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Date H. Living-donor lobar lung transplantation. J Heart Lung Transplant 2024; 43:162-168. [PMID: 37704161 DOI: 10.1016/j.healun.2023.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 08/22/2023] [Accepted: 09/05/2023] [Indexed: 09/15/2023] Open
Abstract
Living-donor lobar lung transplantation (LDLLT) is indicated for critically ill patients who would not survive the waiting period in the case of severe brain-dead donor shortage. It is essential to confirm that potential donors are willing to donate without applying psychological pressure from others. In standard LDLLT, the right and left lower lobes donated by 2 healthy donors are implanted into the recipient under cardiopulmonary support. LDLLT can be applied to various lung diseases including restrictive, obstructive, infectious, and vascular lung diseases in both adult and pediatric patients if size matching is acceptable. Functional size matching by measuring donor pulmonary function and anatomical size matching by 3-dimensional computed tomography volumetry are very useful. When 2 donors with ideal size matching are not available, various transplant procedures, such as single lobe, segmental, recipient lobe-sparing, and inverted lobar transplants are valuable options. There seems to be immunological advantages in LDLLT as compared to cadaveric lung transplantation (CLT). Unilateral chronic allograft dysfunction is a unique manifestation after bilateral LDLLT, which may contribute to better prognosis. The growth of adult lung graft implanted into growing pediatric recipients is suggested by radiologic evaluation. Although only 2 lobes are implanted, postoperative pulmonary function is equivalent between LDLLT and CLT. The long-term outcome after LDLLT is similar to or better than that after CLT. The author has performed 164 LDLLTs resulting in 71.6% survival rate at 10 years. All living-donors returned to their previous life styles. Because of possible serious morbidity in donors, LDLLT should be applied only for critically ill patients.
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Affiliation(s)
- Hiroshi Date
- The Department of Thoracic Surgery, Kyoto University Graduate School of Medicine, Kyoto, Japan.
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Tanaka S, Nakajima D, Sakamoto R, Oguma T, Kawaguchi A, Ohsumi A, Ohata K, Ueda S, Yamagishi H, Kayawake H, Yutaka Y, Yamada Y, Hamaji M, Hamada S, Tanizawa K, Handa T, Suga T, Baba S, Hiramatsu H, Ikeda T, Date H. Outcome and growth of lobar graft after pediatric living-donor lobar lung transplantation. J Heart Lung Transplant 2022; 42:660-668. [PMID: 36585287 DOI: 10.1016/j.healun.2022.12.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 11/24/2022] [Accepted: 12/07/2022] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Living-donor lobar lung transplantation (LDLLT) remains a life-saving option for pediatric patients with respiratory failure. However, the long-term survival and post-transplant quality of adult lobar grafts transplanted into children are unknown. Therefore, this study aimed to evaluate the outcomes of pediatric LDLLT and post-transplant graft growth. METHODS We retrospectively reviewed the prospectively collected clinical data of 25 living-donor lung transplantations performed in 24 pediatric recipients aged ≤17 years. The annual pulmonary function test data and computed tomography scans of 12 recipients, followed up for >5 years without significant complications, were used to evaluate growth in height, graft function, and radiological changes. The Kaplan-Meier method and simple linear regression were performed for analysis. RESULTS Bilateral lower lobe transplantation was performed in 12 patients, unilateral lower lobe transplantation in 12, and bilateral middle lobe transplantation in 1. The median volumetric size matching at transplantation was 142% (range, 54%-457%). The 5- and 10-year overall survival rates were 87.7% and 75.1༅, respectively. Chronic lung allograft dysfunction occurred in 2 patients. During a median follow-up of 6 years, the median increases in height and vital capacity were 14.4% (range, 0.80%-43.5%) and 58.5% (range, 6.7%-322%), respectively. Graft weight was positively correlated with graft volume (r2=0.622, p<0.001) after the graft volume exceeded the original lobar volume in the donor. CONCLUSIONS This study shows that pediatric LDLLT offers satisfactory long-term survival, with the growth of mature adult lobes transplanted into growing children.
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Affiliation(s)
- Satona Tanaka
- Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan. https://twitter.com/https://twitter.com/t_satona
| | - Daisuke Nakajima
- Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Ryo Sakamoto
- Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Tsuyoshi Oguma
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Atsushi Kawaguchi
- Center for Comprehensive Community Medicine, Faculty of Medicine, Saga University, Saga, Japan
| | - Akihiro Ohsumi
- Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Keiji Ohata
- Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Satoshi Ueda
- Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Hiroya Yamagishi
- Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Hidenao Kayawake
- Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Yojiro Yutaka
- Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Yoshito Yamada
- Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Masatsugu Hamaji
- Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Satoshi Hamada
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Department of Advanced Medicine for Respiratory Failure, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kiminobu Tanizawa
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Tomohiro Handa
- Department of Respiratory Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Department of Advanced Medicine for Respiratory Failure, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Takenori Suga
- Department of Pediatrics, Kyoto University Hospital, Kyoto, Japan
| | - Shiro Baba
- Department of Pediatrics, Kyoto University Hospital, Kyoto, Japan
| | | | - Tadashi Ikeda
- Department of Cardiovascular Surgery, Kyoto University Hospital, Kyoto, Japan
| | - Hiroshi Date
- Department of Thoracic Surgery, Kyoto University Hospital, Kyoto, Japan.
