Bronchoalveolar Lavage In Patients Research Articles

The value of N-acetylcysteine bronchoalveolar lavage in patients with severe traumatic brain injury combined with ventilator-associated pneumonia

The value of N-acetylcysteine bronchoalveolar lavage in patients with severe traumatic brain injury combined with ventilator-associated pneumonia

Proteome and Dihydrorhodamine Profiling of Bronchoalveolar Lavage in Patients with Chronic Pulmonary Aspergillosis.

Neutrophil and (alveolar) macrophage immunity is considered crucial for eliminating Aspergillus fumigatus. Data derived from bronchoalveloar lavage (BAL) characterizing the human immuno-pulmonary response to Aspergillus fumigatus are non-existent. To obtain a comprehensive picture of the immune pathways involved in chronic pulmonary aspergillosis (CPA), we performed proteome analysis on AL of 9 CPA patients and 17 patients with interstitial lung disease (ILD). The dihydrorhodamine (DHR) test was also performed on BAL and blood neutrophils from CPA patients and compared to blood neutrophils from healthy controls (HCs). BAL from CPA patients primarily contained neutrophils, while ILD BAL was also characterized by a large fraction of lymphocytes; these differences likely reflecting the different immunological etiologies underlying the two disorders. BAL and blood neutrophils from CPA patients displayed the same oxidative burst capacity as HC blood neutrophils. Hence, immune evasion by Aspergillus involves other mechanisms than impaired neutrophil oxidative burst capacity per se. CPA BAL was enriched by proteins associated with innate immunity, as well as, more specifically, with neutrophil degranulation, Toll-like receptor 4 signaling, and neutrophil-mediated iron chelation. Our data provide the first comprehensive target organ-derived immune data on the human pulmonary immune response to Aspergillus fumigatus.

Prostaglandin E2/Leukotriene B4 balance and viral load in distinct clinical stages of COVID-19: A cross-sectional study

BackgroundProstaglandin E2 (PGE2) and leukotriene B4 (LTB4) are eicosanoids involved in modulation of the antiviral immune response. Recent studies have identified increased levels of several eicosanoids in the plasma and bronchoalveolar lavage of patients with coronavirus disease (COVID-19). This study investigated correlations between plasma levels of PGE2 and LTB4 and clinical severity of COVID-19. MethodsThis cross-sectional study involved non-infected (n = 10) individuals and COVID-19 patients classified as cured (n = 13), oligosymptomatic (n = 29), severe (n = 15) or deceased (n = 11). Levels of D-dimer a, known COVID-19 severity marker, PGE2 and LTB4 were measured by ELISAs and data were analysed with respect to viral load. ResultsPGE2 plasma levels were decreased in COVID-19 patients compared to the non-infected group. Changes in PGE2 and LTB4 levels did not correlate with any particular clinical presentations of COVID-19. However, LTB4 was related to decreased SARS-CoV-2 burden in patients, suggesting that only LTB4 is associated with control of viral load. ConclusionsOur data indicate that PGE2/LTB4 plasma levels are not associated with COVID-19 clinical severity. Hospitalized patients with COVID-19 are treated with corticosteroids, which may influence the observed eicosanoid imbalance. Additional analyses are required to fully understand the participation of PGE2 receptors in the pathophysiology of COVID-19.

A Different Perspective on the COVID-19 Pandemic: Origin of the Outbreak (Part 1).

