Langerhans Cell Histiocytosis Presenting with Pneumothorax and Diabetes Insipidus.

Secondary spontaneous pneumothoraces occur in patients with known underlying lung disease. Patients with emphysema, bullae, and cystic lesions in the lungs are at high risk of developing pneumothorax. Cystic lung diseases like Langerhans cell histiocytosis (LCH) can present with complications like pneumothorax. Other common presenting features include maculopapular rashes and bone lesions. It can also be associated with endocrinopathies, most commonly central diabetes insipidus (CDI). We here present a case of a 22-year-old male who presented with pneumothorax, polyuria, and polydipsia. He was diagnosed with LCH on transbronchial lung biopsy, associated with CDI, and was treated with thoracoscopy-guided autologous blood patch for persistent air leak and subcutaneous cytarabine.

Radial Endobronchial Ultrasound to Diagnose a Case of Non-Hodgkin's Lymphoma in the Lung: A Case Report and Literature Review.

Non-Hodgkin's lymphomas (NHLs) are a heterogeneous group of lymphoproliferative malignancies that are very rarely seen in the lung. Although they generally have a favorable prognosis, the clinical symptoms and most efficient methods of diagnosis have not yet been clearly defined. This report highlights an interesting case wherein a 75-year-old male who presented with complaints of fever, cough, and generalized weakness for three weeks was diagnosed and treated as a case of pneumonia. He did not respond to conventional treatment with antibiotics and antipyretics. Hence, computed tomography of the thorax was done which showed consolidation in the right lower lobe along with a few enlarged right hilar nodes. To evaluate this unresolved pneumonia, he was further evaluated with a radial endobronchial ultrasound (EBUS) and biopsy, which helped in arriving at a diagnosis of NHL. This case illustrates the significance of advanced interventions such as radial EBUS to identify the exact etiology of the lesions. This is the first case to document the ultrasound images of NHL in the lung, obtained using a radial EBUS.

Thoracoscopic blood patch instillation for persistent air leak in pneumothorax: a case series and systematic review.

Persistent air leaks in patients with pneumothorax can lead to significant morbidity. If a patient with persistent air leak is medically unfit for thoracic surgery, medical pleurodesis via chest tube or thoracoscopy is either an option. Thoracoscopy offers the advantage of visualizing the site of the air leak and enabling direct instillation of the pleurodesis agent or glue at that location. Autologous blood patch instillation via chest tube has been reported to be a cheap and very effective technique for the management of persistent air leaks. However, thoracoscopic blood patch instillation has not been reported in the literature. We report two cases of secondary spontaneous pneumothorax in which patients had persistent air leaks for more than seven days and were subjected to thoracoscopy to locate the site of the leak. In the same sitting, 50 mL of autologous blood patch was instilled directly at the leak site. Post-procedure, the air leak subsided in both patients, and the chest tube was removed with complete lung expansion. We also conducted a systematic review of the use of medical thoracoscopic interventions for treating persistent air leaks.

Cryodebulking to Relieve Critical Airway Narrowing Due to a Central Airway Tumor at the Carina: A Case Report and Literature Review.

Central airway tumors presenting as critical airway stenosis is a medical emergency. Employing a cryoprobe, we successfully debulked a central airway tumor, providing rapid relief to a patient who came to the emergency room with severe breathlessness, hemoptysis, and respiratory failure. The current report underscores the efficacy of cryodebulking as an immediate and minimally invasive technique and a compelling alternative to conventional heat-based therapies.

Comparative yield of transbronchial cryo-nodal biopsy, transbronchial intra-nodal forceps biopsy, and transbronchial needle aspiration for mediastinal lesions at a tertiary care center in India (COLD-FORCEPS study).

Endobronchial ultrasound (EBUS) guided mediastinal cryobiopsy, and intranodal forceps biopsy are newer modalities for sampling mediastinal lymph nodes. The data regarding the diagnostic yield of both modalities is scarce. Patients were recruited retrospectively from our existing database. Patients who had undergone both an EBUS guided mediastinal cryobiopsy and an intranodal forceps biopsy were enrolled in the study. The final diagnosis was made with a clinical-pathological-radiological assessment and clinico-radiological follow-up after one month. A total of 34 patients were enrolled in the study who had undergone both EBUS guided mediastinal cryobiopsy and intranodal forceps biopsy and had complete data available, including 1-month follow-up data. The sample adequacy rate of EBUS-transbronchial needle aspiration (EBUS-TBNA), EBUS-TBNA with mediastinal cryobiopsy, and EBUS-TBNA with intranodal forceps biopsy was 94.11%, 97.05%, and 94.11%, respectively (p=0.56). The diagnostic yield achieved in EBUS-TBNA, EBUS-TBNA with mediastinal cryobiopsy, and EBUS-TBNA with intranodal forceps biopsy was 73.52%, 82.35%, and 79.41%, respectively (p=0.38). No major complications were seen in any patient. To conclude, adding EBUS guided mediastinal cryobiopsy and intranodal forceps biopsy to EBUS-TBNA may not be superior to routine EBUS-TBNA.

Clinical utility of intrabronchial antifungal instillation in a complicated case of chronic pulmonary aspergillosis: case report and systematic review of literature.

