Safety and efficacy of smart tracheal occlusion device in diaphragmatic hernia lamb model.

OBJECTIVE: To investigate the efficacy and safety of the 'smart' tracheal occlusion (Smart-TO) device in fetal lambs with diaphragmatic hernia (DH). METHODS: DH was created in fetal lambs on gestational day 70 (term, 145 days). Fetuses were allocated to either pregnancy continuation until term (DH group) or fetoscopic endoluminal tracheal occlusion (TO), performed using the Smart-TO balloon on gestational day 97 (DH + TO group). On gestational day 116, the presence of the balloon was confirmed on ultrasound, then the ewe was walked around a 3.0-Tesla magnetic resonance scanner for balloon deflation, which was confirmed by ultrasound immediately afterwards. At term, euthanasia was performed and the fetus retrieved. Efficacy of occlusion was assessed by the lung-to-body-weight ratio (LBWR) and lung morphometry. Safety parameters included tracheal side effects assessed by morphometry and balloon location after deflation. The unoccluded DH lambs served as a comparator. RESULTS: Six fetuses were included in the DH group and seven in the DH + TO group. All balloons deflated successfully and were expelled spontaneously from the airways. In the DH + TO group, in comparison to controls, the LBWR at birth was significantly higher (1.90 (interquartile range (IQR), 1.43-2.55) vs 1.07 (IQR, 0.93-1.46); P = 0.005), while on lung morphometry, the alveolar size was significantly increased (mean linear intercept, 47.5 (IQR, 45.6-48.1) vs 41.9 (IQR, 38.8-46.1) µm; P = 0.03); whereas airway complexity was lower (mean terminal bronchiolar density, 1.56 (IQR, 1.0-1.81) vs 2.23 (IQR, 2.14-2.40) br/mm2 ; P = 0.005). Tracheal changes on histology were minimal in both groups, but more noticeable in fetal lambs that underwent TO than in unoccluded lambs (tracheal score, 2 (IQR, 1-3) vs 0 (0-1); P = 0.03). CONCLUSIONS: In fetal lambs with DH, TO using the Smart-TO balloon is effective and safe. Occlusion can be reversed non-invasively and the deflated intact balloon expelled spontaneously from the fetal upper airways. © 2020 International Society of Ultrasound in Obstetrics and Gynecology.

New device permitting non-invasive reversal of fetal endoscopic tracheal occlusion: ex-vivo and in-vivo study.

OBJECTIVE: One of the drawbacks of fetal endoscopic tracheal occlusion (FETO) for congenital diaphragmatic hernia is the need for a second invasive intervention to re-establish airway patency. The 'Smart-TO' device is a new balloon for FETO that deflates spontaneously when placed in a strong magnetic field, therefore overcoming the need for a second procedure. The safety and efficacy of this device have not yet been demonstrated. The aim of this study was to investigate the reversibility, local side effects and occlusiveness of the Smart-TO balloon, both in a simulated in-utero environment and in the fetal lamb model. METHODS: First, the reversibility of tracheal occlusion by the Smart-TO balloon was tested in a high-fidelity simulator. Following videoscopic tracheoscopic balloon insertion, the fetal mannequin was placed within a 1-L water-filled balloon to mimic the amniotic cavity. This was held by an operator in front of their abdomen, and different fetal and maternal positions were simulated to mimic the most common clinical scenarios. Following exposure to the magnetic field generated by a 1.5-T magnetic resonance (MR) machine, deflation of the Smart-TO balloon was assessed by tracheoscopy. In cases of failed deflation, the mannequin was reinserted into a water-filled balloon for additional MR exposure, up to a maximum of three times. Secondly, reversibility, occlusiveness and local effects of the Smart-TO balloon were tested in vivo in fetal lambs. Tracheal occlusion was performed in fetal lambs on gestational day 95 (term, 145 days), either using the balloon currently used in clinical practice (Goldbal2) (n = 5) or the Smart-TO balloon (n = 5). On gestational day 116, the presence of the balloon was assessed by tracheoscopy. Deflation was performed by puncture (Goldbal2) or MR exposure (Smart-TO). Six unoccluded fetal lambs served as controls. Following euthanasia, the lung-to-body-weight ratio (LBWR), lung morphometry and tracheal circumference were assessed. Local tracheal changes were measured using a hierarchical histologic scoring system. RESULTS: Ex vivo, Smart-TO balloon deflation occurred after a single MR exposure in 100% of cases in a maternal standing position with the mannequin at a height of 95 cm (n = 32), 55 cm (n = 8) or 125 cm (n = 8), as well as when the maternal position was 'lying on a stretcher' (n = 8). Three out of eight (37.5%) balloons failed to deflate at first exposure when the maternal position was 'sitting in a wheelchair'. Of these, two balloons deflated after a second MR exposure, but one balloon remained inflated after a third exposure. In vivo, all Smart-TO balloons deflated successfully. The LBWR in fetal lambs with tracheal occlusion by a Smart-TO balloon was significantly higher than that in unoccluded controls, and was comparable with that in the Goldbal2 group. There were no differences in lung morphometry and tracheal circumference between the two balloon types. Tracheal histology showed minimal changes for both balloons. CONCLUSIONS: In a simulated in-utero environment, the Smart-TO balloon was effectively deflated by exposure of the fetus in different positions to the magnetic field of a 1.5-T MR system. There was only one failure, which occurred when the mother was sitting in a wheelchair. In healthy fetal lambs, the Smart-TO balloon is as occlusive as the clinical standard Goldbal2 system and has only limited local side effects. © 2020 International Society of Ultrasound in Obstetrics and Gynecology.