In December 2019, an outbreak caused by novel coronavirus 2019 (COVID-19) started in Wuhan, China. After extensive speculation about a causative agent, a novel betacoronavirus, in the same family as SARS-CoV and MERS-CoV, was identified via next-generation sequencing from samples received from several pneumonia patients. Ribonucleic acid extracted from the patient's bronchoalveolar lavage fluid was used as a template to clone and sequence the genome of SARS-CoV-2. Shortly after, the World Health Organization announced a worldwide pandemic. However, later reports revealed that the COVID-19 pathogen has a genetic footprint that had never been observed in natural coronavirus, suggesting a "gain of function virus" that might have been engineered in a laboratory. Clear conclusions about the outbreak's origins are still lacking. Theories regarding most probable wildlife animal reservoir for the SARS-CoV-2 have been scientifically shaky. Exactly how the virus jumped from wild animals to humans remains a mystery. Onging debate coalesces around 2 competing theories: laboratory accidental versus intentional escape scenario of a genetically engineered virus versus zoonotic emergence. Within a year after the declaration of the COVID-19 pandemic, Pfizer-BioNTech and Moderna published their 2-month duration follow-up mRNA vaccine trial results. Later reports revealed a rapidly declining vaccineinduced immunity, questionable effectiveness of these vaccines against the new variants despite boosting, inability to stop viral transmission, and, most importantly, the onset of serious adverse events. In the 2 context of all these uncertainties, controversies, and the remaining many unanswered questions, this first review presents a different perspective on the origin of the COVID-19 pandemic. A later analysis will address the subsequent events that followed in terms of diagnosis, protective measures, vaccines roll-out and vaccine mandate.

A Different Perspective on the COVID-19 Pandemic: Validity of COVID-19 Testing and Protective Nonpharmaceutical Interventions (Part 2).

The causative agent for COVID-19 was identified by next-generation sequencing from samples received from several pneumonia patients. The detection of the coronavirus was done through real-time polymerase chain reaction analyses performed from plasma sample. Ribonucleic acid extracted from a patient's bronchoalveolar lavage fluid was used as a template to clone and sequence a genome from lineage B of the betacoronavirus. A polymerase chain reaction test was considered positive using cycle threshold above 34 for detected samples. Tests with thresholds so high will detect genetic leftover fragments, which pose no particular risk. No correlation between viral load and disease severity has ever been connected to a virus. On the basis of the little science centered on misleading mortality calculations and most importantly on mathematical disease modeling, generalized lockdowns were imposed on a global scale, with a considerable number of fatalities and resulting in global economic breakdown. Most studies found little to no evidence for the effectiveness of face masks in the general population, neither as personal protective equipment nor as a source control. In this review, we attempted to expose a different perspective of some aspects of the pandemic related to disease diagnosis and protective nonpharmacologic interventions. Our viewpoint raises serious questions on the validity of such restrictive measures in saving lives and warn against the application of such damaging strategies in a potential future outbreak.

Mycobacterium tuberculosis-specific memory T cells in bronchoalveolar lavage of patients with pulmonary tuberculosis

BackgroundMycobacterium tuberculosis(MTB) most often infects the lungs and results in pulmonary tuberculosis(TB). MTB-specific memory T cells are able to respond quickly against antigens and help reduce the burden of pulmonary bacteria. The characteristics, function and chemotaxis axis of memory T cells in the lung remain unclear. The current study aimed to clarify the classification, function and recruitment of local antigen-specific memory T cells in the lung and the periphery blood of patients with pulmonary TB. MethodsA total of 85 patients with active pulmonary TB were included in the study. Bronchoalveolar lavage fluid (BALF) and Peripheral blood were collected for further detection. The cell-surface markers and intracellular staining of memory T cell subtypes were measured by flow cytometry. The level of CXCL9, CXCL10 and CXCL11 in Bronchoalveolar lavage fluid cells and peripheral blood mononuclear cells (PBMC) were measured by Real-time PCR. ResultsThe ratio of effective Memory T cells (TEM) were the highest in BALF of patients with pulmonary TB. In patients, CXCR3 and its ligands was increased in memory T cells of BALF compared with PBMC. IFN-γ+TNF-α+ effective Memory T cells and central memory T cells from BALF were increased after antigen stimulation. CXCR3 was higher in IFN-γ+ compared with IFN-γ− in CD4+ TCM and TEM from BALF of patients. Compared with PBMC, the PD-1 levels of terminal effector memory RA+(TEMRA) and TEM cells in CD4+ memory T cells of BALF were significantly increased. In addition, PD-1 was increased in IFN-γ+ compared with IFN-γ− in CD4+TEM from BALF of patients. There was no difference in Treg ratio between PBMC and BALF of TB patients. ConclusionsThe CXCL9/CXCL11-CXCR3 axis may participate in the chemotaxis of memory T cells from the peripheral to lung. CD4+TEM and TEMRA in BALF may have exhausted, especially the cytokine producing TEM. Our study clarified the characteristics of antigen-specific memory T cells in local lung and may have impact on strategies of therapy and vaccine.

