Showing papers on "Alveolar capillary dysplasia published in 2016"

Pulmonary hypertension associated with acute or chronic lung diseases in the preterm and term neonate and infant. The European Paediatric Pulmonary Vascular Disease Network, endorsed by ISHLT and DGPK.

Abstract: Persistent pulmonary hypertension of the newborn (PPHN) is the most common neonatal form and mostly reversible after a few days with improvement of the underlying pulmonary condition. When pulmonary hypertension (PH) persists despite adequate treatment, the severity of parenchymal lung disease should be assessed by chest CT. Pulmonary vein stenosis may need to be ruled out by cardiac catheterisation and lung biopsy, and genetic workup is necessary when alveolar capillary dysplasia is suspected. In PPHN, optimisation of the cardiopulmonary situation including surfactant therapy should aim for preductal SpO2between 91% and 95% and severe cases without post-tricuspid-unrestrictive shunt may receive prostaglandin E1 to maintain ductal patency in right heart failure. Inhaled nitric oxide is indicated in mechanically ventilated infants to reduce the need for extracorporal membrane oxygenation (ECMO), and sildenafil can be considered when this therapy is not available. ECMO may be indicated according to the ELSO guidelines. In older preterm infant, where PH is mainly associated with bronchopulmonary dysplasia (BPD) or in term infants with developmental lung anomalies such as congenital diaphragmatic hernia or cardiac anomalies, left ventricular diastolic dysfunction/left atrial hypertension or pulmonary vein stenosis, can add to the complexity of the disease. Here, oral or intravenous sildenafil should be considered for PH treatment in BPD, the latter for critically ill patients. Furthermore, prostanoids, mineralcorticoid receptor antagonists, and diuretics can be beneficial. Infants with proven or suspected PH should receive close follow-up, including preductal/postductal SpO2measurements, echocardiography and laboratory work-up including NT-proBNP, guided by clinical improvement or lack thereof.

Pathogenetics of alveolar capillary dysplasia with misalignment of pulmonary veins

Abstract: Alveolar capillary dysplasia with misalignment of pulmonary veins (ACDMPV) is a lethal lung developmental disorder caused by heterozygous point mutations or genomic deletion copy-number variants (CNVs) of FOXF1 or its upstream enhancer involving fetal lung-expressed long noncoding RNA genes LINC01081 and LINC01082. Using custom-designed array comparative genomic hybridization, Sanger sequencing, whole exome sequencing (WES), and bioinformatic analyses, we studied 22 new unrelated families (20 postnatal and two prenatal) with clinically diagnosed ACDMPV. We describe novel deletion CNVs at the FOXF1 locus in 13 unrelated ACDMPV patients. Together with the previously reported cases, all 31 genomic deletions in 16q24.1, pathogenic for ACDMPV, for which parental origin was determined, arose de novo with 30 of them occurring on the maternally inherited chromosome 16, strongly implicating genomic imprinting of the FOXF1 locus in human lungs. Surprisingly, we have also identified four ACDMPV families with the pathogenic variants in the FOXF1 locus that arose on paternal chromosome 16. Interestingly, a combination of the severe cardiac defects, including hypoplastic left heart, and single umbilical artery were observed only in children with deletion CNVs involving FOXF1 and its upstream enhancer. Our data demonstrate that genomic imprinting at 16q24.1 plays an important role in variable ACDMPV manifestation likely through long-range regulation of FOXF1 expression, and may be also responsible for key phenotypic features of maternal uniparental disomy 16. Moreover, in one family, WES revealed a de novo missense variant in ESRP1, potentially implicating FGF signaling in the etiology of ACDMPV.

Lethal lung hypoplasia and vascular defects in mice with conditional Foxf1 overexpression.

Abstract: FOXF1 heterozygous point mutations and genomic deletions have been reported in newborns with the neonatally lethal lung developmental disorder, alveolar capillary dysplasia with misalignment of pulmonary veins (ACDMPV). However, no gain-of-function mutations in FOXF1 have been identified yet in any human disease conditions. To study the effects of FOXF1 overexpression in lung development, we generated a Foxf1 overexpression mouse model by knocking-in a Cre-inducible Foxf1 allele into the ROSA26 (R26) locus. The mice were phenotyped using micro-computed tomography (micro-CT), head-out plethysmography, ChIP-seq and transcriptome analyses, immunohistochemistry, and lung histopathology. Thirty-five percent of heterozygous R26-Lox-Stop-Lox (LSL)-Foxf1 embryonic day (E)15.5 embryos exhibit subcutaneous edema, hemorrhages and die perinatally when bred to Tie2-cre mice, which targets Foxf1 overexpression to endothelial and hematopoietic cells. Histopathological and micro-CT evaluations revealed that R26Foxf1; Tie2-cre embryos have immature lungs with a diminished vascular network. Neonates exhibited respiratory deficits verified by detailed plethysmography studies. ChIP-seq and transcriptome analyses in E18.5 lungs identified Sox11, Ghr, Ednrb, and Slit2 as potential downstream targets of FOXF1. Our study shows that overexpression of the highly dosage-sensitive Foxf1 impairs lung development and causes vascular abnormalities. This has important clinical implications when considering potential gene therapy approaches to treat disorders of FOXF1 abnormal dosage, such as ACDMPV.

