Ramen H. Chmait, MD

Professor of Obstetrics & Gynecology (Clinical Scholar)

Director of Fetal Surgery Program

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Overview

Ramen Chmait, MD is Assistant Professor of Clinical Obstetrics and Gynecology, Pediatrics, and Surgery at the University of Southern California’s Keck School of Medicine. Dr. Chmait has served as director of Los Angeles Fetal Therapy since 2006. The Los Angeles Fetal Therapy is a program within the CHLA-USC Institute for Maternal-Fetal Health. In this capacity he has provided surgical treatment to hundreds of unborn children. Dr. Chmait also directs a research program devoted to understanding fetal disease and investigating potential treatment modalities.

Awards

U.S. News Top Doctors, 2011-2014
Fetal Hope: Light of Hope Award, 2008
UCSD Department of Reproductive Medicine: Fellows Teaching Award, 2003
Kaiser Permanente Los Angeles Medical Center : Resident Research Award, 2000

Publications

Management and Outcomes in Isolated Congenital Aqueductal Stenosis: A Single-Center Retrospective Cohort Study Prenat Diagn. 2025 Apr; 45(4):521-530. . View in PubMed
Gestational age at birth varies by surgical technique in prenatal open spina bifida repair: a systematic review and meta-analysis Am J Obstet Gynecol. 2025 Feb 19. . View in PubMed
Late Prenatal Development of Hindbrain Herniation in Open Spina Bifida Fetal Diagn Ther. 2025 Feb 13; 1-9. . View in PubMed
Vasa Previa: Prenatal Diagnosis and the Rationale Behind Using a 5 cm Distance from Internal Os J Clin Med. 2025 Feb 05; 14(3). . View in PubMed
The process of developing a comprehensive maternal-fetal surgery center Am J Obstet Gynecol MFM. 2025 Jan; 7(1):101557. . View in PubMed
Increased Intrauterine Transfusion Blood Volume Needed to Correct Fetal Anemia due to Placental Chorioangioma Fetal Diagn Ther. 2025; 52(1):90-96. . View in PubMed
Vasa previa in singleton pregnancies: diagnosis and clinical management based on an international expert consensusAm J Obstet Gynecol. 2024 Dec; 231(6):638. e1-638. e24. . View in PubMed
Safety of Intrauterine Transfusion Performed Beyond 34 weeks of Gestation Prenat Diagn. 2024 12; 44(13):1614-1621. . View in PubMed
Fetoscopic laser photocoagulation: a medically reasonable treatment option in the management of types II and III vasa previa J Perinat Med. 2024 Nov 26; 52(9):927-933. . View in PubMed
Cord Occlusion in Twin Reversed Arterial Perfusion Sequence: A Retrospective Study of Laser Photocoagulation versus Radiofrequency Ablation Fetal Diagn Ther. 2024 Nov 07; 1-8. . View in PubMed
Sleep-related breathing disorders in infants with spina bifida repaired prenatally and postnatally J Clin Sleep Med. 2024 Oct 01; 20(10):1579-1583. . View in PubMed
Randomized controlled trial of twin-twin transfusion syndrome laser surgery: the sequential trialAm J Obstet Gynecol. 2024 Sep; 231(3):365. e1-365. e15. . View in PubMed
Fetoscopic Laser Ablation of Type II Vasa Previa: A Cost Benefit Analysis Am J Perinatol. 2024 05; 41(S 01):e2454-e2462. . View in PubMed
Multimodal Management of Cervical Insufficiency Complicated by Intra-amniotic Candida albicans Infection Am J Perinatol. 2024 05; 41(S 01):e1463-e1469. . View in PubMed
Consensus protocol for management of early and late twin-twin transfusion syndrome: Delphi study Ultrasound Obstet Gynecol. 2024 03; 63(3):371-377. . View in PubMed
Perinatal survival following intrauterine transfusion for red cell alloimmunized pregnancies: systematic review and meta-regression Am J Obstet Gynecol. 2024 03; 230(3):e1-e2. . View in PubMed
Third-trimester fetoscopic ablation therapy for types II and III vasa previaAm J Obstet Gynecol. 2024 01; 230(1):87. e1-87. e9. . View in PubMed
Revisiting MOMS criteria for prenatal repair of spina bifida: upper gestational-age limit should be raised and assessment of prenatal motor function rather than anatomical level improves prediction of postnatal function Ultrasound Obstet Gynecol. 2024 01; 63(1):53-59. . View in PubMed
Neonatal Survival After Serial Amnioinfusions for Bilateral Renal Agenesis: The Renal Anhydramnios Fetal Therapy Trial JAMA. 2023 12 05; 330(21):2096-2105. . View in PubMed
