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Wild KT, Rintoul NE, Ades AM, Gebb JS, Moldenhauer JS, Mathew L, Flohr S, Bostwick A, Reynolds T, Ruiz RL, Javia LR, Nelson O, Peranteau WH, Partridge EA, Adzick NS, Hedrick HL. The Delivery Room Resuscitation of Infants with Congenital Diaphragmatic Hernia Treated with Fetoscopic Endoluminal Tracheal Occlusion: Beyond the Balloon. Fetal Diagn Ther 2024; 51:184-190. [PMID: 38198774 DOI: 10.1159/000536209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Accepted: 12/29/2023] [Indexed: 01/12/2024]
Abstract
INTRODUCTION Randomized controlled trials found that fetoscopic endoluminal tracheal occlusion (FETO) resulted in increased fetal lung volume and improved survival for infants with isolated, severe left-sided congenital diaphragmatic hernia (CDH). The delivery room resuscitation of these infants is particularly unique, and the specific delivery room events are largely unknown. The objective of this study was to compare the delivery room resuscitation of infants treated with FETO to standard of care (SOC) and describe lessons learned. METHODS Retrospective single-center cohort study of infants treated with FETO compared to infants who met FETO criteria during the same period but who received SOC. RESULTS FETO infants were more likely to be born prematurely with 8/12 infants born <35 weeks gestational age compared to 3/35 SOC infants. There were 5 infants who required emergent balloon removal (2 ex utero intrapartum treatment and 3 tracheoscopic removal on placental bypass with delayed cord clamping) and 7 with prenatal balloon removal. Surfactant was administered in 6/12 FETO (50%) infants compared to 2/35 (6%) in the SOC group. Extracorporeal membrane oxygenation use was lower at 25% and survival was higher at 92% compared to 60% and 71% in the SOC infants, respectively. CONCLUSION The delivery room resuscitation of infants treated with FETO requires thoughtful preparation with an experienced multidisciplinary team. Given increased survival, FETO should be offered to infants with severe isolated left-sided CDH, but only in high-volume centers with the experience and capability of removing the balloon, emergently if needed. The neonatal clinical team must be skilled in managing the unique postnatal physiology inherent to FETO where effective interdisciplinary teamwork is essential. Empiric and immediate surfactant administration should be considered in all FETO infants to lavage thick airway secretions, particularly those delivered <48 h after balloon removal.
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Affiliation(s)
- K Taylor Wild
- Division of Neonatology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Natalie E Rintoul
- Division of Neonatology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Anne M Ades
- Division of Neonatology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Juliana S Gebb
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Julie S Moldenhauer
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Leny Mathew
- Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Sabrina Flohr
- Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Anna Bostwick
- Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Tom Reynolds
- Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Ryan L Ruiz
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Otolaryngology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Luv R Javia
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Otolaryngology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Olivia Nelson
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - William H Peranteau
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Pediatric General, Thoracic, and Fetal Surgery, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Emily A Partridge
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Pediatric General, Thoracic, and Fetal Surgery, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - N Scott Adzick
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Pediatric General, Thoracic, and Fetal Surgery, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Holly L Hedrick
- Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Pediatric General, Thoracic, and Fetal Surgery, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
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Wild KT, Hedrick HL, Ades AM, Fraga MV, Avitabile CM, Gebb JS, Oliver ER, Coletti K, Kesler EM, Van Hoose KT, Panitch HB, Johng S, Ebbert RP, Herkert LM, Hoffman C, Ruble D, Flohr S, Reynolds T, Duran M, Foster A, Isserman RS, Partridge EA, Rintoul NE. Update on Management and Outcomes of Congenital Diaphragmatic Hernia. J Intensive Care Med 2023:8850666231212874. [PMID: 37933125 DOI: 10.1177/08850666231212874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2023]
Abstract
Infants with congenital diaphragmatic hernia (CDH) benefit from comprehensive multidisciplinary teams that have experience in caring for the unique and complex issues associated with CDH. Despite prenatal referral to specialized high-volume centers, advanced ventilation strategies and pulmonary hypertension management, and extracorporeal membrane oxygenation, mortality and morbidity remain high. These infants have unique and complex issues that begin in fetal and infant life, but persist through adulthood. Here we will review the literature and share our clinical care pathway for neonatal care and follow up. While many advances have occurred in the past few decades, our work is just beginning to continue to improve the mortality, but also importantly the morbidity of CDH.