Variable phenotypic presentation of a novel FOXF1 missense mutation in a single family.

Abstract: Summary Background Heterozygous mutations in the FOXF1 transcription factor gene are implicated in alveolar capillary dysplasia with misalignment of pulmonary veins (ACDMPV), a developmental disorder of the lungs classically presenting with pulmonary hypertension and early demise. Evidence has suggested haploinsufficiency and partial paternal imprinting. We present a family with several affected members with an extremely variable phenotype. Patients The index patient presented several hours after birth with severe pulmonary hypertension. She is now 3-years old, thriving on maximal pulmonary hypertension therapy, chronic steroids, and oxygen. One of the patient's siblings died at 16 days with pulmonary hypertension and an annular pancreas, consistent with classical ACDMPV. Methods Whole exome sequencing was performed in the index case. The identified variant was confirmed by Sanger sequencing, and tested in the remaining family members. Parental origin was determined by PCR amplification and cloning, sequencing, and identification of adjacent single nucleotide polymorphisms. Echocardiography was performed in the asymptomatic carriers. Results Whole exome analysis revealed a novel, predictably pathogenic heterozygous missense mutation, g.chr16:86544406 C>A NM_001451, c.C231A, p.F77L, in the FOXF1 gene. The mutation arose in the father, de novo, early postzygotically, with 70% somatic mosaicism in the blood, on the grandpaternal chromosome. It was also present in the proband's asymptomatic sister, found to have partial anomalous pulmonary venous return. Conclusion FOXF1 mutations may have an extremely variable phenotype, possibly as a result of somatic mosaicism and complex gene regulation including unorthodox imprinting of the gene locus. The prolonged survival of the proband suggests the need for aggressive treatment. Pediatr Pulmonol. © 2016 Wiley Periodicals, Inc.

Recommendations for utilization of the paracorporeal lung assist device in neonates and young children with pulmonary hypertension.

Abstract: The management of decompensating critically ill children with severe PH is extremely challenging and requires a multidisciplinary approach. Unfortunately, even with optimal care, these children might continue to deteriorate and develop inadequate systemic perfusion and at times cardiac arrest secondary to a pulmonary hypertensive crisis. Tools to support these children are limited, and at times, the team should proceed with offering extracorporeal support, especially in newly diagnosed patients who have not benefitted from medical therapy prior to their acute deterioration, in patients with severe pulmonary venous disease and in patients with alveolar capillary dysplasia. Currently, the only approved mode for extracorporeal support in pediatric patients with PH eligible for lung transplantation is ECMO. To decrease the risks associated with ECMO, and offer potential for increased duration of support, extubation, and rehabilitation, we transitioned four small children with refractory PH from ECMO to a device comprising an oxygenator interposed between the PA and LA. This work describes in great detail our experience with this mode of support with emphasis on exclusion criteria, the implantation procedure, and the post-implantation management.

Maternal somatic mosaicism of FOXF1 mutation causes recurrent alveolar capillary dysplasia with misalignment of pulmonary veins in siblings.

Abstract: Maternal Somatic Mosaicism of FOXF1 Mutation Causes Recurrent Alveolar Capillary Dysplasia with Misalignment of Pulmonary Veins in Siblings Ho Ming Luk, Tao Tang, Kwong Wai Richard Choy, Ming For Tony Tong, On Kit Wong, and Fai Man Ivan Lo* Department of Health, Clinical Genetic Service, Hong Kong, China Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong, China Department of Pathology, Queen Elizabeth Hospital, Hong Kong, China

FOXF1 gene mutation in alveolar capillary dysplasia associated with Hirschsprung's disease and clinical review

Abstract: measure of body fat distribution. A study of children between 7 and 18 years old with OSA showed that neck-to-waist ratio predicts OSA in obese and overweight older children. This study was initiated on the background knowledge that central adiposity and large neck circumference are known to be associated with OSA in adults. Third, there are no obesity clinics such as Kinder Overweight Activity Lifestyle Actions (KOALA) for children in most rural and regional areas in Australia making the management of obesity in children particularly difficult and further disadvantaging ATSI and widening the gap in access to health services. Some tertiary level obesity services could be made available to children in regional areas via telehealth links with travel reserved for detailed polysomnography and/or ear, nose and throat (ENT) procedures. Thefinding that ethnicitymight be a significant factor for the development of OSA raises concerns for hundreds of obese ATSI children in rural and remote areas who have limited access to detailed polysomnography, sleep clinics and Ear Nose and Throat services. I agree that clinicians need to have a low threshold in investigating and referring obese ATSI children for OSA.