Subclassification of fetal growth restriction type IIa vs type IIb applied to twin-twin transfusion syndrome Am J Obstet Gynecol MFM. 2023 09; 5(9):101082. . View in PubMed
Outcome of laser photocoagulation in monochorionic diamniotic twin pregnancy complicated by Type-II selective fetal growth restriction Ultrasound Obstet Gynecol. 2023 09; 62(3):369-373. . View in PubMed
Neuropathology Evaluation of in Utero Correction of Myelomeningocele and Complications of Late-Onset GBS Infection Fetal Pediatr Pathol. 2023 Aug; 42(4):535-544. . View in PubMed
Advances in Fetal Surgical Repair of Open Spina Bifida Obstet Gynecol. 2023 03 01; 141(3):505-521. . View in PubMed
Solomon versus selective fetoscopic laser photocoagulation for twin-twin transfusion syndrome: A systematic review and meta-analysis Prenat Diagn. 2023 01; 43(1):72-83. . View in PubMed
Prenatal repair of gastroschisis using partial carbon dioxide insufflation fetoscopy: lessons learned Einstein (Sao Paulo). 2023; 21:eRC0543. . View in PubMed
Primum, non nocere: Whole blood, prehospital transfusion and anti-D hemolytic disease of the fetus and newborn Transfusion. 2023 01; 63(1):249-256. . View in PubMed
Correction of fetal umbilical vein flow imbalance following laser surgery for twin-twin transfusion syndrome Ultrasound Obstet Gynecol. 2022 12; 60(6):774-779. . View in PubMed
The quantitative lung index: the left lung J Matern Fetal Neonatal Med. 2022 Nov; 35(21):4142-4148. . View in PubMed
Percutaneous/mini-laparotomy fetoscopic repair of open spina bifida: a novel surgical technique Am J Obstet Gynecol. 2022 09; 227(3):375-383. . View in PubMed
Design and Protocol of the Renal Anhydramnios Fetal Therapy (RAFT) Trial Clin Ther. 2022 08; 44(8):1161-1171. . View in PubMed
Selective intrauterine growth restriction (SIUGR) type II: proposed subclassification to guide surgical management J Matern Fetal Neonatal Med. 2022 Mar; 35(6):1184-1191. . View in PubMed
Outcomes of laser surgery for stage I twin-twin transfusion syndrome Prenat Diagn. 2022 Feb; 42(2):172-179. . View in PubMed
In utero Treatment of Congenital High Airway Obstruction Syndrome via Fetal Laryngoscopy and EXIT Procedure Fetal Diagn Ther. 2022; 49(9-10):385-393. . View in PubMed
Amylase concentration and activity in the amniotic fluid of fetal rats with retinoic acid induced myelomeningocele J Matern Fetal Neonatal Med. 2022 Jan; 35(1):147-154. . View in PubMed
Current Status of the Workforce and Training at Fetal Therapy Centers in North America Fetal Diagn Ther. 2022; 49(7-8):333-339. . View in PubMed
Twin-twin transfusion syndrome and the definition of recipient polyhydramniosAm J Obstet Gynecol. 2021 12; 225(6):683. e1-683. e8. . View in PubMed
Antenatal course of referred monochorionic diamniotic twins complicated by selective intrauterine growth restriction (SIUGR) type III J Matern Fetal Neonatal Med. 2021 Dec; 34(23):3867-3873. . View in PubMed
Experience of 300 cases of prenatal fetoscopic open spina bifida repair: report of the International Fetoscopic Neural Tube Defect Repair ConsortiumAm J Obstet Gynecol. 2021 12; 225(6):678. e1-678. e11. . View in PubMed
Dual demise following laser surgery for twin-twin transfusion syndrome: Analysis of 52 cases at a single fetal surgery center Prenat Diagn. 2021 Nov; 41(12):1548-1559. . View in PubMed
Percutaneous fetoscopic spina bifida repair: effect on ambulation and need for postnatal cerebrospinal fluid diversion and bladder catheterization Ultrasound Obstet Gynecol. 2021 Oct; 58(4):582-589. . View in PubMed
Fetal blood gases after in utero carbon dioxide insufflation for percutaneous fetoscopic spina bifida repair Am J Obstet Gynecol MFM. 2021 09; 3(5):100409. . View in PubMed
Risk Factors for Parenting Stress in Parents of Children Treated with Laser Surgery for Twin-Twin Transfusion Syndrome 2 Years Postpartum Am J Perinatol. 2021 07; 38(9):944-951. . View in PubMed
Complicated Monochorionic-Diamniotic Twins in a Pregnant Woman with COVID-19 in the Second Trimester Am J Perinatol. 2021 06; 38(7):747-752. . View in PubMed
Neurodevelopmental outcome of monochorionic twins with selective intrauterine growth restriction (SIUGR) type II: laser versus expectant management J Matern Fetal Neonatal Med. 2021 May; 34(10):1513-1521. . View in PubMed