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Moschino L, Bonadies L, Baraldi E. Lung growth and pulmonary function after prematurity and bronchopulmonary dysplasia. Pediatr Pulmonol 2021; 56:3499-3508. [PMID: 33729686 PMCID: PMC8597033 DOI: 10.1002/ppul.25380] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 02/23/2021] [Accepted: 03/10/2021] [Indexed: 12/19/2022]
Abstract
Bronchopulmonary dysplasia (BPD) still carries a heavy burden of morbidity and mortality in survivors of extreme prematurity. The disease is characterized by simplification of the alveolar structure, involving a smaller number of enlarged alveoli due to decreased septation and a dysmorphic pulmonary microvessel growth. These changes lead to persistent abnormalities mainly affecting the smaller airways, lung parenchyma, and pulmonary vasculature, which can be assessed with lung function tests and imaging techniques. Several longitudinal lung function studies have demonstrated that most preterm-born subjects with BPD embark on a low lung function trajectory, never achieving their full airway growth potential. They are consequently at higher risk of developing a chronic obstructive pulmonary disease-like phenotype later in life. Studies based on computer tomography and magnetic resonance imaging, have also shown that in these patients there is a persistence of lung abnormalities like emphysematous areas, bronchial wall thickening, interstitial opacities, and mosaic lung attenuation also in adult age. This review aims to outline the current knowledge of pulmonary and vascular growth in survivors of BPD and the evidence of their lung function and imaging up to adulthood.
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Affiliation(s)
- Laura Moschino
- Department of Women's and Children's Health, Neonatal Intensive Care Unit, Padova University Hospital, Padova, Italy
| | - Luca Bonadies
- Department of Women's and Children's Health, Neonatal Intensive Care Unit, Padova University Hospital, Padova, Italy
| | - Eugenio Baraldi
- Department of Women's and Children's Health, Neonatal Intensive Care Unit, Padova University Hospital, Padova, Italy.,Institute of Pediatric Research (IRP), Fondazione Città della Speranza, Padova, Italy
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Affiliation(s)
- Andrew Bush
- Imperial College and Royal Brompton Hospital, London, London, United Kingdom of Great Britain and Northern Ireland;
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Bandyopadhyay A, Slaven J, Evrard C, Tiller C, Haas D, Tepper RS. Antenatal corticosteriods decrease forced vital capacity in infants born fullterm. Pediatr Pulmonol 2020; 55:2630-2634. [PMID: 32618132 PMCID: PMC7722163 DOI: 10.1002/ppul.24941] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 06/09/2020] [Accepted: 06/24/2020] [Indexed: 11/10/2022]
Abstract
Antenatal corticosteroids (ACS) administration to pregnant women for threatened preterm labor is standard obstetric care to reduce neonatal respiratory distress syndrome and the associated respiratory morbidity. While ACS stimulates surfactant production in the fetal lung, the effects of ACS upon the subsequent growth and development of the lung are unclear. Follow-up studies outside of the neonatal period have been primarily limited to spirometry, and most subjects evaluated were born prematurely. To our knowledge, no study has assessed both airway and parenchymal function in infants or adults following ACS exposure. We hypothesized that ACS impairs lung growth and performed infant pulmonary function testing, which included spirometry, alveolar volume (VA ) and lung diffusion (DL ). As a pilot study, we limited our assessment to infants whose mothers received ACS for threatened preterm labor, but then proceeded to full term delivery. This approach evaluated a more homogenous population and eliminated the confounding effects of preterm birth. We evaluated 36 full-term infants between 4 to 12 months of age; 17 infants had ACS exposure and 19 infants had no ACS exposure. Infants exposed to ACS had a significantly lower forced vital capacity compared with non-ACS exposed infants (250 vs 313 mL; P = .0075). FEV0.5 tended to be lower for the ACS exposed group (205 vs 237 mL; P = .075). VA and DL did not differ between the two groups. These findings suggest that ACS may impair subsequent growth of the lung parenchyma.
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Affiliation(s)
- Anuja Bandyopadhyay
- Department of Pediatrics–Division of Pulmonology; Indiana University School of Medicine, Indianapolis, Indiana
| | - James.E. Slaven
- Department of Biostatistics; Indiana University School of Medicine, Indianapolis, Indiana
| | - Cindy Evrard
- Departments of Obstetrics and Gynecology; Indiana University School of Medicine, Indianapolis, Indiana
| | - Christina Tiller
- Department of Pediatrics–Division of Pulmonology; Indiana University School of Medicine, Indianapolis, Indiana
| | - David.M. Haas
- Departments of Obstetrics and Gynecology; Indiana University School of Medicine, Indianapolis, Indiana
| | - Robert S. Tepper
- Department of Pediatrics–Division of Pulmonology; Indiana University School of Medicine, Indianapolis, Indiana
- Herman Wells Center for Pediatric Research; Indiana University School of Medicine, Indianapolis, Indiana
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6
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Correani A, Dell'Orto V, Nobile S, Antognoli L, Marchionni P, Giretti I, Monachesi C, Rondina C, Palazzi ML, Biagetti C, D'Ascenzo R, Pompilio A, Simonato M, Cogo P, Burattini I, Carnielli VP. Oxygen saturation to fraction of inspired oxygen ratio in preterm infants on routine parenteral nutrition with conventional or fish oil containing lipid emulsions. Pediatr Pulmonol 2020; 55:2377-2382. [PMID: 32662932 DOI: 10.1002/ppul.24938] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 06/27/2020] [Indexed: 11/08/2022]
Abstract
INTRODUCTION The benefits of intravenous (IV) fish oil (FO), as a source of n-3 long-chain polyunsaturated fatty acids, on lung growth in preterm infants, remain controversial. AIM To evaluate if IV FO improves lung growth in small preterm infants on routine parenteral nutrition (PN). MATERIALS AND METHODS We retrospectively reviewed prospectively collected data of preterm infants with a birth weight <1250 g who received routine PN from birth. We compared patients who received FO containing IV lipid emulsions with infants who received conventional emulsions (CNTR). The oxygen saturation (SpO2 ) to a fraction of inspired oxygen (FiO2 ) ratio (SFR) at 36 weeks (W) of gestation was chosen as the primary outcome variable to assess lung growth. RESULTS Four hundred and seventy-seven infants were studied: 240 received IV FO and 237 CNTR. While exposure to antenatal glucocorticoids was higher in IV FO group than in CNTR (95 vs 90%, P = .04), there were no differences in birth data, enteral and parenteral nutrition intakes, ventilator supports and drug therapies. The incidence of the most common complications of prematurity at 36 W was not different (bronchopulmonary dysplasia was 27 vs 21% in IV FO vs CNTR infants, P = .1). Weight gain from birth to 36 W was marginally, but significantly, higher (+0.5 g/kg/d, P = .03) in IV FO group vs CNTR. SFR increased from 32 W to 36 W in all study patients (P < .001). IV FO infants had significantly lower SpO2 from 33 W to 35 W (P < .001) and lower (worse) SFR at 36 W (432 ± 57 vs 444 ± 51, P = .026) compared to CNTR. CONCLUSION Contrary to our hypothesis, the use of FO containing IV lipid emulsions for the routine PN of the preterm infant did not improve lung growth compared to the infants who received conventional IV lipid emulsions.
