Publications by authors named "Ahmed A Nassr"

Article Synopsis
  • * A total of 200 MMC cases were analyzed, showing that fetoscopic surgeries had longer median gestational ages at delivery and a significant percentage of vaginal births without major complications like uterine rupture.
  • * At the 30-month mark, children who underwent fetal interventions were more likely to be able to walk independently, and fewer required surgeries for complications such as tethered cord syndrome or spinal cysts compared to those who had postnatal repairs.
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Objective: Congenital viral infection may result in fetal anemia and thrombocytopenia. While intrauterine blood transfusions (IUTs) are more commonly performed for Rh alloimmunization, reports using IUT for infection have varying success. Our primary objective was to characterize the outcomes of patients undergoing IUT for infectious etiologies at our center compared with Rh disease.

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Introduction: Suture tensile properties have only been tested in extrauterine environments. Amniotic fluid (AF) is a complex milieu of enzymes and inflammatory factors. This study tested the mechanical properties of sutures with a variety of inherent properties, after exposure to AF from patients with conditions prompting fetal intervention.

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Objectives: Antenatal management of monochorionic pregnancies complicated by twin anemia polycythemia sequence (TAPS) remains sub-optimally defined. Our objective was to evaluate the safety and efficacy of fetoscopic selective laser photocoagulation with respect to fetal and neonatal survival.

Methods: A case series is reported with patients referred to the Texas Children's Fetal Center for evaluation and management of suspected spontaneous TAPS without concomitant twin-to-twin syndrome from 2014 to 2023.

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Objective: Fetal Lower Urinary Tract Obstruction (LUTO) is associated with oligohydramnios and significant fetal morbidity, resulting in poor lung development and perinatal death. However, oligohydramnios may develop at different gestational periods, and the impact of timing on fetal outcomes remains unknown. Our objective was to characterize the impact onset of oligohydramnios had on prenatal outcomes.

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To evaluate obstetrical outcomes for women having late amniocentesis (on or after 24 weeks). Electronic databases were searched from inception to January 1st, 2023. The obstetrical outcomes evaluated were gestational age at delivery, preterm birth (PTB) < 37 weeks, PTB within 1 week from amniocentesis, premature prelabor rupture of membranes (pPROM), chorionamnionitis, placental abruption, intrauterine fetal demise (IUFD) and termination of pregnancy (TOP).

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Article Synopsis
  • The study looked at two ways to treat a condition called stage I twin-to-twin transfusion syndrome in pregnant women: one way involved a special laser treatment, and the other was just waiting and monitoring.
  • Researchers checked several medical databases to gather information and compared the results from five different studies.
  • They found that there wasn’t a big difference in the survival of the babies between the two treatments and that using the laser treatment might not be necessary if the mother didn't have any serious problems.
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Objective: We aimed to evaluate whether there is a significant association between a placental pathology diagnosis basal plate myofibers (BPMF) in an index pregnancy with placenta accreta spectrum (PAS) in the subsequent pregnancy.

Study Design: We conducted a retrospective nested cohort study of all cases with a histopathological finding of BPMF between August 2012 and March 2020 at a single tertiary referral center. Data were collected for all subjects (cases and controls) with at least two consecutive pregnancies (the initial index pregnancy and at least one subsequent pregnancy) accompanied by a concomitant record of histopathological study of the placenta at our center.

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Introduction: Perinatal depression and anxiety are major causes of maternal morbidity, and are more common in high-risk pregnancies compared to low-risk pregnancies. This study used validated screening tools to assess the prevalence of depression and anxiety symptoms in pregnant patients who transferred their obstetric care to a specialized fetal center for fetal anomaly.

Methods: This is a prospective cohort of patients with a fetal anomaly prompting transfer of obstetric care to Texas Children's Hospital Fetal Center between January 2021 and February 2022.

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Article Synopsis
  • The study investigated how changes in fetal lung volume after fetoscopic endoluminal tracheal occlusion (FETO) impact survival rates and the necessity of ECMO for infants with congenital diaphragmatic hernia (CDH).
  • MRI metrics were used to assess lung volume and liver herniation, with results showing that a post-FETO increase in total lung volume of less than 10% was a significant predictor for lower survival rates and higher ECMO use.
  • It was concluded that fetuses experiencing less than a 10% increase in lung volume post-FETO face a higher risk of complications, including death and reliance on ECMO, when considering factors like gestational age and CDH severity.
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Selective fetal growth restriction (sFGR) complicates 10%-26% of monochorionic twins. Treatment options include cord coagulation, expectant management, and fetoscopic laser photocoagulation. This review compared laser to expectant management for situations when cord coagulation is not an option.

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Objective: We evaluate survival of fetuses with severe Lower Urinary Tract Obstruction (LUTO) based on bladder morphology. We hypothesize that fetuses with a "floppy" appearing bladder on initial prenatal ultrasound will have worse infant outcomes than fetuses with full/rounded bladders.

Method: We retrospectively reviewed all cases of LUTO evaluated in our fetal center between January 2013 and December 2021.

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Background: Neonates with congenital diaphragmatic hernia (CDH) have varying degrees of pulmonary hypoplasia, pulmonary hypertension (PH) and cardiac dysfunction. These neonates frequently require vasoactive support and are at high risk for mortality and morbidity, including prolonged ventilator support, need for extracorporeal membrane oxygenation (ECMO), prolonged length of stay, and need for tracheostomy. However, identifying which infants are at increased risk can be challenging.

