At 34 weeks, the brain weight of preterm infants is only 65% that of term infants, and the cortex volume is 53% that of term infants. Damage at this stage of development will also change the trajectory of specific processes in the development of neurons and glial cells, resulting in neurological dysfunction in survivors.The incidence of cerebral palsy in late preterm infants is three times higher than in term infants, and about 25% lag behind term infants in learning, language and other neurodevelopment. At 34-37 weeks of gestation, oligodendrocytes are still late oligodendrocyte precursors and vascular development of the white matter area is immature, making the brain more prone to white matter injury (WMI).
1.1Patients Late preterm infants who were hospitalized in Shengjing Hospital from 1st January 2009 to 31st December 2022. Risk factors prompting MRI evaluation included: (1) premature rupture of fetal membrane, intrauterine distress or placental abruption before delivery; (2) asphyxia, resuscitation and rescue history, circulatory dysfunction and infection during or after delivery; and (3) early convulsions. 1.2 Assessment of brain injury MRI scans were analyzed by a radiologist and a newborn pediatrician who were unfamiliar with the clinical history. WMI diagnosis was carried out as described by reference, with some improvements. 1.3 Collection of clinical data Data, including delivery by cesarean section, gestational hypertension, diabetes mellitus, premature rupture of membranes and placental abruption, were collected for the mothers. Gestational age, weight, gender, whether small for gestational age, Apgar score, resuscitation history, circulatory disorders, early-onset sepsis, convulsions, and MRI data were collected for the newborns. History of resuscitation and rescue refers to positive pressure ventilation, tracheal intubation, chest compression or epinephrine application during labor; circulatory disorders include at least two of the following indicators: prolonged capillary filling time, hypotension, oliguria, increased heart rate and increased liver. 1.4 Instrumentation MRI of the head was performed using an Intera Achieva 3.0T MRI system (Philips, Best, Netherlands). All infants were scanned by conventional MRI and diffusion-weighted imaging (DWI). Because of the retrospective study design, there are differences in imaging schemes, sequences and parameters measured.
Study Type
OBSERVATIONAL
Enrollment
3,000
Shengjing Hospital of China Medical University
Shenyang, Liaoning, China
RECRUITINGImaging evaluation of different types of white matter injury in late preterm infants
The number of participants of white matter injury in late preterm infants, number of late preterm infants with different degrees (mild, moderate, severe) white matter injury and the imaging and pathological characteristics of early white matter injury (within 2 weeks after birth) using T1WI,T2WI,DWI,SWI.
Time frame: 2009.1-2022.12
Imaging differentiation of hemorrhagic and non hemorrhagic injuries
Using magnetic resonance technology, especially magnetic sensitivity, to identify and classify the cases of white matter injury in late preterm infants with or without hemorrhagic injury
Time frame: 2009.1-2022.12
Number of late preterm infants and distribution of gray matter injury in late preterm infants with white matter injury
Using magnetic resonance technology, To determine the number of gray matter injuries (cortex, thalamus, basal ganglia, brainstem) in late preterm infants with white matter injury
Time frame: 2009.1-2022.12
The number and distribution of PVL like injury in white matter injury of late preterm infants
Using magnetic resonance technology, to determine the probability of PVL-like injury in white matter injury of late preterm infants and which type and location are more prone to PVL-like outcomes
Time frame: 2009.1-2022.12
Record of gestational age
To identify the high risk factors of brain white matter injury in late preterm infants，gestational age(weeks) of every late preterm infant will be recorded
Time frame: 2009.1-2022.12
Record of weight
To identify the high risk factors of brain white matter injury in late preterm infants，weight(g) of every late preterm infant will be recorded
Time frame: 2009.1-2022.12
Record of gender
To identify the high risk factors of brain white matter injury in late preterm infants， gender(male/female) of every late preterm infant will be recorded
Time frame: 2009.1-2022.12
Record of small for gestational age
To identify the high risk factors of brain white matter injury in late preterm infants，whether small for gestational age(yes/no) of every late preterm infant will be recorded
Time frame: 2009.1-2022.12
Record of apgar score
To identify the high risk factors of brain white matter injury in late preterm infants，Apgar score(1-10) of every late preterm infant will be recorded
Time frame: 2009.1-2022.12
Number of resuscitation history
To identify the high risk factors of brain white matter injury in late preterm infants，resuscitation history(yes/no) of every late preterm infant will be recorded.History of resuscitation and rescue refers to positive pressure ventilation, tracheal intubation, chest compression or epinephrine application during labor
Time frame: 2009.1-2022.12
Number of circulatory disorders
To identify the high risk factors of brain white matter injury in late preterm infants，circulatory disorders(yes/no) of every late preterm infant will be recorded.Circulatory disorders include at least two of the following indicators: prolonged capillary filling time, hypotension, oliguria, increased heart rate and increased liver.
Time frame: 2009.1-2022.12
Number of early-onset sepsis
To identify the high risk factors of brain white matter injury in late preterm infants，early-onset sepsis(yes/no) of every late preterm infant will be recorded
Time frame: 2009.1-2022.12
Number of convulsions
To identify the high risk factors of brain white matter injury in late preterm infants，convulsions(yes/no) of every late preterm infant will be recorded
Time frame: 2009.1-2022.12
Record of delivery by cesarean section
To identify the high risk factors of brain white matter injury in late preterm infants，delivery by cesarean section(yes/no) of every mother will be recorded
Time frame: 2009.1-2022.12
Number of gestational hypertension
To identify the high risk factors of brain white matter injury in late preterm infants，gestational hypertension(mmHg) of every mother will be recorded
Time frame: 2009.1-2022.12
Number of diabetes mellitus
To identify the high risk factors of brain white matter injury in late preterm infants，diabetes mellitus(yes/no) of every mother will be recorded
Time frame: 2009.1-2022.12
Number of premature rupture of membranes
To identify the high risk factors of brain white matter injury in late preterm infants，premature rupture of membranes(yes/no) of every mother will be recorded
Time frame: 2009.1-2022.12
Number of placental abruption
To identify the high risk factors of brain white matter injury in late preterm infants，placental abruption(yes/no) of every mother will be recorded
Time frame: 2009.1-2022.12
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