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Affiliation(s)
- Alessio Correani
- Department of Mother and Child Health, Division of Neonatology, Azienda Ospedaliero Universitaria Ospedali Riuniti di Ancona Umberto I, Ancona, Italy
| | - Valentina Dell'Orto
- Department of Mother and Child Health, Division of Neonatology, Azienda Ospedaliero Universitaria Ospedali Riuniti di Ancona Umberto I, Ancona, Italy
| | - Stefano Nobile
- Department of Mother and Child Health, Division of Neonatology, Azienda Ospedaliero Universitaria Ospedali Riuniti di Ancona Umberto I, Ancona, Italy
| | - Luca Antognoli
- Department of Odontostomatologic and Specialized Clinical Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Paolo Marchionni
- Department of Mother and Child Health, Division of Neonatology, Azienda Ospedaliero Universitaria Ospedali Riuniti di Ancona Umberto I, Ancona, Italy
| | - Ilaria Giretti
- Department of Odontostomatologic and Specialized Clinical Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Chiara Monachesi
- Department of Odontostomatologic and Specialized Clinical Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Clementina Rondina
- Department of Mother and Child Health, Division of Neonatology, Azienda Ospedaliero Universitaria Ospedali Riuniti di Ancona Umberto I, Ancona, Italy
| | - Maria Laura Palazzi
- Department of Mother and Child Health, Division of Neonatology, Azienda Ospedaliero Universitaria Ospedali Riuniti di Ancona Umberto I, Ancona, Italy
| | - Chiara Biagetti
- Department of Mother and Child Health, Division of Neonatology, Azienda Ospedaliero Universitaria Ospedali Riuniti di Ancona Umberto I, Ancona, Italy
| | - Rita D'Ascenzo
- Department of Mother and Child Health, Division of Neonatology, Azienda Ospedaliero Universitaria Ospedali Riuniti di Ancona Umberto I, Ancona, Italy
| | - Adriana Pompilio
- Department of Mother and Child Health, Division of Neonatology, Azienda Ospedaliero Universitaria Ospedali Riuniti di Ancona Umberto I, Ancona, Italy
| | - Manuela Simonato
- PCare Laboratory, Fondazione Istituto di Ricerca Pediatrica, "Città della Speranza", Padua, Italy
| | - Paola Cogo
- Department of Medicine, University of Udine, Udine, Italy
| | - Ilaria Burattini
- Department of Mother and Child Health, Division of Neonatology, Azienda Ospedaliero Universitaria Ospedali Riuniti di Ancona Umberto I, Ancona, Italy
| | - Virgilio P Carnielli
- Department of Mother and Child Health, Division of Neonatology, Azienda Ospedaliero Universitaria Ospedali Riuniti di Ancona Umberto I, Ancona, Italy.,Department of Odontostomatologic and Specialized Clinical Sciences, Polytechnic University of Marche, Ancona, Italy
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Krishnan S, Stearman RS, Zeng L, Fisher A, Mickler EA, Rodriguez BH, Simpson ER, Cook T, Slaven JE, Ivan M, Geraci MW, Lahm T, Tepper RS. Transcriptomic modifications in developmental cardiopulmonary adaptations to chronic hypoxia using a murine model of simulated high-altitude exposure. Am J Physiol Lung Cell Mol Physiol 2020; 319:L456-L470. [PMID: 32639867 DOI: 10.1152/ajplung.00487.2019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Mechanisms driving adaptive developmental responses to chronic high-altitude (HA) exposure are incompletely known. We developed a novel rat model mimicking the human condition of cardiopulmonary adaptation to HA starting at conception and spanning the in utero and postnatal timeframe. We assessed lung growth and cardiopulmonary structure and function and performed transcriptome analyses to identify mechanisms facilitating developmental adaptations to chronic hypoxia. To generate the model, breeding pairs of Sprague-Dawley rats were exposed to hypobaric hypoxia (equivalent to 9,000 ft elevation). Mating, pregnancy, and delivery occurred in hypoxic conditions. Six weeks postpartum, structural and functional data were collected in the offspring. RNA-Seq was performed on right ventricle (RV) and lung tissue. Age-matched breeding pairs and offspring under room air (RA) conditions served as controls. Hypoxic rats exhibited significantly lower body weights and higher hematocrit levels, alveolar volumes, pulmonary diffusion capacities, RV mass, and RV systolic pressure, as well as increased pulmonary artery remodeling. RNA-Seq analyses revealed multiple differentially expressed genes in lungs and RVs from hypoxic rats. Although there was considerable similarity between hypoxic lungs and RVs compared with RA controls, several upstream regulators unique to lung or RV were identified. We noted a pattern of immune downregulation and regulation patterns of immune and hormonal mediators similar to the genome from patients with pulmonary arterial hypertension. In summary, we developed a novel murine model of chronic hypoxia exposure that demonstrates functional and structural phenotypes similar to human adaptation. We identified transcriptomic alterations that suggest potential mechanisms for adaptation to chronic HA.