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Affiliation(s)
- K Taylor Wild
- Division of Neonatology, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Holly L Hedrick
- Richard D. Wood Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, PA, USA
- Division of Pediatric General, Thoracic, and Fetal Surgery, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Anne M Ades
- Division of Neonatology, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Maria V Fraga
- Division of Neonatology, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Catherine M Avitabile
- Division of Cardiology, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Juliana S Gebb
- Richard D. Wood Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Edward R Oliver
- Department of Radiology, Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Kristen Coletti
- Division of Neonatology, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Erin M Kesler
- Division of Pediatric General, Thoracic, and Fetal Surgery, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - K Taylor Van Hoose
- Division of Pediatric General, Thoracic, and Fetal Surgery, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Howard B Panitch
- Division of Pulmonary and Sleep Medicine, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Sandy Johng
- Division of Neonatology, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Renee P Ebbert
- Division of Pediatric General, Thoracic, and Fetal Surgery, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Lisa M Herkert
- Division of Pediatric General, Thoracic, and Fetal Surgery, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Casey Hoffman
- Department of Child and Adolescent Psychiatry and Behavioral Sciences, The Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Deanna Ruble
- Richard D. Wood Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Sabrina Flohr
- Richard D. Wood Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Tom Reynolds
- Richard D. Wood Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Melissa Duran
- Division of Pediatric General, Thoracic, and Fetal Surgery, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Audrey Foster
- Department of Clinical Nutrition, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Rebecca S Isserman
- Division of Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Emily A Partridge
- Richard D. Wood Center for Fetal Diagnosis and Treatment, Children's Hospital of Philadelphia, Philadelphia, PA, USA
- Division of Pediatric General, Thoracic, and Fetal Surgery, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
| | - Natalie E Rintoul
- Division of Neonatology, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, PA, USA
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Janssen J, van Drongelen J, Daamen WF, Grutters JPC. Plugging membranes after fetoscopy in congenital diaphragmatic hernia: early cost-effectiveness analysis. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2023; 61:710-718. [PMID: 36647616 DOI: 10.1002/uog.26163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 12/02/2022] [Accepted: 01/09/2023] [Indexed: 06/03/2023]
Abstract
OBJECTIVES Fetal endoscopic tracheal occlusion (FETO) improves neonatal survival of fetuses with congenital diaphragmatic hernia (CDH). However, FETO also increases the risk of preterm prelabor rupture of membranes (PPROM) and preterm delivery (PTD), as fetal membrane defects after fetoscopy do not heal. To solve this issue, an advanced sealing plug for closing the membrane defect is being developed. Using early-stage health economic modeling, we aimed to estimate the potential value of this innovative plug in terms of costs and effects, and to determine the properties required for it to become cost-effective. METHODS Early-stage health economic modeling was applied to the case of performing FETO in women with a singleton pregnancy whose fetus is diagnosed prenatally with CDH. We simulated a cohort of patients using a state-transition model over a 45-year time horizon. In our best-case-scenario analysis, we compared the current-care strategy with the perfect-plug strategy, which reduces the risk of PPROM and PTD by 100%, to determine the maximum quality-adjusted life years (QALYs) gained and costs saved. Using threshold analysis, we determined the minimum percentage reduction in the risk of PPROM and PTD required for the plug to be considered cost-effective. The impact of model parameters on outcome was investigated using a sensitivity analysis. RESULTS Our model indicated that a perfect-plug strategy would yield on average an additional 1.94 QALYs at a cost decrease of €2554 per patient. These values were influenced strongly by the percentage of cases with early PTD (27-34 weeks). Threshold analysis showed that, for €500 per plug, the plug strategy needs a minimum percentage reduction of 1.83% in the risk of PPROM and PTD (i.e. reduction in the risk from 47.50% to 46.63% for PPROM and from 71.50% to 70.19% for PTD) to be cost-effective. CONCLUSIONS Our model-based approach showed clear potential of the plug strategy when applied in the context of FETO for CDH fetuses, as only a minor reduction in the risk of PPROM and PTD is needed for the plug to be cost-effective. Its value is expected to be even higher when used in conditions associated with a higher rate of early PTD. Continued investment in research and development of the plug strategy appears to provide value for money. © 2023 The Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.