Alveolar capillary dysplasia with misalignment of the pulmonary veins due to novel insertion mutation of FOXF1.

Abstract: Alveolar capillary dysplasia with misalignment of the pulmonary veins (ACD/MPV) is a rare congenital malformation in newborns that results in severe respiratory distress and pulmonary hypertension. Confirmatory diagnosis can be made only on histology. Characteristic histological features consist of reduction of the number of capillaries, malpositioning within the walls of the alveoli and thickening of the muscle layer of the pulmonary arteries. Recently, haploinsufficiency of FOXF1 was reported as a cause of ACD/MPV. Here, we report the identification of a new mutation of FOXF1 on direct gene sequencing in a newborn boy with ACD/MPV and multiple congenital anomalies who died of irreversible pulmonary hypertension on postnatal day 3.

Pre-cannulation lung biopsy shortens ECMO course.

Abstract: We describe the clinical course of an infant with respiratory failure who underwent lung biopsy prior to cannulation for undergoing extracorporeal membrane oxygenation (ECMO). Pathology revealed alveolar capillary dysplasia, and ECMO was discontinued. Rapid diagnosis allowed for closure and saved resources. We recommend considering early biopsy in infants with atypical pulmonary hypertension.

Fetal-MRI prenatal diagnosis of severe bilateral lung hypoplasia : alveolar capillary dysplasia case report

Abstract: Alveolar capillary dysplasia with misalignment of pulmonary veins (ACD/MPV) is a rare and lethal developmental disorder of the lung that affect both acinar structure and the intrinsic pulmonary vasculature. We report prenatal and postnatal imaging with histopathological findings of this rare condition. We, first, describe MR imaging features and discuss its role in prenatal imaging.

On the question of interstitial lung diseases in children: diffuse disorders of growth and development of the lungs

Abstract: The literature review provides current information on risk factors, clinical features, advanced diagnostic capabilities, prognosis diffuse disorders of growth and development of lung like interstitial lung disease specific to early childhood. Diffuse disorders of growth and development in children assigned to interstitial disease, due to the fact that along with anatomical defects of the lung, there is a significant increase in the interstitial tissue. Diffuse lung development disorders - acinar dysplasia, congenital alveolar dysplasia, and alveolar capillary dysplasia with misalignment of pulmonary veins is a rare condition, clinically manifested in the first hours of life, severe RDS infants, have a poor prognosis. Early diagnosis is essential for determining the management plan and prognosis of the disease. Diffuse lung disorders of growth occur in different states: bronchopulmonary dysplasia, pulmonary pathology in the neonatal period as in full-term baby so, chromosomal anomalies (trisomy 21 chromosome) and congenital heart diseases at chromosomal anomalies, and without them, congenital defects of other organs. Growth disorders formed as prenatally and postnatally and reflective of abnormalities of alveolarization. Pathology and radiology interpretation often noted the presence of emphysematous changes in these cases. The severity of the clinical course, complications, prognosis can vary in different forms. Lung growth disorders are risk factors for recurrent respiratory diseases and contribute to their chronic course.

enfermedad pulmonar difusa: causa de hipertensión pulmonar persistente antes del año de vida Diffuse lung disease: cause of persistent pulmonary hypertension before one year of age

Abstract: Pulmonary vascular disease in children is multifactorial and heterogeneous. While it shares some features with pulmonary hypertension in adults, there are differences in the associated comorbidities and conditions, the coexistence of genetic or developmental diseases. Interstitial lung diseases may be responsible for this entity. One is alveolar capillary dysplasia with misalignment of pulmonary veins, a rare pathology but with a mortality rate of 100%, characterized by a failure in the formation of lung tissue that eventually results in impaired gas diffusion. We present a 5-month-old patient studied due to suspected congenital heart disease with persistent

Clinicopathological analysis of pulmonary vascular disease in 38 neonates died of respiratory failure

Abstract: OBJECTIVE We reviewed the data of 38 neonates who died of respiratory failure. Paraffin sections of the autopsy lung samples were examined with HE staining or immunolabeling for CD34, CD68 and CK to observe the development of the pulmonary vessels and detect potential pulmonary vascular diseases (PVDs). Five cases were identified to have PVDs, including pulmonary hypertensive vascular remodeling in 3 cases and alveolar capillary dysplasia in 2 cases. The result indicated that PVD was one of the important reasons for respiratory failure in these neonates.