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Affiliation(s)
- Sheila Krishnan
- Department of Medicine, Division of Pulmonary, Critical Care, Sleep and Occupational Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Robert S Stearman
- Department of Medicine, Division of Pulmonary, Critical Care, Sleep and Occupational Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Lily Zeng
- Department of Medicine, Division of Pulmonary, Critical Care, Sleep and Occupational Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Amanda Fisher
- Department of Anesthesiology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Elizabeth A Mickler
- Department of Medicine, Division of Pulmonary, Critical Care, Sleep and Occupational Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Brooke H Rodriguez
- Department of Medicine, Division of Pulmonary, Critical Care, Sleep and Occupational Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Edward R Simpson
- Department of BioHealth Informatics, School of Informatics and Computing, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana.,Center for Computational Biology and Bioinformatics, Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana
| | - Todd Cook
- Indiana Center for Vascular Biology and Medicine, Indianapolis, Indiana
| | - James E Slaven
- Department of Biostatistics, Indiana University School of Medicine, Indianapolis, Indiana.,Department of Medicine, Division of Hematology and Oncology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Mircea Ivan
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Mark W Geraci
- Department of Medicine, Division of Pulmonary, Critical Care, Sleep and Occupational Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Tim Lahm
- Department of Medicine, Division of Pulmonary, Critical Care, Sleep and Occupational Medicine, Indiana University School of Medicine, Indianapolis, Indiana.,Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana.,Richard L. Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana
| | - Robert S Tepper
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana
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Abstract
Asthma-like symptoms like wheezing and dyspnea affect 1 in every 3 preschool children. An easily available biomarker that predicts later asthma or unfavorable lung growth in these children may be helpful in targeting the right child with the right drugs and avoiding exposure to potentially harmful drugs in others. The fraction of exhaled nitric oxide (FeNO) has been suggested as a marker of eosinophilic inflammation. FeNO can be measured in a standardized way from the age of 4 but several methods have been developed to measure FeNO also in younger children. Several studies have assessed the predictive value of FeNO in preschool wheezing children for asthma later in life. These studies have shown that FeNO may be helpful in defining different preschool wheezing phenotypes, and in assessing the risk of later asthma or impaired lung growth. However, data are conflicting on the added value over clinical parameters. In two studies in school children, high FeNO was predictive for asthma development during follow up and also predicted lower lung function growth. In school children with respiratory symptoms suggestive of asthma, particularly in atopic children, FeNO has diagnostic value for an asthma diagnosis, mostly for ruling in asthma. There are not enough data to assess if FeNO has a predictive value for lung development in school children.
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Affiliation(s)
- Mariëlle W Pijnenburg
- Division of Respiratory Medicine and Allergology, Department of Pediatrics, Erasmus MC-Sophia, University Medical Center Rotterdam, Rotterdam, Netherlands
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Abstract
OBJECTIVES We sought to investigate pulmonary hypoplasia (PH) and associated risk factors in fetuses with congenital conotruncal defect (CTD). METHODS A total of 75 fetuses with CTD (gestational age (GA): 22-32 weeks) and 150 normal GA-matched fetuses as the control group were studied. We measured diameters of aorta (Ao); main, left, and right pulmonary artery (PA); and their Z-scores by fetal echocardiography (FE). We also measured the lung area, lung area/chest area ratio (LCR), lung-to-head circumference ratio (LHR), right lung area/head circumference2 (quantitative lung index, QLI), and Z-scores. RESULTS The PA, left pulmonary artery (LPA), RPA, and their Z-scores and the lung area measurements (except for QLI) were significantly smaller in the CTD group, compared with the normal control group. Subgroup analysis showed the following: (1) CTD with right ventricular outflow tract obstruction (RVOTO) had smaller main and branch PA dimensions and small lung areas in contrast to CTD without RVOTO. (2) CTD with pulmonary atresia had smaller LPA and RPA dimensions but no difference in lung areas. (3) In the common types of CTD, lung area variables were mostly smaller in double outlet right ventricle (DORV) and tetralogy of Fallot (TOF), but there was no difference in transposition of the great arteries (TGA). CONCLUSIONS CTD is associated with hypoplastic main and branch pulmonary arteries as well as PH. Risk factors for PH included defect types (DORV and TOF but not TGA) and RVOTO. It is plausible that pulmonary blood flow, rather than the type of CTD, RVOTO, or pulmonary artery dimensions, plays a key role in PH.
