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Journal of Obstetrics and Gynaecology :... Dec 2024Vaginal bleeding during pregnancy has been recognised as a significant risk factor for adverse pregnancy outcomes. This study aimed to investigate the association... (Meta-Analysis)
Meta-Analysis Review
Vaginal bleeding during pregnancy has been recognised as a significant risk factor for adverse pregnancy outcomes. This study aimed to investigate the association between vaginal bleeding during the first trimester of pregnancy and clinical adverse effects using a systematic review and meta-analysis. Databases of Scopus, Web of Science, PubMed (including Medline), Cochrane Library and Science Direct were searched until June of 2023. Data analysis using statistical test fixed- and random-effects models in the meta-analysis, Cochran and meta-regression. The quality of the eligible studies was assessed by using the Newcastle-Ottawa Scale checklist (NOS). A total of 46 relevant studies, with a sample size of 1,554,141 were entered into the meta-analysis. Vaginal bleeding during the first trimester of pregnancy increases the risk of preterm birth (OR: 1.8, CI 95%: 1.6-2.0), low birth weight (LBW; OR: 2.0, CI 95%: 1.5-2.6), premature rupture of membranes (PROMs; OR: 2.3, CI 95%: 1.8-3.0), abortion (OR: 4.3, CI 95%: 2.0-9.0), stillbirth (OR: 2.5, CI 95%: 1.2-5.0), placental abruption (OR: 2.2, CI 95%: 1.4-3.3) and placenta previa (OR: 1.9, CI 95%: 1.5-2.4). Vaginal bleeding in the first trimester of pregnancy is associated with preterm birth, LBW, PROMs, miscarriage, stillbirth, placental abruption and placenta previa. Therefore, physicians or midwives need to be aware of the possibility of these consequences and manage them when they occur.
Topics: Pregnancy; Infant, Newborn; Female; Humans; Stillbirth; Premature Birth; Abruptio Placentae; Placenta Previa; Placenta; Pregnancy Outcome; Abortion, Spontaneous; Uterine Hemorrhage
PubMed: 38305047
DOI: 10.1080/01443615.2023.2288224 -
The Cochrane Database of Systematic... Mar 2016Melatonin is an antioxidant with anti-inflammatory and anti-apoptotic effects. Animal studies have supported a fetal neuroprotective role for melatonin when administered... (Review)
Review
BACKGROUND
Melatonin is an antioxidant with anti-inflammatory and anti-apoptotic effects. Animal studies have supported a fetal neuroprotective role for melatonin when administered maternally. It is important to assess whether melatonin, given to the mother, can reduce the risk of neurosensory disabilities (including cerebral palsy) and death, associated with fetal brain injury, for the preterm or term compromised fetus.
OBJECTIVES
To assess the effects of melatonin when used for neuroprotection of the fetus.
SEARCH METHODS
We searched the Cochrane Pregnancy and Childbirth Group's Trials Register (31 January 2016).
SELECTION CRITERIA
We planned to include randomised controlled trials and quasi-randomised controlled trials comparing melatonin given to women in pregnancy (regardless of the route, timing, dose and duration of administration) for fetal neuroprotection with placebo, no treatment, or with an alternative agent aimed at providing fetal neuroprotection. We also planned to include comparisons of different regimens for administration of melatonin.
DATA COLLECTION AND ANALYSIS
Two review authors planned to independently assess trial eligibility, trial quality and extract the data.
MAIN RESULTS
We found no randomised trials for inclusion in this review. One study is ongoing.