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Affiliation(s)
- J Janssen
- Department for Health Evidence, Radboud University Medical Center, Radboud Institute for Health Sciences, Nijmegen, The Netherlands
| | - J van Drongelen
- Department of Obstetrics and Gynecology, Radboud University Medical Center, Radboud Institute for Health Sciences, Nijmegen, The Netherlands
| | - W F Daamen
- Department of Biochemistry, Radboud University Medical Center, Radboud Institute for Molecular Life Sciences, Nijmegen, The Netherlands
| | - J P C Grutters
- Department for Health Evidence, Radboud University Medical Center, Radboud Institute for Health Sciences, Nijmegen, The Netherlands
- Department of Operating Rooms, Radboud University Medical Center, Nijmegen, The Netherlands
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Danzer E, Rintoul NE, van Meurs KP, Deprest J. Prenatal management of congenital diaphragmatic hernia. Semin Fetal Neonatal Med 2022; 27:101406. [PMID: 36456433 DOI: 10.1016/j.siny.2022.101406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Recently, two randomized controlled, prospective trials, the Tracheal Occlusion to Accelerate Lung Growth (TOTAL) trials, reported the outcomes on fetal endoluminal tracheal occlusion (FETO) for isolated left congenital diaphragmatic hernia (CDH). FETO significantly improved outcomes for severe hypoplasia. The effect in moderate cases, where the balloon was inserted later in pregnancy, did not reach significance. In a pooled analysis investigating the effect of the heterogeneity of the treatment effect by the time point of occlusion and severity, the difference may be explained by a difference in the duration of occlusion. Nevertheless, FETO carries a significant risk of preterm birth. The primary objective of this review is to provide an overview of the rationale for fetal intervention in CDH and the results of the randomized trials. The secondary objective is to discuss the technical aspects of FETO. Finally, recent developments of potential alternative fetal approaches will be highlighted.
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Affiliation(s)
- Enrico Danzer
- Stanford University School of Medicine and Lucile Packard Children's Hospital, Division of Neonatal and Developmental Medicine, Palo Alto, CA, USA; Division of Pediatric Surgery, Memorial Sloan Kettering Cancer Center, Weill Cornell Medical College, New York, NY, USA.