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Affiliation(s)
- Qian Wang
- Beijing Key Laboratory of Maternal-Fetal Medicine and Fetal Heart Disease, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Ying Zhao
- Beijing Key Laboratory of Maternal-Fetal Medicine and Fetal Heart Disease, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Ling Han
- Beijing Key Laboratory of Maternal-Fetal Medicine and Fetal Heart Disease, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Ye Zhang
- Beijing Key Laboratory of Maternal-Fetal Medicine and Fetal Heart Disease, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Shuping Ge
- The Heart Center, St. Christopher's Hospital for Children and Drexel University College of Medicine, Philadelphia, PA, USA
| | - Yihua He
- Beijing Key Laboratory of Maternal-Fetal Medicine and Fetal Heart Disease, Beijing Anzhen Hospital, Capital Medical University, Beijing, China
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Bovard JM, Welch JF, Houghton KM, McKenzie DC, Potts JE, Sheel AW. Does competitive swimming affect lung growth? Physiol Rep 2018; 6:e13816. [PMID: 30084226 PMCID: PMC6079116 DOI: 10.14814/phy2.13816] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Revised: 07/04/2018] [Accepted: 07/06/2018] [Indexed: 12/19/2022] Open
Abstract
Whether the large lungs of swimmers result from intensive training or genetic endowment has been widely debated. Given that peak lung growth velocities occur during puberty, this study examined if competitive swimming during puberty affected lung growth. Eleven- to fourteen-year-old healthy female competitive swimmers and controls were assessed before (PRE) and after (POST) one swimming season (7.4 ± 0.5 months). Pulmonary function testing included lung volumes, spirometry, diffusion capacity (DL,CO ), and maximal inspiratory (PIMAX ) and expiratory (PEMAX ) pressures. Ventilatory constraints, including end-expiratory lung volume, expiratory flow limitation, and utilization of ventilatory capacity, were assessed during an incremental cycling test. Swimmers (n = 11) and controls (n = 10) were of similar age, size, and sexual maturity (P > 0.05). However, swimmers compared to controls had a greater total lung capacity (PRE 4.73 ± 0.73 vs. 3.93 ± 0.46, POST 5.08 ± 0.68 vs. 4.19 ± 0.64 L; P < 0.01), peak expiratory flow (PRE 6.48 ± 0.92 vs. 5.70 ± 0.86, POST 6.97 ± 0.84 vs. 6.00 ± 0.77 L·s-1 ; P = 0.03), and PEMAX (P < 0.001). Although DL,CO was greater in swimmers (P = 0.01), differences were attenuated when expressed relative to alveolar volume (PRE 5.14 ± 0.60 vs. 5.44 ± 0.44, POST 4.91 ± 0.56 vs. 5.16 ± 0.38 mL min-1 mmHg-1 L-1 ; P = 0.20). The groups achieved a similar maximal oxygen uptake (P = 0.32), and ventilatory constraints experienced were not different (P > 0.05). Changes over time were not different between groups (P > 0.05). At the initial measurement, pubertal female swimmers had greater lung size, expiratory flows, and indices of respiratory muscle strength, but similar ventilatory constraints while cycling. One competitive swimming season did not further accentuate this enhanced lung size and function or alter ventilatory mechanics, suggesting that competitive swimming during puberty did not affect lung growth.
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Affiliation(s)
- Joshua M. Bovard
- School of KinesiologyUniversity of British ColumbiaVancouverCanada
| | - Joseph F. Welch
- School of KinesiologyUniversity of British ColumbiaVancouverCanada
| | - Kristin M. Houghton
- Division of PediatricsFaculty of MedicineUniversity of British ColumbiaVancouverCanada
| | - Donald C. McKenzie
- School of KinesiologyUniversity of British ColumbiaVancouverCanada
- Division of Sports MedicineFaculty of MedicineUniversity of British ColumbiaVancouverCanada
| | - James E. Potts
- Division of PediatricsFaculty of MedicineUniversity of British ColumbiaVancouverCanada
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11
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Yamamoto Y, Hirose A, Howley L, Savard W, Jain V, Hornberger LK. Parameters of fetal pulmonary vascular health: baseline trends and response to maternal hyperoxia in the second and third trimesters. Ultrasound Obstet Gynecol 2017; 50:618-623. [PMID: 27943455 DOI: 10.1002/uog.17383] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 10/20/2016] [Accepted: 12/01/2016] [Indexed: 06/06/2023]
Abstract
OBJECTIVES Several parameters, including branch pulmonary artery (PA) diameter and Doppler-derived PA acceleration-to-ejection time ratio (AT/ET), peak late-systolic/early-diastolic reversed flow (PEDRF) and pulsatility index (PI) response to maternal hyperoxia, have been used to investigate fetal pulmonary health. Lower AT/ET, increased PEDRF and lack of PI response to hyperoxia have been observed in fetuses with severe lung hypoplasia and are considered markers of pulmonary vascular resistance. We sought to further define the evolution of PA diameter and Doppler parameters and their response to maternal hyperoxia in healthy fetuses. METHODS Fifty-four prospectively recruited women with healthy pregnancy underwent fetal echocardiography from 18-36 weeks of gestation. After baseline branch PA diameter and Doppler assessment, oxygen (8-10 L/min) was administered by non-reservoir facemask for 10 min and PA Doppler parameters were reassessed. RESULTS Branch PA diameters and AT/ET increased linearly with gestational age, while PEDRF increased quadratically (P < 0.001 for all) and PA-PI did not change. In response to maternal hyperoxia, although most fetuses demonstrated a significant decrease in PI for both branch PAs (right PA, P = 0.025; left PA, P = 0.040) ≥ 30 weeks, significant variability was observed in PI response with 31% of cases demonstrating either no response or a slight decrease. No other parameter demonstrated a measurable change in response to maternal hyperoxia. CONCLUSIONS From the mid-trimester, fetal branch PA diameters and AT/ET increase linearly and PEDRF increases quadratically, whereas PI remains unchanged. Although maternal hyperoxia triggers a significant decrease in PA-PI after 30 weeks, variability in this response may reduce its utility in clinical practice. Copyright © 2016 ISUOG. Published by John Wiley & Sons Ltd.