AUTHORS' CONCLUSIONS
As we did not identify any randomised trials for inclusion in this review, we are unable to comment on implications for practice at this stage.Although evidence from animals studies has supported a fetal neuroprotective role for melatonin when administered to the mother during pregnancy, no trials assessing melatonin for fetal neuroprotection in pregnant women have been completed to date. However, there is currently one ongoing randomised controlled trial (with an estimated enrolment target of 60 pregnant women) which examines the dose of melatonin, administered to women at risk of imminent very preterm birth (less than 28 weeks' gestation) required to reduce brain damage in the white matter of the babies that were born very preterm.Further high-quality research is needed and research efforts should directed towards trials comparing melatonin with either no intervention (no treatment or placebo), or with alternative agents aimed at providing fetal neuroprotection (such as magnesium sulphate for the very preterm infant). Such trials should evaluate maternal and infant short- and longer-term outcomes (including neurosensory disabilities such as cerebral palsy), and consider the costs of care.
Topics: Female; Fetus; Humans; Melatonin; Neuroprotection; Neuroprotective Agents; Pregnancy
PubMed: 27022888
DOI: 10.1002/14651858.CD010527.pub2 -
The Cochrane Database of Systematic... Oct 2014One to eight per cent of women suffer third-degree perineal tear (anal sphincter injury) and fourth-degree perineal tear (rectal mucosa injury) during vaginal birth, and... (Review)
Review
BACKGROUND
One to eight per cent of women suffer third-degree perineal tear (anal sphincter injury) and fourth-degree perineal tear (rectal mucosa injury) during vaginal birth, and these tears are more common after forceps delivery (28%) and midline episiotomies. Third- and fourth-degree tears can become contaminated with bacteria from the rectum and this significantly increases in the chance of perineal wound infection. Prophylactic antibiotics might have a role in preventing this infection.
OBJECTIVES
To assess the effectiveness of antibiotic prophylaxis for reducing maternal morbidity and side effects in third- and fourth-degree perineal tear during vaginal birth.
SEARCH METHODS
We searched the Cochrane Pregnancy and Childbirth Group's Trials Register (31 August 2014) and the reference lists of retrieved articles.
SELECTION CRITERIA
Randomised controlled trials comparing outcomes of prophylactic antibiotics versus placebo or no antibiotics in third- and fourth-degree perineal tear during vaginal birth.
DATA COLLECTION AND ANALYSIS
Two review authors independently assessed the trial reports for inclusion and risk of bias, extracted data and checked them for accuracy.
MAIN RESULTS
We identified and included one trial (147 women from a pre-planned sample size of 310 women) that compared the effect of prophylactic antibiotic (single-dose, second-generation cephalosporin - cefotetan or cefoxitin, 1 g intravenously) on postpartum perineal wound complications in third- or fourth-degree perineal tears compared with placebo. Perineal wound complications (wound disruption and purulent discharge) at the two-week postpartum check up were 8.20% and 24.10% in the treatment and the control groups respectively (risk ratio (RR) 0.34, 95% confidence interval (CI) 0.12 to 0.96). However, the high failed-appointment rate may limit the generalisability of the results. The overall risk of bias was low except for incomplete outcome data. The quality of the evidence using GRADE was moderate for infection rate at two weeks' postpartum, and low for infection rate at six weeks' postpartum.
AUTHORS' CONCLUSIONS
Although the data suggest that prophylactic antibiotics help to prevent perineal wound complications following third- or fourth-degree perineal tear, loss to follow-up was very high. The results should be interpreted with caution as they are based on one small trial.
Topics: Anal Canal; Anti-Bacterial Agents; Antibiotic Prophylaxis; Cefotetan; Cefoxitin; Cephalosporins; Delivery, Obstetric; Female; Humans; Intestinal Mucosa; Perineum; Pregnancy; Randomized Controlled Trials as Topic; Rectum; Rupture; Wound Infection
PubMed: 25289960
DOI: 10.1002/14651858.CD005125.pub4 -
Human Reproduction Open 2019What is the effect of endometrial scratching in patients with or without prior failed ART cycles on live birth (LBR) and clinical pregnancy rates (CPR)? (Review)
Review
STUDY QUESTION
What is the effect of endometrial scratching in patients with or without prior failed ART cycles on live birth (LBR) and clinical pregnancy rates (CPR)?
SUMMARY ANSWER
It remains unclear if endometrial scratching improves the chance of pregnancy and, if so, for whom.