Utility of fibroblasts derived from broncho-alveolar lavage of patients with idiopathic pulmonary fibrosis or related disorders to develop in vitro models

Broncho-alveolar lavage (BAL) represents a safe tool for the differential diagnosis of various pulmonary fibrotic diseases. Idiopathic pulmonary fibrosis (IPF) belongs to a heterogeneous group of diseases, interstitial lung disease (ILD), presenting a progressive impairment of pulmonary functions. IPF is characterized by the excessive accumulation of extracellular matrix (ECM) in the alveolar parenchyma that may lead to irreversible pulmonary remodeling. Although the exact pathogenetic mechanisms leading to IPF development are still unclear it has been demonstrated that fibroblasts differentiating toward myofibroblasts are the major actors involved in this process. The possibility of obtaining and expanding fibroblasts from the BAL of ILD patients for research purposes has been recently explored. This approach is discussed here as a reliable chance, helpful to advance the scientific community knowledge and to devise two- and three-dimensional (2D/3D) pre-clinical in vitro models of these diseases, further overcoming technical and ethical concerns related to the use of fibroblasts derived from tissue biopsy.

Severe Pneumocystis Pneumonia Associated with Ulcerative Colitis

A 56-year-old woman with a 9-month history of ulcerative colitis (UC) who had been treated with prednisolone (PSL) 40 mg/day and azathioprinefor 2 months was referred to our hospital because of fever and dyspnea. Computed tomography (CT) of the chest revealed diffuse ground-glass opacities in both lungs and consolidation in both lower lobes. PCR of the patient's bronchoalveolar lavage fluid was positive for pneumocystis jirovecii, and she was diagnosed with pneumocystis pneumonia (PCP). The patient developed refractory respiratory failure that required invasive mechanical ventilation. After sulfamethoxazole-trimethoprim administration and methyl prednisolone pulse therapy, her clinical condition improved dramatically. Few reports are available on severe PCP associated with UC. It is important to keep in mind the possibility of complication by PCP in UC patients.

Interleukins in serum and bronchoalveolar lavage in patients with chronic obstructive pulmonary disease or bronchial asthma after pulmonary tuberculosis or pneumonia

The spread of respiratory diseases has become a topical issue of modern medicine. The prevalence of the diseases caused the rising rates of disability and mortality among people affected by respiratory diseases. The clinical course of respiratory diseases includes the disorders of general and local adaptive and protective mechanisms and cell-mediated connections. Objective — to determine the interleukin profile of serum and bronchoalveolar lavage for the verification of chronic obstructive pulmonary disease (COPD) or bronchial asthma in patients with pulmonary tuberculosis or pneumonia with bronchial obstruction syndrome. Materials and methods. 67 patients affected by chronic obstructive pulmonary disease and 33 patients diagnosed with bronchial asthma who were hospitalized in the Pulmonology Lviv Regional Diagnostic Center during 2015—2020, were examined. The patients were verified with a non-complicated tuberculosis without any destructive changes evident in the lungs (the first or third clinical category of patients), the community-acquired pneumonia with the bronchial obstruction syndrome. Pro-inflammatory interleukins IL-1β, IL-2, IL-6, TNF-α and anti-inflammatory IL-4 in serum and bronchoalveolar lavage were revealed during the lobar and tertiary bronchi fiber-optic bronchoscopy. Results and discussion. The interleukins misbalance was evident: the decrease in IL-1β and IL-2 and the increase in IL-6 and TNF-α by 4.5 times as compared to the unaffected donors was revealed in the patients with chronic obstructive pulmonary disease. The significant decrease in IL-4 was revealed pointing at the high probability of the severe and prolonged COPD and leading to frequent exacerbation and compilations of the disease. By contrast, the patients diagnosed with bronchial asthma showed higher IL-1β and IL-2 as compared to the unaffected patients; the level of IL-6 was higher as compared to the COPD patients, while TNF-α was lower. The patients with bronchial asthma showed higher IL-4 than the unaffected donors and the patients with COPD. Conclusions. The intensity of interleukins expression (especially pro-inflammatory) revealed the level of inflammation based on the acute-phase proteins in the proteolytic-antiproteolytic balance, which may be also used as the additional criteria for the differential diagnostics and justification for the treatment optimization.