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Article Synopsis
  • In utero repair of open neural tube defects can be performed through two main approaches: open hysterotomy, which has shown better motor outcomes, and laparotomy-assisted fetoscopic repair, which may have fewer complications.
  • This study evaluated the maternal and fetal complications of both surgical methods over a period from 2011 to 2021, using a classification system to rate the severity of complications.
  • Results indicated that the hybrid approach generally had a higher gestational age at surgery, a lower maternal BMI, and longer surgical duration, but it also resulted in fewer severe complications compared to the open approach.
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Objective: In fetuses with severe congenital diaphragmatic hernia, fetal endoluminal tracheal occlusion (FETO) with balloon increases survival and reduces morbidity. Balloon removal is often scheduled electively. In urgent cases, in-utero removal is impossible and removal immediately after delivery has to occur, posing risk of death from airway obstruction.

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Article Synopsis
  • The study aimed to evaluate the outcomes of twin-twin transfusion syndrome (TTTS) based on the middle cerebral artery pulsatility index (MCA-PI) before fetoscopic laser photocoagulation (FLPC) surgery.
  • A retrospective analysis of monochorionic twins affected by TTTS revealed that abnormal MCA-PI was present in 17.7% of cases, which was linked to higher rates of severe fetal growth restriction (sFGR) and decreased survival rates for the donor twin within 48 hours after surgery.
  • Findings suggest that an abnormal MCA-PI is associated with significantly lower survival rates for the donor twin at delivery and 30 days post-birth, indicating its potential importance in assessing prognosis in TTTS
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Objective: To compare the outcomes of dichorionic triamniotic (DCTA) triplets with that of monochorionic diamniotic (MCDA) twin gestations undergoing fetoscopic laser surgery (FLS) for treatment of twin-to-twin transfusion syndrome (TTTS).

Methods: Retrospective cohort study of prospectively collected data of consecutive DCTA triplet and MCDA twin pregnancies with TTTS that underwent FLS at two fetal treatment centers between 2012 and 2020. Preoperative, operative and, postoperative variables were collected.

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Background: Single fetal demise after intervention for twin-twin transfusion syndrome is a relatively common complication and is often devastating for the patients.

Objective: This meta-analysis aimed to evaluate the risk of single fetal demise based on gestational age and Quintero staging at the time of interventions in twin-to-twin transfusion syndrome after fetoscopic laser photocoagulation.

Study Design: Systematic search was performed in PubMed, Web of Science, and Scopus from inception to August 2021.

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Background: Ample evidence supports fetoscopic laser photocoagulation of placental anastomoses as a first-line treatment for twin-to-twin transfusion syndrome, but little is known about the outcomes following procedures conducted in the early second trimester.

Objective: This study aimed to evaluate perinatal outcomes following early fetoscopic laser placental photocoagulation performed for twin-to-twin transfusion syndrome at 16 weeks' gestation.

Study Design: This retrospective review included monochorionic twin pregnancies complicated by twin-to-twin transfusion syndrome necessitating fetoscopic laser photocoagulation at a single tertiary center from 2012 to 2021.

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Objectives: To evaluate the survival of twin-to-twin transfusion syndrome (TTTS) and concomitant twin anemia polycythemia sequence (TAPS) compared to TTTS without TAPS at the time of fetoscopic laser photocoagulation (FLP).

Methods: TTTS pregnancies undergoing FLP were divided to three groups including (i) traditional TAPS definition of middle cerebral artery (MCA) peak systolic velocity (PSV) < 1 multiple of the median (MoM) in recipient and > 1.5 MoM in the donor fetus, (ii) delta MCA-PSV > 0.

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This meta-analysis aims to compare the perinatal outcome of twin-twin transfusion syndrome (TTTS) pregnancies undergoing selective versus vascular equator (Solomon) fetoscopic laser photocoagulation (FLP). We performed a systematic search in PubMed and Web of Science from inception up to 25 July 2021. Studies comparing the Solomon and selective techniques of FLP for treatment of TTTS pregnancies were eligible.

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Objective: Determine the impact of indication for selective reduction (SR) on co-twin survival in monochorionic gestations undergoing radiofrequency ablation (RFA) or bipolar cord coagulation (BCC).

Methods: PubMed and Web of Science were systematically searched from inception of databases to April 2021. Frequency of indications was compared between post-intervention co-twin survival and demise groups undergoing SR.

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Objective: This systematic review and meta-analysis aimed to compare the fetal survival rate and perinatal outcomes of triplet pregnancies after selective reduction to twin pregnancies vs singleton pregnancies.

Data Sources: PubMed, Web of Science, Scopus, and Embase were systematically searched from the inception of the databases to January 16, 2022.

Study Eligibility Criteria: Studies comparing the survival and perinatal outcomes between reduction to twin pregnancies and reduction to singleton pregnancies were included.

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Background: Several studies have assessed preoperative and operative factors associated with fetal demise after laser for TTTS, yet these findings are not completely conclusive.

Objective: This study aimed to identify risk factors for single fetal demise (recipient and donor twins) after fetoscopic laser photocoagulation for twin-to-twin transfusion syndrome.

Study Design: We searched PubMed, Scopus, and Web of Science systematically from the inception of the database to June 2020.

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