WHAT IS KNOWN ALREADY
Endometrial scratching is hypothesized to improve embryo implantation in ART. Multiple studies have been published, but it remains unclear if endometrial scratching actually improves pregnancy rates and, if so, for which patients.
STUDY DESIGN SIZE DURATION
For this review, a systematic search for published articles on endometrial scratching and ART was performed on 12 February 2018, in Pubmed, Embase and the Cochrane Library.
PARTICIPANTS/MATERIALS SETTING METHODS
Randomized controlled trials (RCTs) that evaluated endometrial scratching in the cycle prior to the stimulation cycle and reported CPR or LBR were included. RCTs investigating the effect of scratching during the stimulation cycle, or prior to cryo-thaw cycles were excluded. Studies were assessed using the Cochrane Risk of Bias tool. The effect of scratching was assessed for three different patient groups: patients with no prior IVF/ICSI treatment (Group 0), patients with one failed full IVF/ICSI cycle, including cryo-thaw cycles (Group 1) and patients with two or more failed full IVF/ICSI cycles (Group 2). A meta-analysis was performed when statistical heterogeneity was low; otherwise, a descriptive analysis was performed.
MAIN RESULTS AND THE ROLE OF CHANCE
Fourteen RCTs involving 2537 participants were included. Most RCTs contained a high or unclear risk of bias on one or more items. Substantial clinical and statistical heterogeneity was present; therefore meta-analysis for LBR and CPR could only be performed on Group 1. For this group, no differences between scratch and control were found for both LBR (risk ratio (RR) 1.01 [95%CI 0.68-1.51]) and CPR (RR 1.04 [95%CI 0.74-1.45]). For Groups 0 and 2, pooled analysis could not be performed, and for both groups the results of the individual RCTs were negative, neutral and positive. Miscarriage and multiple pregnancy rates were evaluated for the three groups (0, 1 and 2) together. Both outcomes were not significantly different between scratch and control (miscarriage rate RR 0.82 [95%CI 0.57-1.17] and multiple pregnancy rate RR 1.06 [95%CI 0.84-1.35]). Subgroup analysis, excluding trials with a risk of unintentional endometrial injury in the control group, was performed for Group 0 and 2 for LBR and CPR, and for the overall groups for miscarriage rate and multiple pregnancy rate. This reduced the heterogeneity and allowed for pooled analysis in these subgroups. Results of pooled analysis for the subgroups of Group 0 and 2 showed no significant difference for LBR, but CPR was significantly improved after endometrial scratching (Group 0 RR 1.28 [95%CI 1.02-1.62] and Group 2 RR 2.03 [95%CI 1.20-3.43]). Subgroup analysis of the overall groups showed no significant difference for miscarriage and multiple pregnancy rate.
LIMITATIONS REASONS FOR CAUTION
The main limitations were that many RCTs had a high or unclear risk of bias on one or several items, clinical heterogeneity was still present despite categorizing into three populations, and that not all RCTs could be included in the analyses because separate data for our three groups could not be provided.
WIDER IMPLICATIONS OF THE FINDINGS
It remains unclear if endometrial scratching improves the chance of pregnancy for women undergoing ART and, if so, for whom. This means endometrial scratching should not be offered in daily practice until results from large and well-designed RCTs and an individual patient data analysis become available.
STUDY FUNDING/COMPETING INTERESTS
No specific funding was sought for the study. The Department of Reproductive Medicine and Gynaecology funds of the University Medical Center of Utrecht were used to support the authors throughout the study period and preparation of the manuscript. None of the authors has a conflict of interest to declare.
REGISTRATION NUMBER
Not applicable.