Fetal neurodevelopmental recovery in donors after laser surgery for twin-twin transfusion syndrome Prenat Diagn. 2021 01; 41(2):190-199. . View in PubMed
Evaluation of cardiac function in the recipient twin in successfully treated twin-to-twin transfusion syndrome using a novel fetal speckle-tracking analysis Prenat Diagn. 2021 01; 41(1):136-144. . View in PubMed
Procedural, pregnancy, and short-term outcomes after fetal aortic valvuloplasty Catheter Cardiovasc Interv. 2020 09 01; 96(3):626-632. . View in PubMed
Delivery timing after laser surgery for twin-twin transfusion syndrome J Perinatol. 2020 02; 40(2):248-255. . View in PubMed
Twin-Twin Transfusion Syndrome Complicated by Proximate Placental Cord Insertion Sites: Endoscopic Clip-Assisted Laser Occlusion Fetal Diagn Ther. 2020; 47(10):779-784. . View in PubMed
Response to Commentary by Saeid Safiri et al J Matern Fetal Neonatal Med. 2020 01; 33(1):171. . View in PubMed
Fetoscopic Laser Ablation Therapy for Type II Vasa Previa Fetal Diagn Ther. 2020; 47(9):682-688. . View in PubMed
Percent Absent End-Diastolic Velocity in the Umbilical Artery and Donor Twin Demise after Laser Surgery for Twin-Twin Transfusion Syndrome Fetal Diagn Ther. 2020; 47(7):572-579. . View in PubMed
Membrane Separation and Perinatal Outcomes after Laser Treatment for Twin-Twin Transfusion Syndrome Fetal Diagn Ther. 2020; 47(4):307-314. . View in PubMed
Survival Outcomes by Fetal Weight Discordance after Laser Surgery for Twin-Twin Transfusion Syndrome Complicated by Donor Fetal Growth Restriction Fetal Diagn Ther. 2020; 47(11):800-809. . View in PubMed
Perinatal Management of Bart’s Hemoglobinopathy: Paradoxical Effects of Intrauterine, Transplacental, and Partial Exchange Transfusions AJP Rep. 2020 Jan; 10(1):e11-e14. . View in PubMed
Risk Factors for Co-Twin Fetal Demise following Radiofrequency Ablation in Multifetal Monochorionic Gestations Fetal Diagn Ther. 2020; 47(11):817-823. . View in PubMed
Is there a role for fetoscopic laser ablation therapy in Type-2 vasa previa? Ultrasound Obstet Gynecol. 2019 Nov; 54(5):696.. View in PubMed
Uterine legacy of open maternal-fetal surgery: preterm uterine rupture Am J Obstet Gynecol. 2019 11; 221(5):535. . View in PubMed
Ultrasound-guided in Utero Transplantation of Placental Stem Cells into the Liver of Crigler-Najjar Syndrome Model Rat Transplantation. 2019 07; 103(7):e182-e187. . View in PubMed
Inadvertent Perforation of a Gravid Uterus During Laparoscopy JSLS. 2019 Jul-Sep; 23(3). . View in PubMed
Case 1: Cardiac Arrest in a 2-month-old Boy with a Prenatal Course Complicated by Alloimmunization Pediatr Rev. 2019 May; 40(5):243-246. . View in PubMed
Prenatal diagnosis and management of congenital complete heart block Birth Defects Res. 2019 05 01; 111(8):380-388. . View in PubMed
Quantitative fetal fibronectin to predict spontaneous preterm delivery after laser surgery for twin-twin transfusion syndrome Sci Rep. 2019 03 14; 9(1):4438. . View in PubMed
Characteristics of referred patients with twin-twin transfusion syndrome who did not undergo fetal therapy Prenat Diagn. 2019 03; 39(4):280-286. . View in PubMed
Midtrimester isolated oligohydramnios in monochorionic diamniotic multiple gestations J Matern Fetal Neonatal Med. 2019 Feb; 32(4):590-596. . View in PubMed
Long-Term Outcomes After Thoracoamniotic Shunt for Pleural Effusions With Secondary Hydrops J Surg Res. 2019 01; 233:304-309. . View in PubMed
In utero Fetal Intubation for a Large Neck Mass: A Minimally Invasive EXIT Option Fetal Diagn Ther. 2019; 45(4):275-280. . View in PubMed
Neonatal cerebral lesions predict 2-year neurodevelopmental impairment in children treated with laser surgery for twin-twin transfusion syndrome J Matern Fetal Neonatal Med. 2019 Jan; 32(1):80-84. . View in PubMed
Percutaneous fetoscopic closure of large open spina bifida using a bilaminar skin substitute Ultrasound Obstet Gynecol. 2018 Oct; 52(4):458-466. . View in PubMed
Risks of Preterm Premature Rupture of Membranes and Preterm Birth Post Fetoscopy Based on Location of Trocar Insertion Site Am J Perinatol. 2018 07; 35(8):801-808. . View in PubMed
