelines for Screening Retinopathy of Prematurity” until the end of follow-up. The most severe ROP during the follow-up of each examined child was recorded as the final screening result of the examined child, and those with asymmetric eyes with the screening results of the severe side of the diseas was recorded. A retrospective analysis of the overall incidence of EPI ROP showed the incidence of severe ROP, and the first and second stages of EPI ROP during the 8 years (from January 1, 2011 to December 31, 2014, and January 1, 2015 to December 31, 2018), changes in the rate of severe illness. Logistic regression analysis was used to screen independent risk factors for severe ROP.ResultsAmong 300 EPI infants, the average GA was (26.7±1.8) weeks; the average BW was (993.3±178.7) g. Two hundred and five infants (68.3%) were diagnosed with ROP, 116 (56.6%), 57 (27.8%), and 32 (15.6%) infants of stage Ⅰ, Ⅱ, and Ⅲ disease, respectively. There were no infants of stage IV and V. There were 30 infants (14.6%) with additional lesions and 59 infants (19.7%) with severe ROP requiring treatment. With the increase of GA (χ2=52.391, 44.521; P=0.000, 0.000) and BW (χ2=43.772, 26.138; P=0.000, 0.000), the incidence of EPI ROP and the incidence of severe ROP decreased significantly. From 2011 to 2018, the number of people surviving EPI obviously increased, especially those with small GA (26 weeks) and low BW (750 g). The average GA of the second stage EPI was lower than that of the first stage, the difference was statistically significant (t=2.243, P=0.026); the average BW of the second stage EPI was lower than the first stage, the difference was not statistically significant (t=1.428, P=0.154). The incidence of ROP in the second stage EPI was slightly higher than that in the first stage, and the incidence of severe ROP was lower than that in the first stage, the difference was not statistically significant (χ2=1.069, 1.723; P=0.301, 0.189). Multivariate logistic regression analysis showed that GA＜27 weeks (β=－2.584, P=0.032), maternal chorioamnionitis (CA) (β=－0.935, P=0.038) and BPD (β=－1.432, P=0.001) was an independent risk factor for severe ROP.ConclusionsThe incidence of EPI ROP and severe ROP are 68.3% and 19.7%, respectively. From 2011 to 2018, the number of survivors of EPI obviously increase, and those with small GA and low BW increase significantly; however, the incidence of ROP and severe ROP remaine stable. GA, CA and BPD are independent risk factors for severe ROP.
Objective To investigate the degree of retinal development in preterm infants.MethodsFlash electroretinography (ERG) was performed on 25 healthy preterm infants and 25 full-term ones, and the response of rod cells and cone cells and maximal mixed responses were recorded. The delitescence and amplitudes of a-and b-waves and the ratio of amplitudes of b-/a-wave of maximal responses were analyzed. ResultsCompared with the full-term infants, The delitescence of responses of rod cells in preterm infants was statistically longer（t=11.007，P=0.000）but without any significant changes of amplitudes （t=1.836，P=0.069）; statistically longer delitescence (t=2.44, P=0.010; t=10.800, P=0.000) and lower amplitude (t=5804，P=0.000; t=5.809,P=0.000) of a-and b-wave of maximal response were found in preterm infants group. In the response of cone cells, there were significant differences of the delitescence （t=4.444，P=0.000）and amplitude （t=3.819，P=0.000）of a-wave and delitescence of b-wave（t=2.850，P=0.005） between the two groups, and no statistical difference of amplitude of b-wave （t=0.486，P=0.628） between the two groups. The ratio of amplitudes of b-/a-wave of the maximal mixed response was not significantly different between the two groups （t=1.142，P=0.256）.ConclusionsThe development of retinal function is slower in preterm infants than that in full-term ones.(Chin J Ocul Fundus Dis, 2005,21:285-287)
ObjectiveTo observe the morphologic characteristics of color Doppler flow imaging (CDFI) and blood stream in patients with retinopathy of prematurity, and provide the new clinical diagnostic gist.MethodsCDFI was performed on 78 patients (156 eyes) with ROP at Ⅳ and Ⅴ stage, who had the diseases history such as prematurity and low birthweight which had been diagnosed by indirect ophthalmoscope, underwent the examination of CDFI. Morphologic characteristics of the results of CDFI and features of blood flow of the pathological changes were observed. ResultsIn the patients with ROP at the Ⅳ stage, a weak zonal echo originated from one side of peripheral wall of eye ball in the vitreous body, and extended to the echo of post pole and wall of eye ball and joined the echo of optic disc. In the patients with ROP at the V stage, lumplike echo connected closely with echo of lens and the circumambience was surrounded; the focus looked like lotus when combined with retinal detachment: the swelled “corona” wrapped and tightly connected with the lens, and the thin “caulis” showed weak zonal echo which attached to the optic disc. The features of blood flow showed the signal of blood stream connected with central retinal artery at the “caulis”, which was analyzed by Doppler spectrum as the bloodflow spectrum of artery and vein in the same direction which was the same as the central retinal artery and vein.ConclusionsIn patients with ROP at the IV and V stage, the results of CDFI mainly shows zonal or lumplike echo, in which the bloodflow signal extended with central retinal artery could be seen. The morphological changes of CDFI and the features of blood flow are useful in diagnosis of ROP. (Chin J Ocul Fundus Dis, 2005,21:282-284)