PubMed: 30895265
DOI: 10.1093/hropen/hoy025 -
Midwifery Nov 2022Maternity health professionals (MHPs) caring for women may witness or be involved in traumatic births. This can be associated with MHPs experiencing secondary traumatic... (Review)
Review
OBJECTIVES
Maternity health professionals (MHPs) caring for women may witness or be involved in traumatic births. This can be associated with MHPs experiencing secondary traumatic stress (STS) or probable post-traumatic stress disorder (PTSD), which may impact MHPs emotionally and physically. The aims of this review were therefore to determine: (i) the prevalence of STS and PTSD in maternity health professionals; and (ii) the impact of witnessing birth trauma on maternity health professionals.
METHODS
A mixed-methods systematic review was carried out by conducting literature searches on CINAHL, MEDLINE, PsychARTICLES, PsychINFO and PsychTESTS databases. Searches were conducted from the inception of databases up to February 2022 using search terms on MHPs and birth trauma combined. Methodological quality and bias were assessed. Data were synthesised using thematic synthesis.
RESULTS
A total of 18 studies were included in the review. Sample size ranged from 9 to 2,165 (total N = 8,630). Participants included midwives, nurses and obstetricians aged 18-77 years. Many MHPs had witnessed a traumatic birth event (45% - 96.9%) with the prevalence of STS ranging from 12.6%-38.7% and the proportion of participants meeting diagnostic criteria for PTSD ranging from 3.1%-46%. MHPs reported positive and negative effects associated with witnessing traumatic birth events. Synthesis of quantitative and qualitative papers identified five themes: Negative emotions and symptoms; Responsibility and regret; Impact on practice and care; Challenging professional identity; and Team support being essential.
DISCUSSION
Witnessing traumatic birth events is associated with profound emotional and physical impacts on MHPs, signifying the importance of acknowledging and addressing this in the maternity workforce. It is important to raise awareness of the impact of birth trauma on MHPs. Effective education and training guidelines, a supervisory network, ways to change practice and policy, and support and treatment should be provided to assist and improve the outcomes and work-life of MHPs' who witness traumatic births.
Topics: Humans; Female; Pregnancy; Parturition; Midwifery; Nurse Midwives; Stress Disorders, Post-Traumatic; Birth Injuries
PubMed: 36058189
DOI: 10.1016/j.midw.2022.103460 -
The Cochrane Database of Systematic... Nov 2022Follicular aspiration under transvaginal ultrasound guidance is routinely performed as part of assisted reproductive technology (ART) to retrieve oocytes for in vitro... (Review)
Review
BACKGROUND
Follicular aspiration under transvaginal ultrasound guidance is routinely performed as part of assisted reproductive technology (ART) to retrieve oocytes for in vitro fertilisation (IVF). The process involves aspiration of the follicular fluid followed by the introduction of flush, typically culture media, back into the follicle followed by re-aspiration. However, there is a degree of controversy as to whether this intervention yields a larger number of oocytes and is hence associated with greater potential for pregnancy than aspiration only.
OBJECTIVES
To assess the safety and efficacy of follicular flushing as compared with aspiration only performed in women undergoing ART.
SEARCH METHODS
We searched the following electronic databases up to 13 July 2021: the Cochrane Gynaecology and Fertility Specialised Register of Controlled Trials, CENTRAL (containing output from two trial registries and CINAHL), MEDLINE, Embase, and PsycINFO. We also searched LILACS, Google Scholar, and Epistemonikos. We reviewed the reference lists of relevant papers and contacted experts in the field to identify further relevant studies.
SELECTION CRITERIA
We included randomised controlled trials (RCTs) that compared follicular aspiration and flushing with aspiration alone in women undergoing ART using their own gametes. Primary outcomes were live birth rate and miscarriage rate per woman randomised.
DATA COLLECTION AND ANALYSIS
Two review authors independently assessed studies identified by search against the inclusion criteria, extracted data, and assessed risk of bias. A third review author was consulted if required. We contacted study authors as needed. We analysed dichotomous outcomes using Mantel-Haenszel odds ratios (ORs), 95% confidence intervals (CIs), and a fixed-effect model, and we analysed continuous outcomes using mean differences (MDs) between groups presented with 95% CIs. We examined the heterogeneity of studies via the I statistic. We assessed the certainty of evidence using the GRADE approach.