Minimally Invasive Implantation of a Micropacemaker Into the Pericardial Space Circ Arrhythm Electrophysiol. 2018 07; 11(7):e006307. . View in PubMed
The Use of Fetal Bronchoscopy in the Diagnosis and Management of a Suspected Obstructive Lung Mass AJP Rep. 2018 Jul; 8(3):e195-e200. . View in PubMed
Middle Cerebral Artery Doppler Changes following Fetal Transfusion Performed with and without Fetal Anesthesia Am J Perinatol. 2018 06; 35(7):682-687. . View in PubMed
Types II and III congenital pulmonary airway malformation with hydrops treated in utero with percutaneous sclerotherapy Prenat Diagn. 2018 06; 38(7):493-498. . View in PubMed
The impact of laser surgery on angiogenic and anti-angiogenic factors in twin-twin transfusion syndrome: a prospective study J Matern Fetal Neonatal Med. 2018 Apr; 31(8):1085-1091. . View in PubMed
Management of twin-twin transfusion syndrome with an extremely short cervix J Obstet Gynaecol. 2018 Apr; 38(3):359-362. . View in PubMed
Re: Monochorionic diamniotic twin pregnancy with selective fetal growth restriction Type II: sonographic and fetoscopic findings of poor prognosis Ultrasound Obstet Gynecol. 2018 02; 51(2):280. . View in PubMed
The relationship between preoperative fetal head circumference and 2-year cognitive performance after laser surgery for twin-twin transfusion syndrome Prenat Diagn. 2018 02; 38(3):173-178. . View in PubMed
Comparison of umbilical cord occlusion methods: Radiofrequency ablation versus laser photocoagulation Prenat Diagn. 2018 01; 38(2):110-116. . View in PubMed
Iodine-Induced Fetal Hypothyroidism: Diagnosis and Treatment with Intra-Amniotic Levothyroxine Horm Res Paediatr. 2018; 90(6):419-423. . View in PubMed
Incidental Septostomy after Laser Surgery for Twin-Twin Transfusion Syndrome: Perinatal Outcomes and Antenatal Management Fetal Diagn Ther. 2018; 44(4):285-290. . View in PubMed
A Complication of Percutaneous Sclerotherapy for Congenital Pulmonary Airway Malformation: Intravascular Injection and Cardiac Necrosis Fetal Pediatr Pathol. 2017 Dec; 36(6):437-444. . View in PubMed
Risk factors for fetomaternal bleeding after laser therapy for twin-twin transfusion syndrome Prenat Diagn. 2017 12; 37(12):1232-1237. . View in PubMed
Doppler US in the Evaluation of Fetal Growth and Perinatal Health Radiographics. 2017 Oct; 37(6):1831-1838. . View in PubMed
Pseudoamniotic Band Syndrome Post Fetal Thoracoamniotic Shunting for Bilateral Hydrothorax Fetal Pediatr Pathol. 2017 08; 36(4):311-318. . View in PubMed
Recipient Twin Circular Shunt Physiology Before Fetal Laser Surgery: Survival and Risks for Postnatal Right Ventricular Outflow Tract Obstruction J Ultrasound Med. 2017 Aug; 36(8):1595-1605. . View in PubMed
Amniopatch treatment of iatrogenic preterm premature rupture of membranes (iPPROM) after fetoscopic laser surgery for twin-twin transfusion syndrome J Matern Fetal Neonatal Med. 2017 Jun; 30(11):1349-1354. . View in PubMed
Design and Testing of a Transcutaneous RF Recharging System for a Fetal Micropacemaker IEEE Trans Biomed Circuits Syst. 2017 04; 11(2):336-346. . View in PubMed
Salvage of Necrotic-Appearing Limb after In Utero Endoscopic Lysis of Constriction Bands AJP Rep. 2017 Apr; 7(2):e74-e78. . View in PubMed
Analytical Modeling for Computing Lead Stress in a Novel Epicardial Micropacemaker Cardiovasc Eng Technol. 2017 03; 8(1):96-105. . View in PubMed
Umbilical Cord Occlusion via Laser Coagulation in Monochorionic Multifetal Gestations before and after 20 Weeks of Gestation Fetal Diagn Ther. 2017; 42(1):9-16. . View in PubMed
Fetal Serum ß2-Microglobulin and Postnatal Renal Function in Lower Urinary Tract Obstruction Treated with Vesicoamniotic Shunt Fetal Diagn Ther. 2017; 42(1):17-27. . View in PubMed
Generalized Arterial Calcification in a Recipient Twin: Discordant Fetal Hemodynamics Result in Differing Phenotypes in Monozygotic Twins with an ABCC6 Mutation Fetal Diagn Ther. 2017; 41(3):234-236. . View in PubMed
Minimally invasive implantable fetal micropacemaker: mechanical testing and technical refinements Med Biol Eng Comput. 2016 Dec; 54(12):1819-1830. . View in PubMed