Risk factors and outcomes of fungal superinfections in patients with severe COVID-19: an observational study from Pisa academic hospital.

Superinfections acquired during the hospital course represent common complications in COVID-19 patients. Several studies reported an increasing incidence of COVID-19 associated pulmonary aspergillosis (CAPA) and candidaemia. The aim of this study is to describe fungal superinfections in a large cohort of hospitalized patients with COVID-19 and identify factors independently associated with the risk of fungal superinfections. Observational study including patients with COVID-19 admitted to the tertiary-care, University Hospital of Pisa, Italy from April 2020 to May 2021. Patients with pneumonia and laboratory confirmed SARS-CoV-2 infection with a RT-PCR test on a nasopharyngeal swab, were eligible for the study. Patients who died within 24 hours from admission and those with missing data were excluded. Data about fungal superinfections were collected. To identify factors independently associated with the development of fungal superinfections, a multivariate regression analysis was performed. Among 983 patients with COVID-19, 52 (5.3%) fungal superinfections were detected. Fungal superinfections included: 24/52 (46%) CAPA, 27/52 (51.9%) episodes of candidaemia and 1 case of pulmonary pneumocystosis in a haematological patient. All patients with CAPA were cared for in intensive care unit (ICU). The majority of patients received liposomal amphotericin B as antifungal treatment (83.3%). In-hospital mortality was 41.7%. Among 27 episodes of candidaemia, 16 (59.3%) occurred in ICU while 11 (40.7%) in medical wards. In-hospital mortality was 14.8%. Overall, patients with fungal superinfections had a median age of 73 (IQRs 59-77) years and a median length of ICU stay of 40 (17-50) days. In-hospital mortality among all patients with superinfections was 28.8%. On multivariable analysis, ICU stay (OR 17.63, 95% CI 8.3-37.41, p<0.001), high-dose steroids (OR 13.48, 95% CI 6.68-27.26, p<0.001), and diabetes mellitus (OR 2.14, 95% CI 1.09-4.17, p=0.026) were factors independently associated with the risk of developing a fungal superinfection. Fungal superinfections may complicate the hospital course of COVID-19 patients, especially of those admitted to ICU. Surveillance with detection of galactomannan on bronchoalveolar lavage in patients with clinical deterioration should be performed. A rational use of steroids is essential to avoid the risk of developing a fungal superinfection.