Combined or Serial Liver and Lung Transplantation for Epithelioid Hemangioendothelioma: A Case Series.

Epithelioid hemangioendothelioma (EHE) is a rare vascular tumor with variable biological and clinical behavior. There is increasing experience with liver transplantation (LiTx) for hepatic EHE, even in cases of extrahepatic disease localization. Until now, no cases of lung transplantation (LuTx) had been reported for pulmonary EHE. This report describes three cases of EHE with multifocal disease in patients who underwent either serial or combined LiTx and LuTx.

Azithromycin and the treatment of lymphocytic airway inflammation after lung transplantation.

Lymphocytic airway inflammation is a major risk factor for chronic lung allograft dysfunction, for which there is no established treatment. We investigated whether azithromycin could control lymphocytic airway inflammation and improve allograft function. Fifteen lung transplant recipients demonstrating acute allograft dysfunction due to isolated lymphocytic airway inflammation were prospectively treated with azithromycin for at least 6 months (NCT01109160). Spirometry (FVC, FEV1 , FEF25-75 , Tiffeneau index) and FeNO were assessed before and up to 12 months after initiation of azithromycin. Radiologic features, local inflammation assessed on airway biopsy (rejection score, IL-17(+) cells/mm(2) lamina propria) and broncho-alveolar lavage fluid (total and differential cell counts, chemokine and cytokine levels); as well as systemic C-reactive protein levels were compared between baseline and after 3 months of treatment. Airflow improved and FeNO decreased to baseline levels after 1 month of azithromycin and were sustained thereafter. After 3 months of treatment, radiologic abnormalities, submucosal cellular inflammation, lavage protein levels of IL-1ß, IL-8/CXCL-8, IP-10/CXCL-10, RANTES/CCL5, MIP1-α/CCL3, MIP-1ß/CCL4, Eotaxin, PDGF-BB, total cell count, neutrophils and eosinophils, as well as plasma C-reactive protein levels all significantly decreased compared to baseline (p < 0.05). Administration of azithromycin was associated with suppression of posttransplant lymphocytic airway inflammation and clinical improvement in lung allograft function.

Steam ablation versus radiofrequency and laser ablation: an in vivo histological comparative trial.

OBJECTIVE: There is an increasing use of minimal invasive techniques to treat saphenous vein reflux. Among these radiofrequency ablation (RFA), endovenous laser ablation (EVLA), and foam sclerotherapy are frequently used. A new method of thermal ablation is the steam vein sclerosing (SVS) system. This study evaluates the histological changes after ablation of the saphenous veins in goats with RFA, EVLA, and SVS. METHODS: Twelve saphenous veins in six goats were treated with one of the three treatment modalities: four veins with RFA, four with EVLA, four with SVS. Seven days after treatment occlusion and diameter changes were evaluated by ultrasound imaging and histological changes were examined microscopically. RESULTS: Vein length, mean diameter, and the amount of tumescence was comparable between the three groups. Histological examination showed extensive vein wall destruction, the least in the outer layer of the vein wall. The total vein wall damage was 9.2/15 (SD 3.5) for EVLA, 13.3/15 (SD 3.3) for RFA, and 11.2/15 (SD 2.8) for SVS group. There was no significant difference among the three groups. Perivenous tissue damage was low. No extrafascial damage was seen. CONCLUSION: Histological findings after steam ablation are similar to the RFA and EVLA with a low perivenous tissue destruction score and a high vein wall destruction score.