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Affiliation(s)
- Y Yamamoto
- Fetal and Neonatal Cardiology Program, Department of Pediatrics, Division of Cardiology, Women's & Children's Health Research Institute and Mazankowski Heart Institute, University of Alberta, Edmonton, Alberta, Canada
| | - A Hirose
- Fetal and Neonatal Cardiology Program, Department of Pediatrics, Division of Cardiology, Women's & Children's Health Research Institute and Mazankowski Heart Institute, University of Alberta, Edmonton, Alberta, Canada
| | - L Howley
- Fetal and Neonatal Cardiology Program, Department of Pediatrics, Division of Cardiology, Women's & Children's Health Research Institute and Mazankowski Heart Institute, University of Alberta, Edmonton, Alberta, Canada
| | - W Savard
- Fetal and Neonatal Cardiology Program, Department of Pediatrics, Division of Cardiology, Women's & Children's Health Research Institute and Mazankowski Heart Institute, University of Alberta, Edmonton, Alberta, Canada
| | - V Jain
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada
| | - L K Hornberger
- Fetal and Neonatal Cardiology Program, Department of Pediatrics, Division of Cardiology, Women's & Children's Health Research Institute and Mazankowski Heart Institute, University of Alberta, Edmonton, Alberta, Canada
- Department of Obstetrics and Gynecology, University of Alberta, Edmonton, Alberta, Canada
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12
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Glénet S, de Bisschop C, Delcambre F, Thiébaut R, Laurent F, Jougon J, Velly JF, Georges A, Guénard H. No compensatory lung growth after resection in a one-year follow-up cohort of patients with lung cancer. J Thorac Dis 2017; 9:3938-3945. [PMID: 29268404 DOI: 10.21037/jtd.2017.08.135] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Background As compensatory lung growth after lung resection has been studied in animals of various ages and in one case report in a young adult, it has not been studied in a cohort of adults operated for lung cancer. Methods A prospective study including patients with lung cancer was conducted over two years. Parenchymal mass was calculated using computed tomography before (M0) and at 3 and 12 months (M3 and M12) after surgery. Respiratory function was estimated by plethysmography and CO/NO lung transfer (DLCO and DLNO). Pulmonary capillary blood volume (Vc) and membrane conductance for CO (DmCO) were calculated. Insulin-like growth factor-1 (IGF-1) and insulin-like growth factor binding protein-3 (IGFBP-3) plasma concentrations were measured simultaneously. Results Forty-nine patients underwent a pneumonectomy (N=12) or a lobectomy (N=37) thirty two completed the protocol. Among all patients, from M3 to M12 the masses of the operated lungs (239±58 to 238±72 g in the lobectomy group) and of the non-operated lungs (393±84 to 377±68 g) did not change. Adjusted by the alveolar volume (VA), DLNO/VA decreased transiently by 7% at M3, returning towards the M0 value at M12. Both Vc and DmCO increased slightly between M3 and M12. IGF-1 and IGFBP-3 concentrations did not change at M3, IGF-1 decreased significantly from M3 to M12. Conclusions Compensatory lung growth did not occur over one year after lung surgery. The lung function data could suggest a slight recruitment or distension of capillaries owing to the likely hemodynamic alterations. An angiogenesis process is unlikely.
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Affiliation(s)
- Stéphane Glénet
- Laboratoire de Physiologie, Université Victor Segalen Bordeaux and Lung Testing Laboratory CHU de Bordeaux, France
| | | | - Frédéric Delcambre
- Service de chirurgie thoracique, hôpital du Haut Lévêque, F-33600 Pessac, France
| | | | - François Laurent
- Service d'imagerie thoracique, hôpital du Haut Lévêque, F-33600 Pessac, France
| | - Jacques Jougon
- Service de chirurgie thoracique, hôpital du Haut Lévêque, F-33600 Pessac, France
| | - Jean-François Velly
- Service de chirurgie thoracique, hôpital du Haut Lévêque, F-33600 Pessac, France
| | - Agnès Georges
- Service de médecine nucléaire, hôpital du Haut Lévêque, F-33600 Pessac, France
| | - Hervé Guénard
- Laboratoire de Physiologie, Université Victor Segalen Bordeaux and Lung Testing Laboratory CHU de Bordeaux, France
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13
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Marwan AI, Shabeka U, Dobrinskikh E. Suggested Mechanisms of Tracheal Occlusion Mediated Accelerated Fetal Lung Growth: A Case for Heterogeneous Topological Zones. Front Pediatr 2017; 5:295. [PMID: 29376042 PMCID: PMC5770375 DOI: 10.3389/fped.2017.00295] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Accepted: 12/21/2017] [Indexed: 12/17/2022] Open
Abstract
In this article, we report an up-to-date summary on tracheal occlusion (TO) as an approach to drive accelerated lung growth and strive to review the different maternal- and fetal-derived local and systemic signals and mechanisms that may play a significant biological role in lung growth and formation of heterogeneous topological zones following TO. Pulmonary hypoplasia is a condition whereby branching morphogenesis and embryonic pulmonary vascular development are globally affected and is classically seen in congenital diaphragmatic hernia. TO is an innovative approach aimed at driving accelerated lung growth in the most severe forms of diaphragmatic hernia and has been shown to result in improved neonatal outcomes. Currently, most research on mechanisms of TO-induced lung growth is focused on mechanical forces and is viewed from the perspective of homogeneous changes within the lung. We suggest that the key principle in understanding changes in fetal lungs after TO is taking into account formation of unique variable topological zones. Following TO, fetal lungs might temporarily look like a dynamically changing topologic mosaic with varying proliferation rates, dissimilar scale of vasculogenesis, diverse patterns of lung tissue damage, variable metabolic landscape, and different structures. The reasons for this dynamic topological mosaic pattern may include distinct degree of increased hydrostatic pressure in different parts of the lung, dissimilar degree of tissue stress/damage and responses to this damage, and incomparable patterns of altered lung zones with variable response to systemic maternal and fetal factors, among others. The local interaction between these factors and their accompanying processes in addition to the potential role of other systemic factors might lead to formation of a common vector of biological response unique to each zone. The study of the interaction between various networks formed after TO (action of mechanical forces, activation of mucosal mast cells, production and secretion of damage-associated molecular pattern substances, low-grade local pulmonary inflammation, and cardiac contraction-induced periodic agitation of lung tissue, among others) will bring us closer to an appreciation of the biological phenomenon of topological heterogeneity within the fetal lungs.