P118 Pentraxin-3 interacts with Aspergillus fumigatus conidia to regulate pro-inflammatory cytokine production

Poster session 1, September 21, 2022, 12:30 PM - 1:30 PMObjectivesLong pentraxin-3 (PTX3) is a soluble pattern-recognition receptor secreted by phagocytes and non-immune cells at sites of inflammation. It has been reported to have a nonredundant role in the immune response against Aspergillus fumigatus. Indeed, PTX3 knock-out mice show an increased susceptibility to invasive pulmonary aspergillosis (IPA) with a higher mortality rate. In humans, PTX3 genetic deficiency or single nucleotide polymorphism has also been associated with an increased risk of IPA. However, the way in which PTX3 interacts with A. fumigatus and its mechanism of action has yet to be elucidated. The aim of the study was to investigate potential A. fumigatus ligands for PTX3 and the impact of A. fumigatus opsonization by PTX3 on modulating the immune response.Methods Aspergillus fumigatus conidia, the infective morphotype, were incubated with PTX3 with or without human serum, stained with anti-PTX3 antibody, and studied by immunofluorescence. Identification of potential fungal ligands for PTX3 was performed by ELISA. Fixed conidia and germinated conidia were opsonized with different serum factors and co-incubated with human monocyte-derived macrophages (hMDM) for 24 h at 37°C. Culture supernatants were collected, and pro-/anti-inflammatory cytokines were measured by sandwich ELISA.ResultsPTX3 did not bind A. fumigatus conidia directly but in the presence of human serum, purified collectins [surfactant protein D (SP-D) or C1q], and complement products (C3b). Pre-opsonization of conidia with these complement proteins or SP-D stimulated proinflammatory cytokine secretion by hMDM upon interaction (Fig. 1a). In contrast, secondary opsonization of complement proteins or SP-D opsonized conidia with PTX3 significantly reduced pro-inflammatory cytokines and increased anti-inflammatory cytokine secretion from hMDM. PTX3 opsonized PFA-fixed germinating conidia significantly reduced pro-inflammatory cytokine and increased anti-inflammatory cytokines secretion from hMDM (Fig. 1b).ConclusionPTX3 is an acute phase protein expressed in response to pro-inflammatory stimuli during infection and that is increased in bronchoalveolar lavage of patients with aspergillosis. Our recent data with A. fumigatus suggest that PTX3 is an immunoregulatory protein that reduces pro-inflammatory response. Although an inflammatory response is necessary to fight against fungal pathogens, the tissue damage associated with enhanced inflammation can be deleterious and facilitate A. fumigatus infection.

Molecular detection and genotype identification of Acanthamoeba species from bronchoalveolar lavage of patients with pulmonary symptoms suspected of cancer.

Acanthamoeba spp. are the most common free-living amoeba worldwide, inducing life-threatening diseases such as Granulomatous Amoebic Encephalitis, pulmonary infection, and amoebic keratitis. This study aimed to identify the FLA and Acanthamoeba genotypes in patients with pulmonary symptoms suspected of cancer in Kashan's hospitals, Kashan, Iran. This cross-sectional study was conducted on 97 bronchoalveolar lavage samples of patients with respiratory symptoms suspected of lung cancer, who were admitted to the Shahid Beheshti Hospital of Kashan from 2019 to 2020. The samples were cultured onto 1.5% non-nutrient agar enriched with killed Escherichia coli and examined for the presence of FLA. Following amoeba isolation and DNA extraction, Acanthamoeba spp. were determined by Polymerase Chain Reaction using JDP1 and JDP2 primers, which amplified a 490bp fragment from the 18 S rDNA gene. Eighteen Acanthamoeba isolates were sequenced, and the genotypes were identified. The prevalence of FLA and Acanthamoeba and the relationship between symptoms and demographic variables were analyzed with SPSS Software version 16. The prevalence rates of FLA and Acanthamoeba in the BAL samples was 86.6% and 73.2%, respectively. All Acanthamoeba isolates belonged to the T4 genotype. The most symptoms among Acanthamoeba-positive patients were dyspnea and cough; however, their difference was not statistically significant. The findings indicated the high prevalence of FLA and Acanthamoeba in BAL in the population suspected of cancer in Kashan. Since the T4 genotype is a pathogenic genotype of Acanthamoeba, training health and improving sanitation levels would help to prevent infection.

