4 research outputs found
Supplementary Material for: Second- to Third-Trimester Longitudinal Growth Assessment for the Prediction of Largeness for Gestational Age and Macrosomia in an Unselected Population
<p><b><i>Background:</i></b> Prenatal detection of excessive growth
remains inaccurate. Most strategies rely on a single cross-sectional
evaluation of fetal size during the third trimester. <b><i>Objectives:</i></b>
To compare second- to third-trimester longitudinal growth assessment
with cross-sectional evaluation at the third trimester in the prediction
of largeness for gestational age (LGA) and macrosomia. <b><i>Methods:</i></b>
A cohort of 2,696 unselected singleton pregnancies scanned at 21 ± 2
and 32 ± 2 weeks was created. Abdominal circumference (AC) measurements
were transformed to <i>z</i> values according to the INTERGROWTH-21st standards. Longitudinal growth assessment was performed by calculation of <i>z</i>
velocity and conditional growth. Both methods were compared to
cross-sectional assessment at 32 ± 2 weeks. Predictive performance for
LGA and macrosomia was determined by receiver operating characteristic
curve analysis. <b><i>Result:</i></b> A total of 188 (7%) newborns qualified for LGA and 182 (6.8%) for macrosomia. The areas under the curve (AUCs) for 32-week AC <i>z</i> score, AC <i>z</i>
velocity, and conditional AC were 0.78, 0.61, and 0.55, respectively,
for the prediction of LGA, and 0.75, 0.61, and 0.55, respectively, for
the prediction of macrosomia. Both AUCs of AC <i>z</i> velocity and conditional AC were significantly lower (<i>p</i> < 0.001) than the AUC of cross-sectional AC <i>z</i> scores. <b><i>Conclusions:</i></b>
In the general population, second- to third-trimester longitudinal
assessment of fetal growth is inferior to third-trimester
cross-sectional evaluation of size in the prediction of LGA and
macrosomia.</p
Supplementary Material for: Gender-Specific Antenatal Growth Reference Charts in Monochorionic Twins
<b><i>Objective:</i></b> To create antenatal gender-specific reference growth charts in uncomplicated monochorionic diamniotic twins. <b><i>Materials and Methods:</i></b> This is a prospective longitudinal study in which uncomplicated monochorionic (MC) twin pregnancies were included from 23 + 4 weeks of gestation onwards. Estimated fetal weight (EFW) and biometric parameters (biparietal diameter, head circumference, abdominal circumference, and femur length) were evaluated in both fetuses every 2 weeks using standardized methodology. Maternal and fetal complications were excluded. Charts were fitted for each biometric parameter and EFW in relation to gestational age and fetal gender using multilevel mixed models. <b><i>Results:</i></b> The final analysis included a total of 456 ultrasound examinations in 62 MC twins, with a mean of 7 scans per pregnancy (range 5–8). The mean as well as 5th and 95th percentiles of each biometric parameter and EFW were adjusted in relation to gender and gestational age between 24 and 37 weeks of gestation. Male fetuses have higher reference values than females, and the disparity is larger in the upper centiles of the distribution. <b><i>Discussion:</i></b> We provide gender-specific reference growth charts for MC twins. We suggest that these charts will improve prenatal MC twin assessment and surveillance, with a more accurate classification of normal or growth-restricted fetuses adjusted per sex
Supplementary Material for: Neurodevelopmental Effects of Undernutrition and Placental Underperfusion in Fetal Growth Restriction Rabbit Models
<p><b><i>Introduction:</i></b> Chronic reduction of oxygen and nutrient
delivery to the fetus has been related to neurodevelopmental problems.
Placental underperfusion induces a significant reduction in oxygen and
nutrient delivery, whereas maternal undernutrition causes mainly
nutrient deficiency. A comparison of the neurodevelopmental effects of
both situations in pregnant rabbits was performed. <b><i>Materials and Methods:</i></b>
The placental underperfusion model was induced after uteroplacental
vessel ligation at 25 days of pregnancy. The undernutrition model was
induced after a reduction of 70% of the basal maternal intake at 22 days
of pregnancy. Neurobehavioral tests were applied in the derived
offspring at the neonatal period and over the long term. Structural
brain differences were evaluated by brain networks obtained from
diffusion magnetic resonance imaging. <b><i>Results:</i></b> Birth
weight was significantly lower in both cases. However, stillbirth was
only increased in the placental underperfusion model. Cases from both
models presented poorer neurobehavioral performance and network
infrastructure, being more pronounced in the placental underperfusion
model. <b><i>Discussion:</i></b> Prenatal insults during the last third
of gestation resulted in functional and structural disturbances. The
degree of neurodevelopmental impairment and its association with
structural brain reorganization seemed to be related to the type of the
prenatal insult, showing stronger effects in the placental
underperfusion model.</p
Supplementary Material for: Early Environmental Enrichment Enhances Abnormal Brain Connectivity in a Rabbit Model of Intrauterine Growth Restriction
<p><b><i>Introduction:</i></b> The structural correspondence of
neurodevelopmental impairments related to intrauterine growth
restriction (IUGR) that persists later in life remains elusive.
Moreover, early postnatal stimulation strategies have been proposed to
mitigate these effects. Long-term brain connectivity abnormalities in an
IUGR rabbit model and the effects of early postnatal environmental
enrichment (EE) were explored. <b><i>Materials and Methods:</i></b> IUGR
was surgically induced in one horn, whereas the contralateral one
produced the controls. Postnatally, a subgroup of IUGR animals was
housed in an enriched environment. Functional assessment was performed
at the neonatal and long-term periods. At the long-term period,
structural brain connectivity was evaluated by means of
diffusion-weighted brain magnetic resonance imaging and by histological
assessment focused on the hippocampus. <b><i>Results:</i></b> IUGR
animals displayed poorer functional results and presented altered
whole-brain networks and decreased median fractional anisotropy in the
hippocampus. Reduced density of dendritic spines and perineuronal nets
from hippocampal neurons were also observed. Of note, IUGR animals
exposed to enriched environment presented an improvement in terms of
both function and structure. <b><i>Conclusions:</i></b> IUGR is
associated with altered brain connectivity at the global and cellular
level. A strategy based on early EE has the potential to restore the
neurodevelopmental consequences of IUGR.</p