MAIN RESULTS
We included 15 studies with a total of 1643 women. Fourteen studies reported outcomes per woman randomised, and one study reported outcomes per ovary. No studies were at low risk of bias across all domains; the main limitation was lack of blinding. The certainty of the evidence ranged from moderate to very low, and was downgraded for risk of bias, imprecision, and inconsistency. We are uncertain of the effect of follicular flushing on live birth rate compared to aspiration alone (OR 0.93, 95% CI 0.59 to 1.46; 4 RCTs; n = 467; I = 0%; moderate-certainty evidence). This suggests that with a live birth rate of approximately 30% with aspiration alone, the equivalent live birth rate with follicular flushing lies between 20% and 39%. We are uncertain of the effect of follicular flushing on miscarriage rate compared to aspiration alone (OR 1.98, 95% CI 0.18 to 22.22; 1 RCT; n = 164; low-certainty evidence). This suggests that with a miscarriage rate of approximately 1% with aspiration alone, the equivalent miscarriage rate with follicular flushing lies between 0% and 22%. We are uncertain of the effect of follicular flushing on oocyte yield (MD -0.47 oocytes, 95% CI -0.72 to -0.22; 9 RCTs; n = 1239; I = 61%; very low-certainty evidence); total number of embryos (MD -0.10 embryos, 95% CI -0.34 to 0.15; 2 RCTs; n = 160; I = 58%; low-certainty evidence); and clinical pregnancy rate (OR 1.12, 95% CI 0.85 to 1.51; 7 RCTs; n = 939; I = 46%; low-certainty evidence). The duration of the retrieval process may be longer with flushing (MD 175.44 seconds, 95% CI 152.57 to 198.30; 7 RCTs; n = 785; I = 87%; low-certainty evidence). It was not possible to perform a meta-analysis for adverse events, although individual studies reported on outcomes ranging from depression and anxiety to pain and pelvic organ injury.
AUTHORS' CONCLUSIONS
The effect of follicular flushing on both live birth and miscarriage rates compared with aspiration alone is uncertain. Although the evidence does not permit any firm conclusions on the impact of follicular flushing on oocyte yield, total number of embryos, number of cryopreserved embryos, or clinical pregnancy rate, it may be that the procedure itself takes longer than aspiration alone. The evidence was insufficient to permit any firm conclusions with respect to adverse events or safety.
Topics: Pregnancy; Female; Humans; Oocyte Retrieval; Abortion, Spontaneous; Reproductive Techniques, Assisted; Pregnancy Rate; Fertilization in Vitro
PubMed: 36409927
DOI: 10.1002/14651858.CD004634.pub4 -
Journal of Neonatal-perinatal Medicine 2022Perinatal stroke is one of the principal causes of cerebral palsy (CP) in preterm infants. Stroke in preterm infants is different from stroke in term infants, given the...
BACKGROUND
Perinatal stroke is one of the principal causes of cerebral palsy (CP) in preterm infants. Stroke in preterm infants is different from stroke in term infants, given the differences in brain maturation and the mechanisms of injury exclusive to the immature brain. We conducted a systematic review to explore the epidemiology and pathogenesis of periventricular hemorrhagic infarction (PVHI), perinatal arterial ischemic stroke (PAIS) and cerebral sinovenous thrombosis (CSVT) in preterm infants.
METHODS
Studies were identified based on predefined study criteria from MEDLINE, EMBASE, SCOPUS and WEB OF SCIENCE electronic databases from 2000 -2019. Results were combined using descriptive statistics.
RESULTS
Fourteen studies encompassed 546 stroke cases in preterm infants between 23 -36 weeks gestational ages and birth weights between 450 -3500 grams. Eighty percent (436/546) of the stroke cases were PVHI, 17%(93/546) were PAIS and 3%(17/546) were CSVT. Parietal PVHI was more common than temporal and frontal lobe PVHI. For PAIS, left middle cerebral artery (MCA) was more common than right MCA or cerebellar stroke. For CSVT partial or complete thrombosis in the transverse sinus was universal. All cases included multiple possible risk factors, but the data were discordant precluding aggregation within a meta-analysis.