Lymphocytic bronchiolitis after lung transplantation is associated with daily changes in air pollution.

Acute rejection represents a major problem after organ transplantation, being a recognized risk for chronic rejection and mortality. Recently, it became clear that lymphocytic bronchiolitis (LB, B-grade acute rejection) is more important than previously thought, as it predisposes to chronic rejection. We aimed to verify whether daily fluctuations of air pollution, measured as particulate matter (PM) are related to histologically proven A-grade rejection and/or LB and bronchoalveolar lavage (BAL) fluid cellularity after lung transplantation. We fitted a mixed model to examine the association between daily variations in PM(10) and A-grade rejection/LB on 1276 bronchoscopic biopsies (397 patients, 416 transplantations) taken between 2001 and 2011. A difference of 10 µg/m(3) in PM(10) 3 days before diagnosis of LB was associated with an OR of 1.15 (95% CI 1.04-1.27; p = 0.0044) but not with A-grade rejection (OR = 1.05; 95% CI 0.95-1.15; p = 0.32). Variations in PM(10) at lag day 3 correlated with neutrophils (p = 0.013), lymphocytes (p = 0.0031) and total cell count (p = 0.024) in BAL. Importantly, we only found an effect of PM10 on LB in patients not taking azithromycin. LB predisposed to chronic rejection (p < 0.0001). The risk for LB after lung transplantation increased with temporal changes in particulate air pollution, and this was associated with BAL neutrophilia and lymphocytosis. Azithromycin was protective against this PM effect.

Pulmonary alveolar microlithiasis: a case report and review of the literature.

A 12-year-old girl of Turkish descent was referred 6 weeks after an influenza A infection because of persistent chest X-ray abnormalities compatible with interstitial lung disease. The clinically suspected diagnosis of pulmonary alveolar microlithiasis (PAM) supported by pathognomonic radiological abnormalities was confirmed by genetic analysis. The clinical presentation of PAM is illustrated by a case and review of the current literature on this subject: you only see what you know.

Lung exposure to nanoparticles modulates an asthmatic response in a mouse model.

The aim of this study was to investigate the modulation of an asthmatic response by titanium dioxide (TiO2) or gold (Au) nanoparticles (NPs) in a murine model of diisocyanate-induced asthma. On days 1 and 8, BALB/c mice received 0.3% toluene diisocyanate (TDI) or the vehicle acetone-olive oil (AOO) on the dorsum of both ears (20 µL). On day 14, the mice were oropharyngeally dosed with 40 µL of a NP suspension (0.4 mg·mL⁻¹ (∼0.8 mg·kg⁻¹) TiO2 or Au). 1 day later (day 15), the mice received an oropharyngeal challenge with 0.01% TDI (20 µL). On day 16, airway hyperreactivity (AHR), bronchoalveolar lavage (BAL) cell and cytokine analysis, lung histology, and total serum immunoglobulin E were assessed. NP exposure in sensitised mice led to a two- (TiO2) or three-fold (Au) increase in AHR, and a three- (TiO2) or five-fold (Au) increase in BAL total cell counts, mainly comprising neutrophils and macrophages. The NPs taken up by BAL macrophages were identified by energy dispersive X-ray spectroscopy. Histological analysis revealed increased oedema, epithelial damage and inflammation. In conclusion, these results show that a low, intrapulmonary doses of TiO2 or Au NPs can aggravate pulmonary inflammation and AHR in a mouse model of diisocyanate-induced asthma.

Azithromycin reduces pulmonary fibrosis in a bleomycin mouse model.