Amniotic fluid levels of phospholipase A2 in fetal rats with retinoic acid induced myelomeningocele: the potential “second hit” in neurologic damage J Matern Fetal Neonatal Med. 2016 Sep; 29(18):3003-8. . View in PubMed
Fetoscopic repair of spina bifida: safer and better? Ultrasound Obstet Gynecol. 2016 Aug; 48(2):141-7.. View in PubMed
Twin-to-Twin Transfusion Syndrome: Definition, Staging, and Ultrasound Assessment Twin Res Hum Genet. 2016 06; 19(3):175-83. . View in PubMed
Laser Treatment of Twin-to-Twin Transfusion Syndrome Twin Res Hum Genet. 2016 06; 19(3):197-206. . View in PubMed
Fetal brain-sparing after laser surgery for twin-twin transfusion syndrome appears associated with two-year neurodevelopmental outcomes Prenat Diagn. 2016 Jan; 36(1):63-7. . View in PubMed
Decreased Total Placental Mass Found in Twin-Twin Transfusion Syndrome Gestations with Selective Growth Restriction Fetal Diagn Ther. 2016; 40(2):116-22. . View in PubMed
Endoscopic surgery for the antenatal treatment of myelomeningocele: the CECAM trialAm J Obstet Gynecol. 2016 Jan; 214(1):111. e1-111. e11. . View in PubMed
Selective Reduction Using Intravascular Potassium Chloride Injection after Laser Surgery for Twin-Twin Transfusion Syndrome Fetal Diagn Ther. 2016; 39(4):306-10. . View in PubMed
Donor catch-up growth after laser surgery for twin-twin transfusion syndrome Early Hum Dev. 2015 Dec; 91(12):751-4. . View in PubMed
Blood pressure evaluation in children treated with laser surgery for twin-twin transfusion syndrome at 2-year follow-upAm J Obstet Gynecol. 2015 Sep; 213(3):417. e1-7. . View in PubMed
Perinatal survival in cases of twin-twin transfusion syndrome complicated by selective intrauterine growth restriction J Matern Fetal Neonatal Med. 2015 Sep; 28(13):1549-53. . View in PubMed
Am J Obstet Gynecol. 2015 Aug; 213(2):245-6. . View in PubMed
International Fetal Cardiac Intervention Registry: A Worldwide Collaborative Description and Preliminary Outcomes J Am Coll Cardiol. 2015 Jul 28; 66(4):388-99. . View in PubMed
Preclinical testing and optimization of a novel fetal micropacemaker Heart Rhythm. 2015 Jul; 12(7):1683-90. . View in PubMed
Abnormal umbilical artery Doppler findings in the recipient twin before laser surgery for twin-twin transfusion syndrome J Ultrasound Med. 2015 May; 34(5):843-6. . View in PubMed
Treatment of alpha(0)-thalassemia (–(SEA)/–(SEA)) via serial fetal and post-natal transfusions: Can early fetal intervention improve outcomes? Hematology. 2015 May; 20(4):217-22.. View in PubMed
Identification of essential steps in laser procedure for twin-twin transfusion syndrome using the Delphi methodology: SILICONE study Ultrasound Obstet Gynecol. 2015 Apr; 45(4):439-46. . View in PubMed
Chlorhexidine gluconate versus povidone iodine at cesarean delivery: a randomized controlled trial J Matern Fetal Neonatal Med. 2015 Mar; 28(5):573-7. . View in PubMed
Giant chorioangioma treated in utero via laser of feeding vessels with subsequent development of multifocal infantile hemangiomas Fetal Pediatr Pathol. 2015 Feb; 34(1):1-8. . View in PubMed
Treatment of Complicated Spontaneous Twin Anemia-Polycythemia Sequence via Fetoscopic Laser Ablation of the Vascular Communications Fetal Diagn Ther. 2015; 38(3):233-7. . View in PubMed
Pre-Operative Twin Anemia/Polycythemia in the Setting of Twin-Twin Transfusion Syndrome (TTTS) Fetal Diagn Ther. 2015; 37(4):274-80. . View in PubMed
Fetoscopic single-layer repair of open spina bifida using a cellulose patch: preliminary clinical experience J Matern Fetal Neonatal Med. 2014 Nov; 27(16):1613-9. . View in PubMed
Predictors of 2-year cognitive performance after laser surgery for twin-twin transfusion syndromeAm J Obstet Gynecol. 2014 Oct; 211(4):388. e1-7. . View in PubMed
Sequential laser surgery for twin-twin transfusion syndrome Am J Perinatol. 2014 Sep; 31 Suppl 1:S13-8. . View in PubMed
Midtrimester isolated polyhydramnios in monochorionic diamniotic multiple gestationsAm J Obstet Gynecol. 2014 Sep; 211(3):303. e1-5. . View in PubMed
Dual twin survival after laser surgery for twin-twin transfusion syndrome Ultrasound Obstet Gynecol. 2014 Aug; 44(2):244. . View in PubMed