Diagnostic Role of Bronchoalveolar Lavage in Patients with Suspected SARS-CoV-2 Pneumonia and Negative Upper Respiratory Tract Swab: A Systematic Review and Meta-Analysis.

The added role of bronchoalveolar lavage (BAL) in SARS-CoV-2 detection in hospitalized patients with suspected COVID-19 pneumonia and at least one negative nasopharyngeal swab (NPS) has yet to be definitively established. We aimed to provide a systematic review and meta-analysis to summarize data from the literature on the diagnostic yield of BAL in this context. We searched Medline and Embase for all studies reporting outcomes of interest published up to October 2021. Two authors reviewed all titles/abstracts and retrieved the selected full texts according to predefined selection criteria. The summary estimate was derived using the random-effects model. Thirteen original studies, involving 868 patients, were included. The summary estimate of proportions of SARS-CoV-2 positivity in BAL fluid in patients with at least one previous negative NPS was 20% (95% confidence interval [CI]; 11–30%). Moreover, microbiological tests of BAL fluid led to the identification of other pathogens, mainly bacteria, in up to two-thirds of cases. BAL plays a crucial role in the diagnostic work-up of patients with clinical suspicion of COVID-19 and previous negative NPS, as it allowed to detect the infection in a significant proportion of subjects, who would have been otherwise misclassified, with relevant implications in the prevention of disease spread, especially in hospital settings.

Diagnostic Utility of Bronchoalveolar Lavage in Patients with Acute Leukemia under Broad-Spectrum Anti-Infective Treatment.

Simple SummaryInfections of bacterial, viral, or fungal origin pose a major threat to patients with acute leukemia. Empiric antibiotic and antifungal treatment is a commonly used approach in leukemia patients with febrile neutropenia. To investigate the utility of flexible bronchoscopy (FB) with bronchoalveolar lavage (BAL) in acute leukemia (AL) patients with pneumonia who were already treated with broad-spectrum antibiotics and antifungal agents, we investigated bronchoalveolar samples of 88 patients. Our results indicate that despite broad-spectrum anti-infective treatment, in approximately half of all patients, pathogens could still be isolated in bronchoalveolar samples. Nevertheless, the detection of pathogens does not lead to frequent changes in anti-infective treatments, with most changes performed in patients with herpes simplex and influenza virus detection, and these pathogens might also be detected in less invasive examinations. The need for FB with BAL in patients with AL who are already receiving broad-spectrum empiric anti-infective treatment should therefore be weighed carefully.Despite therapeutic advances in the prevention and treatment of febrile neutropenia, acute leukemia (AL) patients still have considerable febrile neutropenia-related mortality. However, the diagnostic yield of flexible bronchoscopy (FB) and bronchoalveolar lavage (BAL) in acute leukemia patients is unclear. In this retrospective single-center study, we analyzed 88 BAL samples of patients with acute leukemia and pulmonary infiltrates in spite of treatment with broad-spectrum anti-infective agents. The aim was to investigate the impact of FB with BAL on detecting causative organisms, which would result in a change in treatment regimens. The median age was 59 years, and 86% had acute myeloid leukemia. In 47%, pathogens were detectable in BAL fluid (pathogen bacteria, viruses, and fungi in 2, 15, and 18%, respectively), with Aspergillus fumigatus detected most frequently. BAL-guided anti-infective therapy changes were performed in 15%. The detection of herpes simplex and influenza viruses were the main reasons for treatment changes. Despite broad-spectrum anti-infective treatment, in approximately half of all patients, pathogens could still be isolated in BAL samples. However, consecutive changes in anti-infective treatment were considerably less frequent, with most changes performed in patients with Herpes simplex virus and Influenza A detection. The need for FB with BAL in patients with AL receiving broad-spectrum empiric anti-infective treatment should therefore be weighed carefully.