Idiopathic pulmonary fibrosis (IPF) is a devastating disease without proper treatment. Despite intensive research, the exact underlying pathogenesis remains elusive. It is regarded as a continuous injury, resulting in inflammation, infiltration, and proliferation of fibroblasts and extracellular matrix deposition, leading to an irreversible restrictive lung function deterioration and death. In this study the effect of azithromycin, a macrolide antibiotic on bleomycin-induced pulmonary fibrosis was investigated. C57BL/6 mice were intratracheally instilled with bleomycin (0.5 mg/kg) or saline. In the bleomycin group, half of the animals received azithromycin every other day from day 1 on. Bronchoalveolar lavage and histology were performed at days 7 and 35, and pulmonary function tests on day 35. At day 35, fibrotic lesions (spindle cell proliferation/collagen I deposition) were paralleled by a restrictive lung function pattern. Alterations were found in neutrophils and macrophages (innate immunity) and in T(H)2, T(H)17, and Treg cytokines (adaptive immunity). Azithromycin significantly reduced both fibrosis and the restrictive lung function pattern. This study demonstrated a beneficial effect of azithromycin on bleomycin-induced pulmonary fibrosis. A possible mechanism could be a modulation of both innate immunity and adaptive immunity. These findings might suggest a potential role for azithromycin in the treatment of IPF.

Follicular bronchiolitis: a rare cause of bronchiolitis obliterans syndrome after lung transplantation: a case report.

This case report is the first confirmed case of follicular bronchiolitis (FB), a rare bronchiolar disorder characterized by peribronchiolar lymphoid follicles, in a series of over 400 lung transplantations performed in our center. It is to our knowledge, the first publication describing FB after lung transplantation (LTx), presenting as chronic allograft dysfunction or bronchiolitis obliterans syndrome (BOS).

Promoter methylation of TIMP3 and CDH1 predicts better outcome in head and neck squamous cell carcinoma treated by radiotherapy only.

As with other solid tumor types, head and neck squamous cell carcinoma (HNSCC) has been identified as an epigenetic, as well as genetic, disease. Consequently, promoter hypermethylation, being the most important aberrant epigenetic characteristic, has been intensively investigated for its biomarker potential in this cancer type. As many of these evaluations are obscured by a heterogeneity of treatments, the current study aimed to evaluate the incidence and prognostic value of the promoter hypermethylation of TIMP3, CDH1, DAPK, RASSF1A, p16INK4A and MGMT in HNSCC treated solely by radiotherapy. In 46 patients with advanced HNSCC treated with a hybrid accelerated fractionation radiotherapy schedule, DNA extracted from pretreatment paraffin-embedded tumor biopsies was used to determine the methylation status of the genes of interest by methylation-specific PCR (MSP). The detected epigenetic silencing was related with outcome in terms of locoregional control (LRC), and overall (OS), disease-free (DFS) and disease-specific survival (DSS). Tumor biopsies revealed the epigenetic silencing of MGMT in 42.5% (17 of 40) of patients and of TIMP3 in 40.5% (17 of 42) of cases. For the remaining investigated genes, a lower methylation percentage was detected: 13.2% (5 of 38) for CDH1, 11.4% (4 of 44) for DAPK, 4.8% (2 of 42) for p16INK4A and 2.4% (1 of 41) for RASSF1A. The promoter hypermethylation of TIMP3 and CDH1 was significantly related with better LRC (p=0.009 and p=0.02, respectively), OS (p=0.005 and p=0.002, respectively), DFS (p=0.02 and p=0.004, respectively) and DSS (p=0.12 and p=0.007, respectively). In conclusion, in this representative group of 46 patients with advanced HNSCC treated by radiotherapy only, the epigenetic silencing of TIMP3 and CDH1 predicted a better outcome.

The lectin-like domain of thrombomodulin protects against ischaemia-reperfusion lung injury.