Chorioamniotic membrane separation over the cervical os (“moon sign”) in twin-twin transfusion syndrome J Ultrasound Med. 2014 Jul; 33(7):1147-54. . View in PubMed
A percutaneously implantable fetal pacemaker Annu Int Conf IEEE Eng Med Biol Soc. 2014; 2014:4459-63. . View in PubMed
Term vaginal delivery following fetoscopic laser photocoagulation of type II vasa previa Fetal Diagn Ther. 2014; 35(1):62-4. . View in PubMed
Perioperative characteristics associated with preterm birth in twin-twin transfusion syndrome treated by laser surgeryAm J Obstet Gynecol. 2013 Sep; 209(3):264. e1-8. . View in PubMed
Laser treatment of twin-twin transfusion syndrome: what do the data really show? Am J Obstet Gynecol. 2013 Aug; 209(2):157-8.. View in PubMed
Chimerism in monochorionic dizygotic twins: case study and review Am J Med Genet A. 2013 Jul; 161A(7):1817-24. . View in PubMed
The observed vsexpected lung-to-head ratio does not correct for the effect of gestational age on the lung-to-head ratio. J Matern Fetal Neonatal Med. 2013 Apr; 26(6):552-7. . View in PubMed
Mutation in an mtDNA protein-coding gene: prenatal diagnosis aided by fetal muscle biopsy J Child Neurol. 2013 Feb; 28(2):264-8. . View in PubMed
Maternal hemolysis after intravenous immunoglobulin treatment in fetal and neonatal alloimmune thrombocytopenia Obstet Gynecol. 2013 Feb; 121(2 Pt 2 Suppl 1):471-3. . View in PubMed
Middle cerebral artery Doppler and hemoglobin changes immediately following fetal transfusion J Matern Fetal Neonatal Med. 2013 Jan; 26(2):155-7. . View in PubMed
Design and testing of a percutaneously implantable fetal pacemaker Ann Biomed Eng. 2013 Jan; 41(1):17-27. . View in PubMed
Intraluminal tracheal occlusion using a modified 8-mm Z-stent in a sheep model of left-sided congenital diaphragmatic hernia J Matern Fetal Neonatal Med. 2012 Nov; 25(11):2346-53. . View in PubMed
Prevalence and risk factors of cerebral lesions in neonates after laser surgery for twin-twin transfusion syndromeAm J Obstet Gynecol. 2012 Oct; 207(4):320. e1-6. . View in PubMed
Vascular limb occlusion in twin-twin transfusion syndrome (TTTS): case series and literature reviewAm J Obstet Gynecol. 2012 Aug; 207(2):131. e1-10. . View in PubMed
Prevalence of noncardiac structural anomalies in twin-twin transfusion syndrome J Ultrasound Med. 2012 Apr; 31(4):555-60. . View in PubMed
Incidental fetoscopy during laparoscopy in pregnancy: management of perforation of the gravid uterus Surg Laparosc Endosc Percutan Tech. 2012 Apr; 22(2):e76-8. . View in PubMed
In utero release of constriction amniotic bands via blunt dissection Fetal Pediatr Pathol. 2012 Feb; 31(1):25-9. . View in PubMed
Percutaneously injectable fetal pacemaker: electrodes, mechanical design and implantation Annu Int Conf IEEE Eng Med Biol Soc. 2012; 2012:6600-3. . View in PubMed
Treatment of congenital pulmonary airway malformation induced hydrops fetalis via percutaneous sclerotherapy Fetal Diagn Ther. 2012; 31(4):264-8. . View in PubMed
Percutaneously injectable fetal pacemaker: electronics, pacing thresholds, and power budget Annu Int Conf IEEE Eng Med Biol Soc. 2012; 2012:5730-3. . View in PubMed
Fetoscopic laser photocoagulation of feeding vessels to a large placental chorioangioma following fetal deterioration after amnioreduction Fetal Diagn Ther. 2012; 31(3):191-5. . View in PubMed
The quantitative lung index (QLI): a gestational age-independent sonographic predictor of fetal lung growthAm J Obstet Gynecol. 2011 Dec; 205(6):544. e1-8. . View in PubMed
Neurodevelopmental outcomes after laser therapy for twin-twin transfusion syndrome: a systematic review and meta-analysis Obstet Gynecol. 2011 Nov; 118(5):1145-1150. . View in PubMed
Fetoscopic documentation of meconium passage at 19 weeks’ gestation Clin Gastroenterol Hepatol. 2011 Nov; 9(11):e120. . View in PubMed
Twin-twin transfusion syndrome treated with laser surgery: postnatal prevalence of congenital heart disease in surviving recipients and donors Prenat Diagn. 2011 Oct; 31(10):973-7. . View in PubMed
Role of low placental share in twin-twin transfusion syndrome complicated by intrauterine growth restriction Placenta. 2011 Aug; 32(8):616-8. . View in PubMed