| | - Natalie E Rintoul
- The Richard Wood Jr. Center for Fetal Diagnosis and Treatment and Division of Neonatology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Krisa P van Meurs
- Stanford University School of Medicine and Lucile Packard Children's Hospital, Division of Neonatal and Developmental Medicine, Palo Alto, CA, USA
| | - Jan Deprest
- Academic Department Development and Regeneration, Cluster Woman and Child, Biomedical Sciences, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium; Center for Surgical Technologies, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium; Department of Obstetrics and Gynecology, Fetal Medicine Unit, University Hospitals Leuven, Leuven, Belgium; Institute of Women's Health, University College London Hospitals, London, United Kingdom
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Russo F, Benachi A, Gratacos E, Zani A, Keijzer R, Partridge E, Sananes N, De Coppi P, Aertsen M, Nicolaides KH, Deprest J. Antenatal Management of Congenital Diaphragmatic Hernia: what's next ? Prenat Diagn 2022; 42:291-300. [PMID: 35199368 DOI: 10.1002/pd.6120] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 02/19/2022] [Accepted: 02/20/2022] [Indexed: 11/07/2022]
Abstract
Congenital diaphragmatic hernia (CDH) can be diagnosed in the prenatal period and its severity can be measured by fetal imaging. There is now level I evidence that, in selected cases, Fetoscopic Endoluminal Tracheal Occlusion (FETO) increases survival to discharge from the neonatal unit as well as the risk for prematurity. Both effects are dependent on the time point of tracheal occlusion. FETO may also lead to iatrogenic death when done in unexperienced centres. The implementation of the findings from our clinical studies, may also vary based on local conditions. These may be different in terms of available skill set, access to fetal therapy, as well as outcome based on local neonatal management. We encourage prior benchmarking of local outcomes with optimal postnatal management, based on large enough numbers and using identical criteria as in the recent trials. We propose to work further on prenatal prediction methods, and the improvement of fetal intervention. In this manuscript, we describe a research agenda from a fetal medicine perspective. This research should be in parallel with innovation in neonatal and pediatric (surgical) management of this condition. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Francesca Russo
- Department of Development and Regeneration, Cluster Woman and Child, KU Leuven and Clinical Department of Obstetrics and Gynaecology, UZ Leuven, Leuven, Belgium
| | - Alexandra Benachi
- Department of Obstetrics and Gynaecology, Hospital Antoine Béclère, Université Paris Saclay, Clamart, France
| | | | - Augusto Zani
- Division of General and Thoracic Surgery, The Hospital for Sick Children, Toronto and Department of Surgery, University of Toronto, Toronto, Ontario, Canada
| | - Richard Keijzer
- Department of Pediatric Surgery, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Emily Partridge
- Department of Pediatric Surgery, Children's Hospital of Philadelphia, PA, USA
| | - Nicolas Sananes
- Department Obstetrics and Gynaecology, University Hospitals Strasbourg, Strasbourg, France
| | | | - Michael Aertsen
- Department of Radiology, University Hospitals Leuven, Leuven, Belgium
| | | | - Jan Deprest
- Department of Development and Regeneration, Cluster Woman and Child, KU Leuven and Clinical Department of Obstetrics and Gynaecology, UZ Leuven, Leuven, Belgium.,Institute of Women's Health, University College London, London, United Kingdom
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Deprest J, Flake A. How should fetal surgery for congenital diaphragmatic hernia be implemented in the post-TOTAL trial era: a discussion . Prenat Diagn 2022; 42:301-309. [PMID: 35032132 DOI: 10.1002/pd.6091] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 01/08/2022] [Accepted: 01/10/2022] [Indexed: 11/07/2022]
Abstract