Ischaemia-reperfusion injury of the lung is a major cause of morbidity and mortality, particularly following lung transplantation, the mainstay treatment for patients with end-stage pulmonary disease. Effective measures to prevent this complication are lacking. Thrombomodulin (TM) is an endothelial cell receptor and cofactor for thrombin-mediated generation of the anticoagulant and anti-inflammatory activated protein C (APC). The N-terminal lectin-like domain (LLD) of TM has no direct effects on coagulation, but has distinct anti-inflammatory properties, interfering with leukocyte adhesion, complement activation and cytokine generation, all of which are hallmarks of ischaemia-reperfusion injury. Using a murine model of lung ischaemia-reperfusion injury (90 min ischaemia, 4 h reperfusion), the present study shows that mice lacking the LLD of TM respond with increased extravasation of neutrophils and macrophages into the lung parenchyma and bronchoalveolar fluid (BALF), with augmented BALF levels of cytokines interleukin (IL)-1beta and granulocyte-monocytic colony-stimulating factor (GM-CSF). Pre-treatment of wild-type mice with recombinant LLD, as compared with controls, significantly suppresses protein leakage and accumulation of leukocytes in the BALF. These novel findings support further evaluation of recombinant lectin-like domain of thrombomodulin to protect the lung against tissue-damaging pro-inflammatory responses following ischaemia-reperfusion.

A dichotomy in bronchiolitis obliterans syndrome after lung transplantation revealed by azithromycin therapy.

Bronchiolitis obliterans syndrome (BOS) is the most important cause of late mortality following lung transplantation, resulting in major morbidity and a huge burden on healthcare resources. Treatment options are limited, resulting in a mere stabilisation of the lung function decline. Recent introduction of the macrolide antibiotic azithromycin raised new hope after demonstrating lung function improvement in subsets of patients. The present study aimed to provide an overview of the clinical effects on azithromycin in the setting of BOS after lung transplantation, with special emphasis on the anti-inflammatory actions. Moreover, the authors proposed a new frame of thinking centred on a dichotomy in the pathogenesis and clinical phenotype of BOS. Subsets of BOS patients were identified who do or do not respond to azithromycin (regarding forced expiratory volume in one second (FEV(1)), bronchoalveolar lavage (BAL) neutrophilia/interleukin-8). These observations have shed new light on the current belief that BOS represents a homogenous clinical entity in which the neutrophil is the main culprit. Recent clinical observations, supported by research findings, have revealed a dichotomy in the clinical spectrum of BOS with neutrophilic (partially) reversible allograft dysfunction (responding to azithromycin) and fibroproliferative BOS (not responding to azithromycin). This concept is reinforced by unique data obtained in BOS patients, consisting of histology specimens, physical and radiological examination, FEV(1 )and BAL examination. The acceptance of this dichotomy can improve understanding of the heterogeneous pathological condition that constitutes bronchiolitis obliterans syndrome, thus encouraging a more accurate diagnosis and, ultimately, better tailored treatment for each bronchiolitis obliterans syndrome patient.

Multidisciplinary interobserver agreement in the diagnosis of idiopathic pulmonary fibrosis.

The purpose of the present study was to evaluate the accuracy of the diagnosis of idiopathic pulmonary fibrosis (IPF) by respiratory physicians in six European countries, and to calculate the interobserver agreement between high-resolution computed tomography reviewers and histology reviewers in IPF diagnosis. The diagnosis of usual interstitial pneumonia (UIP) was assessed by a local investigator, following the American Thoracic Society/European Respiratory Society consensus statement, and confirmed when a minimum of two out of three expert reviewers from each expert panel agreed with the diagnosis. The level of agreement between readers within each expert panel was calculated by weighted kappa. The diagnosis of UIP was confirmed by the expert panels in 87.2% of cases. A total of 179 thoracic high-resolution computed tomography scans were independently reviewed, and an interobserver agreement of 0.40 was found. Open or thoracoscopic lung biopsy was performed in 97 patients, 82 of whom could be reviewed by the expert committee. The weighted kappa between histology readers was 0.30. It is concluded that, although the level of agreement between the readers within each panel was only fair to moderate, the overall accuracy of a clinical diagnosis of idiopathic pulmonary fibrosis in expert centres is good (87.2%).

Fatal calciphylaxis in two patients with giant cell arteritis.

Two elderly female patients with fatal calciphylaxis, despite nearly normal renal functions, occurring during treatment for giant cell arteritis, are described. The possible mechanisms for this association are discussed.

The importance of lymphocytes in lung ischemia-reperfusion injury.