Study of the diagnostic utility of paraoxonase enzyme in serum and bronchoalveolar lavage in patients with lung cancer

Study of the diagnostic utility of paraoxonase enzyme in serum and bronchoalveolar lavage in patients with lung cancer

Electrical Impedance Tomography Monitoring of Bronchoalveolar Lavage in Patients With Acute Respiratory Distress Syndrome.

The impact of bronchoalveolar lavage on regional ventilation in mechanically ventilated patients with acute respiratory distress syndrome has rarely been described. Our objectives were use electrical impedance tomography to describe lung impedance variation post bronchoalveolar lavage and identify morphologic patterns according to respiratory failure severity. Monocenter physiologic study on mechanically ventilated patients. University medical ICU. After a recruitment maneuver, tidal impedance variation distributions (a surrogate for impact of bronchoalveolar lavage on tidal volume distribution), end-expiratory lung impedance (correlated with end-expiratory lung volume and used to quantify postbronchoalveolar lavage derecruitment), respiratory mechanics, and blood gases were recorded before and over 6 hours post bronchoalveolar lavage with Pao2 to the Fio2 ratio. Patients were grouped according to their prebronchoalveolar lavage, that is, Pao2 to the Fio2 ratio less than 200 or greater than or equal to 200. Twenty-one patients (median [interquartile range] age 55 yr [50-58 yr]; 13 males), 13 with Pao2 to the Fio2 ratio less than 200, were included. Unlike that latter group, bronchoalveolar lavage significantly impacted tidal impedance variation distribution in patients with Pao2 to the Fio2 ratio greater than or equal to 200, with a ventilation shift to the contralateral lung (from 54% to 42% in the bronchoalveolar lavage side), which persisted up to 6 hours post bronchoalveolar lavage. Similarly, end-expiratory lung impedance was less distributed in the bronchoalveolar lavage side post procedure of patients with Pao2 to the Fio2 ratio greater than or equal to 200, but the difference did not reach statistical significance (p = 0.09). As reported for tidal impedance variation, end-expiratory lung impedance distribution in patients with severe or moderate acute respiratory distress syndrome did not change significantly during the 6 hours post bronchoalveolar lavage. Although bronchoalveolar lavage effects on gas exchanges were minor in all patients, static compliance in patients with Pao2 to the Fio2 ratio greater than or equal to 200 was significantly lower post bronchoalveolar lavage (p = 0.04). The negative impact of bronchoalveolar lavage on regional ventilation, which persisted at least 6 hours, appeared to be more profound in patients with normal lung function or mild acute respiratory distress syndrome. In contrast, regional ventilation, lung recruitment, respiratory mechanics, and gas exchanges were modestly impacted by the bronchoalveolar lavage in patients with severe or moderate acute respiratory distress syndrome. That finding is reassuring and supports not summarily proscribing bronchoalveolar lavage for the most severely ill with acute respiratory distress syndrome.

Broncho-alveolar lavage in patients with acute respiratory distress syndrome due to COVID-19.

As data about microbiological testing and the cellular composition of the broncho‐alveolar lavage (BAL) fluid in patients ventilated due to coronavirus disease 2019 (COVID‐19) are lacking, this was investigated in a retrospective analysis (n = 58). Co‐infection with pathogens was detected in 31 patients, whereas the analysis of BAL cellularity showed an increased total cell count and an alveolitis dominated by neutrophils. None of the physicians performing bronchoscopies in COVID‐19 patients had serological evidence of severe acute respiratory syndrome coronavirus 2 infection.

EGFR mutation status yield from bronchoalveolar lavage in patients with primary pulmonary adenocarcinoma compared to a venous blood sample and tissue biopsy.