CONCLUSION
This systematic review confirms paucity of data regarding the etiology and the precise causal pathway of stroke in preterm infants. Moreover, the preterm infants unlike the term infants do not typically present with seizures. Hence high index of clinical suspicion and routine cUS will assist in the timely diagnosis and understanding of stroke in this population.
Topics: Brain; Cerebral Palsy; Female; Gestational Age; Humans; Infant; Infant, Newborn; Infant, Premature; Pregnancy; Stroke
PubMed: 34219672
DOI: 10.3233/NPM-200597 -
Acta Obstetricia Et Gynecologica... Feb 2021Pregnant women with a body mass index (BMI) ≥40 kg/m are at an increased risk of requiring planned- and unplanned cesarean deliveries (CD). The aim of this systematic... (Meta-Analysis)
Meta-Analysis
INTRODUCTION
Pregnant women with a body mass index (BMI) ≥40 kg/m are at an increased risk of requiring planned- and unplanned cesarean deliveries (CD). The aim of this systematic review is to compare outcomes in women with BMI ≥ 40 kg/m based on planned and actual mode of birth.
MATERIAL AND METHODS
Five databases were searched for English and French-language publications until February 2019, and all studies reporting on delivery outcomes in women with BMI ≥ 40 kg/m , stratified by planned and actual mode of birth, were included. Risk-of-bias was assessed using the Newcastle-Ottawa Scale. Relative risks (RR) and 95% confidence intervals were calculated using random-effects meta-analysis.
RESULTS
Ten observational studies were included. Anticipated vaginal birth vs planned CD (5 studies, n = 2216) was associated with higher risk for postpartum hemorrhage (13.0% vs 4.1%, P < .001, numbers needed to harm (NNH = 11), I = 0%) but lower risk for wound complications (7.6% vs 14.5%, P < .001, numbers needed to treat (NNT = 15), I = 58.3%). Planned trial of labor vs repeat CD (3 studies, n = 4144) was associated with higher risk for uterine dehiscence (0.94% vs 0.42%, P = .04, NNH = 200, I = 0%), endometritis (5.1% vs 2.2%, P < .001, NNH = 35, I = 0%), prolonged hospitalization (one study, 30.3% vs 26.0%, P = .003, NNH = 23), low five-minute Apgar scores (4.9% vs 1.7%, RR 2.95 (2.03, 4.28), NNH = 30, I = 0%) and birth trauma (1.1% vs 0.2%, P < .001, NNH = 111, I = 0%). Successful vaginal birth vs intrapartum CD (n = 3625) was associated with lower risk of postpartum hemorrhage (15.1% vs 70%, P < .001, NNT = 2, I = 0%), wound complications (one study, 0% vs 4.4%, P = .007, NNT = 23), prolonged hospitalization (one study, 1.9% vs 6.7%, 0.04, NNT = 21) and low five-minute Apgar scores (one study, 1.0% vs 5.6%, P = .03, NNT = 22), but more birth trauma (5.9% vs 0.6%, P = .005, NNH = 19, I = 0%). Compared groups had dissimilar demographic characteristics. Although studies scored 6-7/9 on risk-of-bias assessment, they were at high-risk for confounding by indication.
CONCLUSIONS
Evidence from observational studies suggests clinical equipoise regarding the optimal mode of delivery in women with BMI ≥ 40 kg/m and no prior CD. This question is best answered by a randomized trial. Based on an unplanned subgroup analysis, for women with BMI ≥ 40 kg/m and prior CD, repeat CD may be associated with better clinical outcomes.