Following prenatal diagnosis of congenital diaphragmatic hernia, severity can be predicted based on the presence of associated abnormalities, and in isolated cases, on lung size and position of the liver. Severe hypoplasia is defined by a contralateral lung size < 25% on ultrasound; moderate hypoplasia is when that lung measures between 25 and 45% of the normal. In fetuses with predicted poor postnatal outcome a procedure that reverses pulmonary hypoplasia may be considered. In uncontrolled studies, fetoscopic endoluminal tracheal occlusion (FETO) improved neonatal outcome. Recently, two randomized controlled trials compared the neonatal and infant outcomes in fetuses with isolated CDH (www.totaltrial.eu). In severe cases, FETO was carried out at 27+0 -29+6 weeks' gestation (referred to as "early") and in moderate at 30+0 -31+6 weeks ("late"). Survival to discharge from the neonatal intensive care unit increased by 25% (95%-CI:+6 - +46; P=.0091) and 13% (-1 - +28; P=.059), in fetuses with severe and moderate cases, respectively. Following FETO gestational age at delivery was on average 3.2 (2.3-4.1) weeks earlier following early and 1.7 (1.1 - 2.3) following late FETO. Here the strengths and weaknesses of the TOTAL trials and their translation to the clinic are debated. Discussants are the lead for the trial (JD) and a colleague (AF) not involved. The discussant notes that the observed survival, both in treated and expectantly managed fetuses, was overall less than what is reported by some high volume centers, particularly in North America. Additional criticisms are the potential effects of prematurity on the long term, the inclusion of low-volume centers, and the potential of FETO for severe iatrogenic complications. Therefore results may not be generalizable. The discussants concluded that although FETO may have its value it remains a procedure with a high risk for prematurity and it can be lethal when the balloon cannot be removed prior to delivery. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Jan Deprest
- Department of Development and Regeneration, Cluster Woman and Child, KU Leuven and Clinical Department of Obstetrics and Gynaecology, UZ Leuven, Leuven, Belgium
| | - Alan Flake
- Department of Pediatric Surgery, Children's Hospital of Philadelphia, Philadelphia, PA, USA
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Deprest JA, Nicolaides KH, Benachi A, Gratacos E, Ryan G, Persico N, Sago H, Johnson A, Wielgoś M, Berg C, Van Calster B, Russo FM. Randomized Trial of Fetal Surgery for Severe Left Diaphragmatic Hernia. N Engl J Med 2021; 385:107-118. [PMID: 34106556 PMCID: PMC7613453 DOI: 10.1056/nejmoa2027030] [Citation(s) in RCA: 156] [Impact Index Per Article: 52.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND Observational studies have shown that fetoscopic endoluminal tracheal occlusion (FETO) has been associated with increased survival among infants with severe pulmonary hypoplasia due to isolated congenital diaphragmatic hernia on the left side, but data from randomized trials are lacking. METHODS In this open-label trial conducted at centers with experience in FETO and other types of prenatal surgery, we randomly assigned, in a 1:1 ratio, women carrying singleton fetuses with severe isolated congenital diaphragmatic hernia on the left side to FETO at 27 to 29 weeks of gestation or expectant care. Both treatments were followed by standardized postnatal care. The primary outcome was infant survival to discharge from the neonatal intensive care unit. We used a group-sequential design with five prespecified interim analyses for superiority, with a maximum sample size of 116 women. RESULTS The trial was stopped early for efficacy after the third interim analysis. In an intention-to-treat analysis that included 80 women, 40% of infants (16 of 40) in the FETO group survived to discharge, as compared with 15% (6 of 40) in the expectant care group (relative risk, 2.67; 95% confidence interval [CI], 1.22 to 6.11; two-sided P = 0.009). Survival to 6 months of age was identical to the survival to discharge (relative risk, 2.67; 95% CI, 1.22 to 6.11). The incidence of preterm, prelabor rupture of membranes was higher among women in the FETO group than among those in the expectant care group (47% vs. 11%; relative risk, 4.51; 95% CI, 1.83 to 11.9), as was the incidence of preterm birth (75% vs. 29%; relative risk, 2.59; 95% CI, 1.59 to 4.52). One neonatal death occurred after emergency delivery for placental laceration from fetoscopic balloon removal, and one neonatal death occurred because of failed balloon removal. In an analysis that included 11 additional participants with data that were available after the trial was stopped, survival to discharge was 36% among infants in the FETO group and 14% among those in the expectant care group (relative risk, 2.65; 95% CI, 1.21 to 6.09). CONCLUSIONS In fetuses with isolated severe congenital diaphragmatic hernia on the left side, FETO performed at 27 to 29 weeks of gestation resulted in a significant benefit over expectant care with respect to survival to discharge, and this benefit was sustained to 6 months of age. FETO increased the risks of preterm, prelabor rupture of membranes and preterm birth. (Funded by the European Commission and others; TOTAL ClinicalTrials.gov number, NCT01240057.).