Duplicity: Sonography suggested a twin gestation was dichorionic-and monochorionicAm J Obstet Gynecol. 2011 Jul; 205(1):87. e1-2. . View in PubMed
Fetal middle cerebral artery Doppler fluctuations after laser surgery for twin-twin transfusion syndrome J Perinatol. 2011 May; 31(5):368-72. . View in PubMed
Stage-based outcomes of 682 consecutive cases of twin-twin transfusion syndrome treated with laser surgery: the USFetus experienceAm J Obstet Gynecol. 2011 May; 204(5):393. e1-6. . View in PubMed
Neonatal outcomes of twins according to birth order, presentation and mode of delivery: a systematic review and meta-analysis BJOG. 2011 Apr; 118(5):523-32. . View in PubMed
Twin-to-twin transfusion syndrome (TTTS) J Perinat Med. 2011 03; 39(2):107-12. . View in PubMed
Spontaneous twin anemia-polycythemia sequence complicated by recipient placental vascular thrombosis and hydrops fetalis J Matern Fetal Neonatal Med. 2011 Mar; 24(3):549-52. . View in PubMed
Normalization of amniotic fluid levels after fetoscopic laser surgery for twin-twin transfusion syndrome J Ultrasound Med. 2010 Oct; 29(10):1431-6. . View in PubMed
Discordant blood chimerism in dizygotic monochorionic laser-treated twin-twin transfusion syndrome Obstet Gynecol. 2010 Aug; 116 Suppl 2:483-485. . View in PubMed
In utero management of fetal lower urinary tract obstruction with a novel shunt: a landmark development in fetal therapy J Matern Fetal Neonatal Med. 2010 Aug; 23(8):806-12. . View in PubMed
Residual vascular communications in twin-twin transfusion syndrome treated with sequential laser surgery: frequency and clinical implications Placenta. 2010 Jul; 31(7):611-4. . View in PubMed
Triplets with feto-fetal transfusion syndrome treated with laser ablation: the USFetus experience J Matern Fetal Neonatal Med. 2010 May; 23(5):361-5. . View in PubMed
Third trimester fetoscopic laser ablation of type II vasa previa J Matern Fetal Neonatal Med. 2010 May; 23(5):459-62. . View in PubMed
Trocar-assisted selective laser photocoagulation of communicating vessels: a technique for the laser treatment of patients with twin-twin transfusion syndrome with inaccessible anterior placentas J Matern Fetal Neonatal Med. 2010 Apr; 23(4):330-4. . View in PubMed
Fetal heart rate changes associated with sequential selective laser surgery for twin-twin transfusion syndrome J Perinatol. 2010 Mar; 30(3):188-91. . View in PubMed
Emergency postpartum hysterectomy for uncontrolled postpartum bleeding: a systematic review Obstet Gynecol. 2010 Mar; 115(3):637-644. . View in PubMed
Postoperative middle cerebral artery peak systolic velocity changes confirm physiological principles of the sequential laser technique for twin-twin transfusion syndrome Fetal Diagn Ther. 2010; 28(3):140-4. . View in PubMed
Perinatal survival following preferential sequential selective laser surgery for twin-twin transfusion syndrome J Matern Fetal Neonatal Med. 2010 Jan; 23(1):10-6. . View in PubMed
Amniopatch as a treatment for rupture of membranes following laser surgery for twin-twin transfusion syndrome Fetal Diagn Ther. 2010; 27(3):134-7. . View in PubMed
Twin-twin transfusion syndrome in a dichorionic-monozygotic twin pregnancy: The end of a paradigm? Fetal Pediatr Pathol. 2010 Jan; 29(2):81-8.. View in PubMed
Fetoscopic management of complicated monochorionic twins Clin Obstet Gynecol. 2009 Dec; 52(4):647-53. . View in PubMed
Umbilical artery hypoplasia in twin-twin transfusion syndrome complicated by discordant umbilical artery Doppler findings in the donor twin: a diagnostic dilemma J Ultrasound Med. 2009 Aug; 28(8):1107-10. . View in PubMed
Complete right heart flow reversal: pathognomonic recipient twin circular shunt in twin-twin transfusion syndrome J Ultrasound Med. 2009 Aug; 28(8):1101-6. . View in PubMed
Are patients with twin-twin transfusion syndrome and a very short cervix candidates for laser surgery? J Ultrasound Med. 2009 May; 28(5):633-9.. View in PubMed
Prenatal diagnosis of spontaneous septostomy of the dividing membranes in complicated monochorionic diamniotic multiple gestations J Ultrasound Med. 2009 May; 28(5):663-8. . View in PubMed
The con trial Am J Obstet Gynecol. 2009 Mar; 200(3):e14-5; author reply e15. . View in PubMed