BackgroundIn recent years, there has been a revolution in the genomic profiling and molecular typing of lung cancer. A key oncogene is the epidermal growth factor receptor (EGFR). The gold standard for determining EGFR mutation status is tissue biopsy, where a histological specimen is taken by a bronchoscopic or surgical method (transbronchial biopsy, forceps biopsy, etc.). However, in clinical practice the tissue sample is often insufficient for morphological and molecular analysis. Bronchoalveolar lavage is a validated diagnostic method for pathogenic infections in the lower respiratory tract, yet its diagnostic value for oncogenic mutation testing in lung cancer has not been extensively investigated. This study aims to compare the prevalence of EGFR mutation status in bronchoalveolar lavage and peripheral blood referring to the gold standard - tissue biopsy in patients with primary lung adenocarcinoma.MethodsTwenty-six patients with adenocarcinoma were examined for EGFR mutation from tissue biopsy, peripheral blood sample and bronchoalveolar lavage.ResultsThirteen patients had wild type EGFR and the other 13 had EGFR mutation. EGFR mutation from a peripheral blood sample was identified in 38.5% (5/13) of patients, whereas EGFR mutation obtained from bronchoalveolar lavage (BAL) was identified in 92.3% (12/13). This study demonstrates that a liquid biopsy sample for EGFR status from BAL has a higher sensitivity compared to a venous blood sample.

Risk factors for acute exacerbation following bronchoalveolar lavage in patients with suspected idiopathic pulmonary fibrosis: A retrospective cohort study.

Bronchoalveolar lavage (BAL) is useful for diagnosing diffuse lung disease and excluding other conditions. However, acute exacerbations (AEs) are recognized as important complications of BAL in patients with idiopathic pulmonary fibrosis (IPF). This study aimed to identify risk factors for BAL-induced AEs in patients with IPF. We retrospectively analyzed the data of 155 patients with suspected IPF who had undergone BAL between January 2013 and December 2018. BAL-related AE was defined as the development of AE within 30 days after the procedure. We compared clinical features and parameters between patients with AE (AE group) and without AE (non-AE group). We also reviewed the relevant reported literature. Among the 155 patients, 5 (3.2%) developed AE within 30 days after BAL. The average duration from BAL to AE onset was 7.8 days (2-16 days). Results from the univariate analysis revealed PaO2 < 75 mm Hg (p = 0.036), neutrophil content in BAL ≥ 7% (p = 0.0061), %DLCO < 50% (p = 0.019), Gender-Age-Physiology (GAP) stage III (p = 0.034), and BAL recovery rates < 30% (p < 0.001) as significant risk factors for post-BAL AE. All five patients who developed AE recovered and were discharged. Disease severity, high neutrophil levels in BAL, and poor BAL recovery rates may be risk factors for BAL-induced AEs.

Pre-Procedural COVID-19 Nasopharyngeal Swab Has Good Concordance with Bronchoalveolar Lavage in Patients at Low Risk for Viral Infection

Background: The coronavirus disease 2019 (COVID-19) pandemic has drastically affected hospital and operating room (OR) workflow around the world as well as trainee education. Many institutions have instituted mandatory preoperative SARS-CoV-2 PCR nasopharyngeal swab (NS) testing in patients who are low risk for COVID-19 prior to elective cases. This method, however, is challenging as the sensitivity, specificity, and overall reliability of testing remains unclear. Objectives: The objective of this study was to assess the concordance of a negative NS in low risk preoperative patients with lower airway bronchoalveolar lavage (BAL) specimens obtained from the same patients. Methods: We prospectively sent intraoperative lower airway BAL samples collected within 48 h of a negative mandatory preoperative NS for SARS-CoV-2 PCR testing. All adult patients undergoing a scheduled bronchoscopic procedure for any reason were enrolled, including elective and nonelective cases. Results: One-hundred eighty-nine patients were included. All BAL specimens were negative for SARS-CoV-2 indicative of 100% concordance between testing modalities. Conclusions: These results are promising and suggest that preoperative nasopharyngeal SARS-CoV-2 testing provides adequate screening to rule out active COVID-19 infection prior to OR cases in a population characterized as low risk by negative symptom screening. This information can be used for both pre-procedural screening and when reintroducing trainees into the workforce.