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Affiliation(s)
- Jan A Deprest
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
| | - Kypros H Nicolaides
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
| | - Alexandra Benachi
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
| | - Eduard Gratacos
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
| | - Greg Ryan
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
| | - Nicola Persico
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
| | - Haruhiko Sago
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
| | - Anthony Johnson
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
| | - Mirosław Wielgoś
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
| | - Christoph Berg
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
| | - Ben Van Calster
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
| | - Francesca M Russo
- From the Department of Obstetrics and Gynecology, KU Leuven (J.A.D., F.M.R.) and Academic Department of Development and Regeneration, Biomedical Sciences, University Hospitals KU Leuven, Leuven, Belgium (J.A.D., B.V.C., F.M.R.); King's College Hospital (K.H.N.) and the Institute for Women's Health, University College London Hospital (J.A.D.) - both in London; Hospital Antoine-Béclère, Université Paris-Saclay, Clamart, France (A.B.); Hospital Clinic and Sant Joan de Déu, Barcelona (E.G.); Mount Sinai Hospital, Toronto (G.R.); Hospital Maggiore Policlinico, Milan (N.P.); the National Center for Child Health and Development, Tokyo (H.S.); Children's Memorial Hermann Hospital, Houston (A.J.); the Medical University of Warsaw, Warsaw, Poland (M.W.); and University Hospital Bonn, Bonn, Germany (C.B.)
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8
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Deprest J. Prenatal treatment of severe congenital diaphragmatic hernia: there is still medical equipoise. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2020; 56:493-497. [PMID: 33001496 DOI: 10.1002/uog.22182] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/08/2020] [Accepted: 06/26/2020] [Indexed: 06/11/2023]
Affiliation(s)
- J Deprest
- Clinical Department of Obstetrics and Gynaecology, University Hospitals Leuven, Leuven, Belgium
- Academic Department Development and Regeneration, Cluster Woman and Child, Biomedical Sciences, KU Leuven, Leuven, Belgium
- Institute for Woman's Health, University College London, London, UK
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9
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Basurto D, Russo FM, Van der Veeken L, Van der Merwe J, Hooper S, Benachi A, De Bie F, Gomez O, Deprest J. Prenatal diagnosis and management of congenital diaphragmatic hernia. Best Pract Res Clin Obstet Gynaecol 2019; 58:93-106. [PMID: 30772144 DOI: 10.1016/j.bpobgyn.2018.12.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 12/31/2018] [Indexed: 12/13/2022]
Abstract
Congenital diaphragmatic hernia is characterized by failed closure of the diaphragm, thereby allowing abdominal viscera to herniate into the thoracic cavity and subsequently interfering with normal lung development. At birth, pulmonary hypoplasia leads to respiratory insufficiency and persistent pulmonary hypertension (PHT), that is lethal in up to 32% of patients. In isolated cases, the outcome may be predicted prenatally by medical imaging and advanced genetic testing. In those fetuses with a predicted poor outcome, fetoscopic endoluminal tracheal occlusion may be offered. This procedure is currently being evaluated in a global randomized clinical trial (www.TOTALtrial.eu). We are currently investigating alternative strategies including transplacental sildenafil administration to reduce the occurrence of persistent PHT.