Topics: Apgar Score; Birth Injuries; Body Mass Index; Cesarean Section; Delivery, Obstetric; Endometritis; Female; Humans; Infant, Newborn; Length of Stay; Obesity, Maternal; Obesity, Morbid; Postpartum Hemorrhage; Pregnancy; Surgical Wound Dehiscence
PubMed: 32997801
DOI: 10.1111/aogs.14011 -
BMC Pregnancy and Childbirth Jan 2014Tourette Syndrome (TS) appears to be an inherited disorder, although genetic abnormalities have been identified in less than 1% of patients, and the mode of inheritance... (Review)
Review
BACKGROUND
Tourette Syndrome (TS) appears to be an inherited disorder, although genetic abnormalities have been identified in less than 1% of patients, and the mode of inheritance is uncertain. Many studies have investigated environmental factors that might contribute to the onset and severity of tics and associated comorbidities such as obsessive compulsive disorder (OCD) and attention deficit hyperactive disorder (ADHD). A systematic review and qualitative analysis were performed to provide a broad view of the association between pre- and perinatal factors and TS.
METHODS
The Medline, Embase and PsycINFO databases were searched using terms specific to Tourette's syndrome and keywords such as "pregnancy", "prenatal", "perinatal", "birth" and "neonatal". Studies were limited to studies on human subjects published in English or French through October 2012.
RESULTS
22 studies were included. Studies were of limited methodological quality, with most samples derived from specialty clinics, and most exposures ascertained retrospectively. The majority of the results for demographic factors of parents, including age, education, socioeconomic status, and marital status, revealed no significant association with the onset of TS, or the presence of comorbidity. Many factors were reported to be significantly associated with the onset of TS, the presence of comorbidity and symptom severity, but the most consistently reported factors were maternal smoking and low birth weight.
CONCLUSIONS
There are few studies evaluating the relationship between pre and perinatal events and TS, and existing studies have major limitations, including the use of clinic rather than epidemiologically derived samples, retrospective data collection on pre and perinatal events and multiple hypothesis testing without appropriate statistical correction. The mechanism by which prenatal and perinatal adversities could lead to TS onset or symptom severity is unknown, but may be related to changes in the dopaminergic system as a result of early brain injury.
Topics: Birth Weight; Educational Status; Female; Humans; Male; Marital Status; Maternal Age; Paternal Age; Pregnancy; Prenatal Exposure Delayed Effects; Risk Factors; Smoking; Social Class; Tourette Syndrome
PubMed: 24479407
DOI: 10.1186/1471-2393-14-53 -
Frontiers in Neurology 2016Cerebral palsy (CP) is a complex multifactorial disorder, affecting approximately 2.5-3/1000 live term births, and up to 22/1000 prematurely born babies. CP results from... (Review)
Review
Cerebral palsy (CP) is a complex multifactorial disorder, affecting approximately 2.5-3/1000 live term births, and up to 22/1000 prematurely born babies. CP results from injury to the developing brain incurred before, during, or after birth. The most common form of this condition, spastic CP, is primarily associated with injury to the cerebral cortex and subcortical white matter as well as the deep gray matter. The major etiological factors of spastic CP are hypoxia/ischemia (HI), occurring during the last third of pregnancy and around birth age. In addition, inflammation has been found to be an important factor contributing to brain injury, especially in term infants. Other factors, including genetics, are gaining importance. The classic Rice-Vannucci HI model (in which 7-day-old rat pups undergo unilateral ligation of the common carotid artery followed by exposure to 8% oxygen hypoxic air) is a model of neonatal stroke that has greatly contributed to CP research. In this model, brain damage resembles that observed in severe CP cases. This model, and its numerous adaptations, allows one to finely tune the injury parameters to mimic, and therefore study, many of the pathophysiological processes and conditions observed in human patients. Investigators can recreate the HI and inflammation, which cause brain damage and subsequent motor and cognitive deficits. This model further enables the examination of potential approaches to achieve neural repair and regeneration. In the present review, we compare and discuss the advantages, limitations, and the translational value for CP research of HI models of perinatal brain injury.
PubMed: 27199883
DOI: 10.3389/fneur.2016.00057