In a murine model of lung ischemia-reperfusion injury (IRI), we previously demonstrated that lymphocytes increase in the alveolar space during the ischemic period. We hypothesized that these lymphocytes play an important role during ischemia in the development of lung IRI. In the present study, severe combined immunodeficiency (SCID) mice, lacking T cells, were used to further investigate our hypothesis. SCID and control mice underwent 90 minutes of left lung ischemia followed by 4 hours of reperfusion. A significant decrease in neutrophils, together with lower levels of interleukin-1beta, was found in SCID mice after reperfusion. We concluded that lymphocytes invading the lung during ischemia trigger an inflammatory response upon reperfusion. Antilymphocyte therapies in the donor should be further investigated as treatment strategies against IRI.

An optimized non-destructive protocol for testing mechanical properties in decellularized rabbit trachea.

Successful tissue-engineered tracheal transplantation relies on the use of non-immunogenic constructs, which can vascularize rapidly, support epithelial growth, and retain mechanical properties to that of native trachea. Current strategies to assess mechanical properties fail to evaluate the trachea to its physiological limits, and lead to irreversible destruction of the construct. Our aim was to develop and evaluate a novel non-destructive method for biomechanical testing of tracheae in a rabbit decellularization model. To validate the performance of this method, we simultaneously analyzed quantitative and qualitative graft changes in response to decellularization, as well as in vivo biocompatibility of implanted scaffolds. Rabbit tracheae underwent two, four and eight cycles of detergent-enzymatic decellularization. Biomechanical properties were analyzed by calculating luminal volume of progressively inflated and deflated tracheae with microCT. DNA, glycosaminoglycan and collagen contents were compared to native trachea. Scaffolds were prelaminated in vivo. Native, two- and four-cycle tracheae showed equal mechanical properties. Collapsibility of eight-cycle tracheae was significantly increased from -40cm H2O (-3.9kPa). Implantation of two- and four-cycle decellularized scaffolds resulted in favorable flap-ingrowth; eight-cycle tracheae showed inadequate integration. We showed a more limited detergent-enzymatic decellularization successfully removing non-cartilaginous immunogenic matter without compromising extracellular matrix content or mechanical stability. With progressive cycles of decellularization, important loss of functional integrity was detected upon mechanical testing and in vivo implantation. This instability was not revealed by conventional quantitative nor qualitative architectural analyses. These experiments suggest that non-destructive, functional evaluation, e.g. by microCT, may serve as an important tool for mechanical screening of scaffolds before clinical implementation. STATEMENT OF SIGNIFICANCE: Decellularization is a front-running strategy to generate scaffolds for tracheal tissue-engineering. Preservation of biomechanical properties of the trachea during this process is paramount to successful clinical transplantation. In this paper, we evaluated a novel method for biomechanical testing of decellularized trachea. We detected important loss of functional integrity with progressive cycles of decellularization. This instability was not revealed by our quantitative nor qualitative analyses. These experiments suggest that the technique might serve as a performant, non-destructive tool for mechanical screening of scaffolds before clinical implementation.

Cerebral ischemia after filter-protected carotid artery stenting is common and cannot be predicted by the presence of substantial amount of debris captured by the filter device.

PURPOSE: Protected carotid artery stent placement is currently under clinical evaluation as a potential alternative to carotid endarterectomy. The current study was undertaken to determine the incidence of new ischemic lesions found on diffusion-weighted MR imaging (DWI) in nonselected patients after protected carotid artery stent placement using a filter device and to determine the potential relationship between these new ischemic lesions and the presence or absence of a clear amount of debris captured by the neuroprotection filter device. MATERIALS AND METHODS: A nonrandomized cohort of 52 patients (40 men, 12 women) presenting with carotid occlusive disease underwent protected carotid artery stent placement using a filter device. DWI obtained 1 day before stent placement was compared with that obtained 1 day after stent placement. In addition, the macroscopic and microscopic analysis of debris captured by the filter device during the carotid stent placement procedure was assessed. RESULTS: Neuroprotected carotid stent placement was technically successful in all 53 procedures but was complicated by a transient ischemic attack in 3 patients (5.6%). In 22 patients (41.5%), new ischemic lesions were found on DWI, and in 21 filter devices (39.6%), a substantial amount of atheromatous plaque and/or fibrin was found. No clear relationship between the presence of debris captured by the filter device and new lesions detected by DWI was found (P = .087; odds ratio 3.067). CONCLUSION: Neuroprotected carotid artery stent placement will not avoid silent cerebral ischemia. Systematic microscopic analysis of debris captured by the filter device has no predictive value for potential cerebral ischemia after carotid artery stent placement.