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Affiliation(s)
- David Basurto
- Academic Department of Development and Regeneration, Cluster Woman and Child, Biomedical Sciences, KU Leuven, Belgium
| | - Francesca Maria Russo
- Academic Department of Development and Regeneration, Cluster Woman and Child, Biomedical Sciences, KU Leuven, Belgium; Clinical Department of Obstetrics & Gynaecology, KU Leuven, Leuven, Belgium
| | - Lennart Van der Veeken
- Academic Department of Development and Regeneration, Cluster Woman and Child, Biomedical Sciences, KU Leuven, Belgium; Clinical Department of Obstetrics & Gynaecology, KU Leuven, Leuven, Belgium
| | - Johannes Van der Merwe
- Academic Department of Development and Regeneration, Cluster Woman and Child, Biomedical Sciences, KU Leuven, Belgium; Clinical Department of Obstetrics & Gynaecology, KU Leuven, Leuven, Belgium
| | - Stuart Hooper
- The Ritchie Centre, Hudson Institute of Medical Research and Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Alexandra Benachi
- Obstetrics and Gynaecology Department, Centre de Référence Maladie Rare: Hernie de Coupole Diaphragmatique, Hôpital Antoine Béclère, Université Paris Sud, AP-HP, Clamart, France; European Reference Network on Rare and Inherited Congenital Anomalies "ERNICA"
| | - Felix De Bie
- Academic Department of Development and Regeneration, Cluster Woman and Child, Biomedical Sciences, KU Leuven, Belgium
| | - Olga Gomez
- BCNatal, Barcelona Center for Maternal-Fetal and Neonatal Medicine (Hospital Clínic and Hospital Sant Joan de Deu), Fetal I+D Fetal Medicine Research Center, Institut Clinic de Ginecologia, Obstetricia I Neonatologia, IDIBAPS, CIBER-ER, University of Barcelona, Spain
| | - Jan Deprest
- Academic Department of Development and Regeneration, Cluster Woman and Child, Biomedical Sciences, KU Leuven, Belgium; Clinical Department of Obstetrics & Gynaecology, KU Leuven, Leuven, Belgium; Institute for Women's Health, University College London, London, UK; European Reference Network on Rare and Inherited Congenital Anomalies "ERNICA".
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10
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Abstract
In congenital diaphragmatic hernia (CDH), herniation of the abdominal organs into the fetal chest causes pulmonary hypoplasia and pulmonary hypertension, the main causes of neonatal mortality. As antenatal ultrasound screening improves, the risk of postnatal death can now be better predicted, allowing for the identification of fetuses that might most benefit from a prenatal intervention. Fetoscopic tracheal occlusion is being evaluated in a large international randomized controlled trial. We present the antenatal imaging approaches that can help identify fetuses that might benefit from antenatal therapy, and review the evolution of fetal surgery for CDH to date.
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Affiliation(s)
- Titilayo Oluyomi-Obi
- Section of Maternal Fetal Medicine, Department of Obstetrics and Gynaecology, University of Calgary, 1403 29 Street NW, Calgary, Alberta.
| | - Tim Van Mieghem
- Fetal Medicine Unit, Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada
| | - Greg Ryan
- Fetal Medicine Unit, Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada
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11
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Devlieger R, Riley SC, Verbist L, Leask R, Pijnenborg R, Deprest JA. Matrix Metalloproteinases-2 and -9 and Their Endogenous Tissue Inhibitors in Tissue Remodeling After Sealing of the Fetal Membranes in a Sheep Model of Fetoscopic Surgery. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/107155760200900304] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
| | | | | | | | - R. Pijnenborg
- Centre for Surgical Technologies and Department of Obstetrics and Gynecology, University Hospitals, Katholieke Universiteit Leuven, Leuven, Belgium; Obstetrics and Gynaecology Section, Department of Reproductive and Developmental Sciences, Centre for Reproductive Biology, University of Edinburgh, Edinburgh, United Kingdom
| | - J. A. Deprest
- Center for Surgical Technologies, Mindebroedersstraat 17, 3000-Leuven, Belgium
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12
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Deprest J, Brady P, Nicolaides K, Benachi A, Berg C, Vermeesch J, Gardener G, Gratacos E. Prenatal management of the fetus with isolated congenital diaphragmatic hernia in the era of the TOTAL trial. Semin Fetal Neonatal Med 2014; 19:338-48. [PMID: 25447987 DOI: 10.1016/j.siny.2014.09.006] [Citation(s) in RCA: 126] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Congenital diaphragmatic hernia (CDH) may be isolated or associated with other structural anomalies, the latter with poor prognosis. The defect allows viscera to herniate through the defect into the chest, competing for space with the developing lungs. At birth, pulmonary hypoplasia leads to respiratory insufficiency and persistent pulmonary hypertension that is lethal in up to 30% of patients. When isolated, survival chances can be predicted by antenatal measurement of lung size and liver herniation. Chromosomal microarrays and exome sequencing contribute to understanding genetic factors underlying isolated CDH. Prenatal intervention aims at stimulating lung development, clinically achieved by percutaneous fetal endoscopic tracheal occlusion (FETO) under local anesthesia. The Tracheal Occlusion To Accelerate Lung growth trial (www.totaltrial.eu) is an international randomized trial investigating the role of fetal therapy for severe and moderate pulmonary hypoplasia. Despite an apparent increase in survival following FETO, the search for lesser invasive and more potent prenatal interventions must continue.