In utero fetal oximetry via visible light spectroscopy in twin-twin transfusion syndromeAm J Obstet Gynecol. 2008 Dec; 199(6):639. e1-4. . View in PubMed
Complementary roles of sonography and magnetic resonance imaging in the assessment of fetal urinary tract anomalies J Ultrasound Med. 2008 Nov; 27(11):1563-9. . View in PubMed
Fetal growth after laser therapy for twin-twin transfusion syndromeAm J Obstet Gynecol. 2008 Jul; 199(1):47. e1-6. . View in PubMed
Operative fetoscopy in complicated monochorionic twins: current status and future direction Curr Opin Obstet Gynecol. 2008 Apr; 20(2):169-74. . View in PubMed
Sequential selective laser photocoagulation of communicating vessels in twin-twin transfusion syndrome J Matern Fetal Neonatal Med. 2007 Oct; 20(10):763-8. . View in PubMed
Percent absent end-diastolic velocity in the umbilical artery waveform as a predictor of intrauterine fetal demise of the donor twin after selective laser photocoagulation of communicating vessels in twin-twin transfusion syndrome Ultrasound Obstet Gynecol. 2007 Jul; 30(1):35-9. . View in PubMed
Paradoxical scalloped placenta with polyhydramnios in twin-twin transfusion syndrome J Matern Fetal Neonatal Med. 2007 Jan; 20(1):29-32. . View in PubMed
The role of laser surgery in dissecting the etiology of absent or reverse end-diastolic velocity in the umbilical artery of the donor twin in twin-twin transfusion syndrome Am J Obstet Gynecol. 2006 Aug; 195(2):478-83. . View in PubMed
Surgical management of twin reversed arterial perfusion sequence Am J Obstet Gynecol. 2006 Apr; 194(4):982-91. . View in PubMed
Prenatal detection of associated anomalies in fetuses diagnosed with cleft lip with or without cleft palate in utero Ultrasound Obstet Gynecol. 2006 Feb; 27(2):173-6. . View in PubMed
Management of twin-twin transfusion syndrome in pregnancies with iatrogenic detachment of membranes following therapeutic amniocentesis and the role of interim amniopatch Ultrasound Obstet Gynecol. 2005 Nov; 26(6):628-33. . View in PubMed
In utero cardiac fetal surgery: laser atrial septotomy in the treatment of hypoplastic left heart syndrome with intact atrial septum Am J Obstet Gynecol. 2005 Oct; 193(4):1424-8. . View in PubMed
Prospective observational study to establish predictors of glyburide success in women with gestational diabetes mellitus J Perinatol. 2004 Oct; 24(10):617-22. . View in PubMed
Ultrasound assessment of venous blood flow before and after laser therapy: approach to understanding the pathophysiology of twin-twin transfusion syndrome Ultrasound Obstet Gynecol. 2004 Aug; 24(2):164-8. . View in PubMed
Intra-amniotic Doppler measurement of blood flow in placental vascular anastomoses in twin-twin transfusion syndrome Ultrasound Obstet Gynecol. 2004 Jul; 24(1):102-3. . View in PubMed
Umbilical cord occlusion of the donor versus recipient fetus in twin-twin transfusion syndrome Ultrasound Obstet Gynecol. 2004 May; 23(5):446-50. . View in PubMed
The cocoon sign: a potential sonographic pitfall in the diagnosis of twin – twin transfusion syndrome Ultrasound Obstet Gynecol. 2004 Jan; 23(1):38-41. . View in PubMed
Preterm premature rupture of membranes: vascular endothelial growth factor and its association with histologic chorioamnionitis Am J Obstet Gynecol. 2002 Nov; 187(5):1131-6. . View in PubMed
Nasal glioma Ultrasound Obstet Gynecol. 2002 Oct; 20(4):417-8. . View in PubMed
Prenatal evaluation of facial clefts with two-dimensional and adjunctive three-dimensional ultrasonography: a prospective trial Am J Obstet Gynecol. 2002 Oct; 187(4):946-9. . View in PubMed
Protease inhibitors and decreased birth weight in HIV-infected pregnant women with impaired glucose tolerance J Perinatol. 2002 Jul-Aug; 22(5):370-3. . View in PubMed
Doppler ultrasonographic evaluation of twins discordant for Rh alloimmunization Am J Obstet Gynecol. 2002 Jul; 187(1):250-1. . View in PubMed
Placental pathology casebookUnusually large acardiac twin pregnancy at term. J Perinatol. 2001 Mar; 21(2):150-2. . View in PubMed
Hemophagocytic syndrome in pregnancy Obstet Gynecol. 2000 Jun; 95(6 Pt 2):1022-4. . View in PubMed

Ramen H. Chmait, MD

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