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Affiliation(s)
- Ahmed I Marwan
- Division of Pediatric Surgery, Department of Surgery, University of Colorado Denver School of Medicine, Denver, CO, United States
| | - Uladzimir Shabeka
- Division of Pediatric Surgery, Department of Surgery, University of Colorado Denver School of Medicine, Denver, CO, United States
| | - Evgenia Dobrinskikh
- Department of Medicine, University of Colorado Denver School of Medicine, Denver, CO, United States
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14
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Chang DV, Assaf SJ, Tiller CJ, Kisling JA, Tepper RS. Membrane and Capillary Components of Lung Diffusion in Infants with Bronchopulmonary Dysplasia. Am J Respir Crit Care Med 2016; 193:767-71. [PMID: 26566056 DOI: 10.1164/rccm.201506-1219oc] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE Autopsied lungs of infants with bronchopulmonary dysplasia (BPD) demonstrate impaired alveolar development with larger and fewer alveoli, which is consistent with our previous physiologic findings of lower pulmonary diffusing capacity of the lung for carbon monoxide (DL(CO)) in infants and toddlers with BPD compared with healthy controls born at full term (FT). However, it is not known whether the decreased DL(CO) in infants with BPD results from a reduction in both components of DL(CO): pulmonary membrane diffusing capacity (D(M)) and Vc. OBJECTIVES We hypothesized that impairment of alveolar development in BPD results in a decrease in both D(M) and Vc components of DlCO but that the D(M)/Vc ratio would not differ between the BPD and FT groups. METHODS DL(CO) was measured under conditions of room air and high inspired oxygen (90%), which enabled D(M) and Vc to be calculated. MEASUREMENTS AND MAIN RESULTS D(M) and Vc increased with increasing body length; however, infants with BPD had significantly lower D(M) and Vc than FT subjects after adjustment for race, sex, body length, and corrected age. In contrast to D(M) and Vc, the D(M)/Vc ratio remained constant with increasing body length and did not differ for infants with BPD and FT subjects. CONCLUSIONS Our findings are consistent with infants with BPD having impaired alveolar development with fewer but larger alveoli, as well as a reduced Vc.
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Affiliation(s)
- Daniel V Chang
- Department of Pediatric Pulmonology, James Whitcomb Riley Hospital for Children at Indiana University, Indianapolis, Indiana
| | - Santiago J Assaf
- Department of Pediatric Pulmonology, James Whitcomb Riley Hospital for Children at Indiana University, Indianapolis, Indiana
| | - Christina J Tiller
- Department of Pediatric Pulmonology, James Whitcomb Riley Hospital for Children at Indiana University, Indianapolis, Indiana
| | - Jeffrey A Kisling
- Department of Pediatric Pulmonology, James Whitcomb Riley Hospital for Children at Indiana University, Indianapolis, Indiana
| | - Robert S Tepper
- Department of Pediatric Pulmonology, James Whitcomb Riley Hospital for Children at Indiana University, Indianapolis, Indiana
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15
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Assaf SJ, Chang DV, Tiller CJ, Kisling JA, Case J, Mund JA, Slaven JE, Yu Z, Ahlfeld SK, Poindexter B, Haneline LS, Ingram DA, Tepper RS. Lung parenchymal development in premature infants without bronchopulmonary dysplasia. Pediatr Pulmonol 2015; 50:1313-9. [PMID: 25462113 PMCID: PMC4452454 DOI: 10.1002/ppul.23134] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Revised: 07/10/2014] [Accepted: 08/17/2014] [Indexed: 12/20/2022]
Abstract
RATIONALE While infants who are born extremely premature and develop bronchopulmonary dysplasia (BPD) have impaired alveolar development and decreased pulmonary diffusion (DLCO), it remains unclear whether infants born less premature and do not develop BPD, healthy premature (HP), have impaired parenchymal development. In addition, there is increasing evidence that pro-angiogenic cells are important for vascular development; however, there is little information on the relationship of pro-angiogenic cells to lung growth and development in infants. OBJECTIVE and Methods Determine among healthy premature (HP) and fullterm (FT) infants, whether DLCO and alveolar volume (VA) are related to gestational age at birth (GA), respiratory support during the neonatal period (mechanical ventilation [MV], supplemental oxygen [O2], continuous positive airway pressure [CPAP]), and pro-angiogenic circulating hematopoietic stem/progenitor cells (CHSPCs). We measured DLCO, VA, and CHSPCs in infants between 3-33 months corrected-ages; HP (mean GA = 31.7 wks; N = 48,) and FT (mean GA = 39.3 wks; N =88). RESULT DLCO was significantly higher in HP than FT subjects, while there was no difference in VA , after adjusting for body length, gender, and race. DLCO and VA were not associated with GA, MV and O2; however, higher values were associated with higher CHSPCs, as well as treatment with CPAP. CONCLUSION Our findings suggest that in the absence of extreme premature birth, as well as BPD, prematurity per se, does not impair lung parenchymal development.