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Affiliation(s)
- Jan Deprest
- Department of Obstetrics and Gynaecology, University Hospitals Leuven, and Academic Department of Development and Regeneration, Organ System Cluster, Leuven, Belgium; TOTAL Consortium (Tracheal Occlusion To Accelerate Lung Growth Trial).
| | - Paul Brady
- Department of Human Genetics, University Hospitals Leuven, Leuven, Belgium
| | - Kypros Nicolaides
- TOTAL Consortium (Tracheal Occlusion To Accelerate Lung Growth Trial); Harris Birthright Centre, King's College Hospital, London, UK
| | - Alexandra Benachi
- TOTAL Consortium (Tracheal Occlusion To Accelerate Lung Growth Trial); Department of Obstetrics, Gynaecology and Reproductive Medicine, Hôpital Antoine Beclere, University Paris Sud, Clamart, France
| | - Christoph Berg
- TOTAL Consortium (Tracheal Occlusion To Accelerate Lung Growth Trial); Division of Fetal Surgery, Department of Obstetrics and Prenatal Medicine, University of Bonn, and Department of Obstetrics and Gynecology, University of Cologne, Germany
| | - Joris Vermeesch
- Department of Human Genetics, University Hospitals Leuven, Leuven, Belgium
| | - Glenn Gardener
- Mater Health Services, Mater Research UQ, Brisbane, Australia
| | - Eduard Gratacos
- TOTAL Consortium (Tracheal Occlusion To Accelerate Lung Growth Trial); BCNatal - Barcelona Center for Maternal-Fetal and Neonatal Medicine (Hospital Clínic and Hospital Sant Joan de Déu), IDIBAPS, University of Barcelona, and Centre for Biomedical Research on Rare Diseases (CIBER-ER), Barcelona, Spain
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13
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Sananès N, Ruano R, Weingertner AS, Regnard P, Salmon Y, Kohler A, Miry C, Mager C, Guerra F, Schneider A, Becmeur F, Leroy J, Dimarcq JL, Debry C, Favre R. Experimental fetal endoscopic tracheal occlusion in rhesus and cynomolgus monkeys: nonhuman primate models. J Matern Fetal Neonatal Med 2014; 28:1822-7. [DOI: 10.3109/14767058.2014.969234] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Khan PA, Cloutier M, Piedboeuf B. Tracheal occlusion: A review of obstructing fetal lungs to make them grow and mature. AMERICAN JOURNAL OF MEDICAL GENETICS PART C-SEMINARS IN MEDICAL GENETICS 2007; 145C:125-38. [PMID: 17436297 DOI: 10.1002/ajmg.c.30127] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Fetal lung growth and functional differentiation are affected strongly by the extent that pulmonary tissue is distended (expanded) by liquid that naturally fills developing future airspaces. Methods that prevent normal egress of this lung fluid through the trachea magnify mechanical stretching of lung parenchymal cells, thereby promoting lung development. Indeed, experimental observations demonstrate that in utero tracheal occlusion (TO) performed on fetuses during the late canalicular-early saccular stage potently stimulates pulmonary growth and maturation. In this review, we present the four principle non-human animal models of TO/obstruction and discuss them in relation to their utility in elucidating lung development, in remedying congenital diaphragmatic hernia (CDH) as well as in investigating the stretching effects on growth and remodeling of the fine vasculature.
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Affiliation(s)
- Paul A Khan
- CRCHUL Medical Research Centre, Laval University, Québec, Canada
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