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Affiliation(s)
- Santiago J Assaf
- James Whitcomb Riley Hospital for Children Department of Pediatrics, Sections of Pulmonology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Daniel V Chang
- James Whitcomb Riley Hospital for Children Department of Pediatrics, Sections of Pulmonology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Christina J Tiller
- James Whitcomb Riley Hospital for Children Department of Pediatrics, Sections of Pulmonology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Jeffrey A Kisling
- James Whitcomb Riley Hospital for Children Department of Pediatrics, Sections of Pulmonology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Jamie Case
- James Whitcomb Riley Hospital for Children Department of Pediatrics, Section of Neonatology, Indiana University School of Medicine, Indianapolis, Indiana.,James Whitcomb Riley Hospital for Children Department of Pediatrics, Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana.,Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana
| | - Julie A Mund
- James Whitcomb Riley Hospital for Children Department of Pediatrics, Section of Neonatology, Indiana University School of Medicine, Indianapolis, Indiana.,James Whitcomb Riley Hospital for Children Department of Pediatrics, Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana.,Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana
| | - James E Slaven
- Department of Biostatistics, Indiana University School of Medicine, Indianapolis, Indiana
| | - Zhangsheng Yu
- Department of Biostatistics, Indiana University School of Medicine, Indianapolis, Indiana
| | - Shawn K Ahlfeld
- James Whitcomb Riley Hospital for Children Department of Pediatrics, Section of Neonatology, Indiana University School of Medicine, Indianapolis, Indiana.,Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana
| | - Brenda Poindexter
- James Whitcomb Riley Hospital for Children Department of Pediatrics, Section of Neonatology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Laura S Haneline
- James Whitcomb Riley Hospital for Children Department of Pediatrics, Section of Neonatology, Indiana University School of Medicine, Indianapolis, Indiana.,James Whitcomb Riley Hospital for Children Department of Pediatrics, Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana.,Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana.,Departments of Microbiology and Immunology and Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana
| | - David A Ingram
- James Whitcomb Riley Hospital for Children Department of Pediatrics, Section of Neonatology, Indiana University School of Medicine, Indianapolis, Indiana.,Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana.,Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana
| | - Robert S Tepper
- James Whitcomb Riley Hospital for Children Department of Pediatrics, Sections of Pulmonology, Indiana University School of Medicine, Indianapolis, Indiana.,Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana
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16
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De Paepe ME, Shapiro S, Hansen K, Gündoğan F. Postmortem lung volume/body weight standards for term and preterm infants. Pediatr Pulmonol 2014; 49:60-6. [PMID: 24039222 DOI: 10.1002/ppul.22818] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 04/06/2013] [Indexed: 11/06/2022]
Abstract
Assessment of lung growth is a critical component of the perinatal autopsy. Increased lung liquid content may lead to overestimation of lung growth based on (wet) lung weight. In contrast, lung volume is not influenced by intraalveolar lung liquid. Our aim was to establish age-specific reference values for postmortem lung volume/BW in preterm and term infants. We performed a retrospective analysis of fetuses/infants (16-41 weeks' gestation) without (N = 134) or with (N = 79) risk factors for pulmonary hypoplasia. Lungs were inflated at standardized pressure and volumes determined by water immersion method. Lung volume increased 11-fold between 16 and 41 weeks' gestation, concomitant with a 16-fold increase in BW. Mean lung volume/BW remained constant at 33-34 ml/kg between 16 and 31 weeks' gestation and decreased to 23.4 ml/kg at term. Lung volume/BW of infants with severe risk factors (renal anomalies, diaphragmatic hernia) was significantly lower than age-matched standards. In this group, all fetuses/infants diagnosed as having lung hypoplasia by lung volume/BW also had lung hypoplasia LW/BW standards. However, in infants with "softer" risk factors (rupture of membranes, chromosomal anomalies), 5/26 cases diagnosed with lung hypoplasia based on lung volume/BW had normal LW/BW ratios. In these discrepant cases, lung sections showed significant inflammation and edema, likely accounting for increased wet lung weight. In conclusion, we determined age-specific lung volume/BW reference values for preterm and term infants. In selected situations assessment of lung volume/BW may represent a useful complementary tool to LW/BW for postmortem evaluation of lung size.
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Affiliation(s)
- Monique E De Paepe
- Department of Pathology, Alpert Medical School of Brown University, Providence, Rhode Island; Department of Pathology and Laboratory Medicine, Women and Infants Hospital, Alpert Medical School of Brown University, Providence, Rhode Island
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17
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Brown LM, Rannels SR, Rannels DE. Implications of post-pneumonectomy compensatory lung growth in pulmonary physiology and disease. Respir Res 2001; 2:340-7. [PMID: 11737933 PMCID: PMC64801 DOI: 10.1186/rr84] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2001] [Revised: 07/06/2001] [Accepted: 07/25/2001] [Indexed: 11/26/2022] Open
Abstract
In a number of species, partial pneumonectomy initiates hormonally regulated compensatory growth of the remaining lung lobes that restores normal mass, structure and function. Compensation is qualitatively similar across species, but differs with gender, age and hormonal status. Although the biology of response is best characterized in rats, dogs have proven valuable in defining post-operative physiological adaptations. Most recently, mice were recognized to offer unique opportunities to explore the genetic basis of the response, as well as to evaluate associated detrimental effects of pathophysiological significance in animals exposed to carcinogens. The pneumonectomy model thus offers powerful insight concerning adaptive organ growth.
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Affiliation(s)
- L M Brown
- Department of Cellular & Molecular Physiology, The Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033, USA
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