Chronic pulmonary aspergillosis (CPA) is a progressive, debilitating clinical condition associated with significant morbidity. Surgery is the mainstay of treatment for life-threatening hemoptysis in symptomatic patients with simple aspergillomas. However, in patients with chronic cavitary pulmonary aspergillosis, surgical removal of aspergillomas is fraught with difficulty due to debilitating nature of the illness. Here we present a case showcasing the utility of intrabronchial voriconazole instillation in controlling hemoptysis in a patient unfit for surgery followed by systematic review of literature involving 11 clinical studies after screening a total of 5572 studies from PubMed and Google Scholar database. Data gathered from these studies addresses the concerns regarding the efficacy, safety of the procedure as well as draws attention regarding several lacunae in our existing knowledge. A 53-year-old male with chronic pulmonary aspergillosis who had recurrent episodes of hemoptysis despite bronchial artery embolization and was unfit for surgery due to limited lung reserve, patient underwent single session of intrabronchial voriconazole instillation which resulted in dramatic symptomatic and radiological improvement. Intrabronchial antifungal instillation may be a safe and effective option for hemoptysis control in patients with chronic pulmonary aspergillosis.

Pre-conference workshop on pulmonary rehabilitation and smoking cessation - NATCON 2022.

The 77th National Conference of Tuberculosis and Chest Diseases was held on 27th February 2023. The workshop on Pulmonary rehabilitation and smoking cessation was conducted as a part of the various pre-conference workshops being conducted on the occasion. It helped the participants to know regarding the role, efficacy and benefits of pulmonary rehabilitation and smoking cessation for the management of Chronic respiratory diseases.

A 33-Year-Old Woman With Breathing Difficulty, Inspiratory Wheeze, and Hemoptysis.

CASE PRESENTATION: A 33-year-old teacher from Ghana with no medical comorbidities and no relevant family history came to our pulmonology department with progressive difficulty in breathing, wheezing, and stridor for 6 months. Similar episodes had been treated previously as bronchial asthma. She was being treated with high-dose inhaled corticosteroids and bronchodilators but had no relief. The patient also described two episodes of large quantities of hemoptysis (> 150 mL) in the previous week. A general physical examination revealed a tachypneic young woman with an audible inspiratory wheeze. Her BP was 128/80 mm Hg; pulse, 90 beats/min; and respiratory rate, 32 breaths/min. There was a hard, minimally tender, nodular swelling of 3 × 3 cm in the midline neck felt just below the cricoid cartilage, moving with deglutition and protrusion of the tongue, with no retrosternal extension. There was no cervical or axillary lymphadenopathy. Laryngeal crepitus was present.

Multimodal analysis of the COVID-19-associated mucormycosis outbreak in Delhi, India indicates the convergence of clinical and environmental risk factors.

BACKGROUND: The aetiology of the major outbreak of COVID-19-associated mucormycosis (CAM) in India in spring 2021 remains incompletely understood. Herein, we provide a multifaceted and multi-institutional analysis of clinical, pathogen-related, environmental and healthcare-related factors during CAM outbreak in the metropolitan New Delhi area. METHODS: We reviewed medical records of all patients diagnosed with biopsy-proven CAM (n = 50) at 7 hospitals in the New Delhi, and NCR area in April-June 2021. Two multivariate logistic regression models were used to compare clinical characteristics of CAM cases with COVID-19-hospitalised contemporary patients as controls (n = 69). Additionally, meteorological parameters and mould spore concentrations in outdoor air were analysed. Selected hospital fomites were cultured. Mucorales isolates from CAM patients were analysed by ITS sequencing and whole-genome sequencing (WGS). RESULTS: Independent risk factors for CAM identified by multivariate analysis were previously or newly diagnosed diabetes mellitus, active cancer and severe COVID-19 infection. Supplemental oxygen, remdesivir therapy and ICU admission for COVID-19 were associated with reduced CAM risk. The CAM incidence peak was preceded by an uptick in environmental spore concentrations in the preceding 3-4 weeks that correlated with increasing temperature, high evaporation and decreasing relative humidity. Rhizopus was the most common genus isolated, but we also identified two cases of the uncommon Mucorales, Lichtheimia ornata. WGS found no clonal population of patient isolates. No Mucorales were cultured from hospital fomites. CONCLUSIONS: An intersection of host and environmental factors contributed to the emergence of CAM. Surrogates of access to advanced COVID-19 treatment were associated with lower CAM risk.

Clinico-epidemiological profile of COVID-19 patients admitted during third wave of pandemic in a tertiary care hospital in New Delhi, India.

Even nearly two years after the first reported case, the novel coronavirus (SARS-CoV-2) continues to ebb and flow around the world. A retrospective cohort study was carried out to determine the clinico-epidemiological profile and outcome of the cases. The study analyzed secondary data from 827 patients who presented to our center with COVID-19-related illnesses between December 15, 2021, and February 15, 2022 (third wave in India). There was a significant difference in the vaccination status of patients treated at home and those admitted, with 87.9% having received two doses compared to 74% in the second group being unvaccinated. Patients who were isolated at home recovered at a rate of 99.4%, while hospitalized patients died at a rate of 26.5%. Vaccination reduces the severity of COVID-19; however, constant vigilance for new variants, precautionary measures, and increased vaccination drives are critical moving forward.   *Other members of the Safdarjung Hospital COVID-19 working group: B. Lal (Medicine), Harish Sachdeva (Anaesthesiology), Santvana Kohli (Anaesthesiology), Amandeep Jaswal (Anaesthesiology), Sumitra Bachani (Obstetrics and Gynecology), Ajay Kumar (Pediatrics), Rohit Kumar (Pulmonary Medicine), Vidya Sagar Chaturvedi (Surgery), Vinod Chaitanya (Medicine).

Correlating Ultrasonographic Features of Lymph Nodes During Endobronchial Ultrasound With Final Outcome.

Background In clinical practice, metastatic primary lung cancer, TB, and sarcoidosis are the commonest causes of mediastinal lymphadenopathy. Differentiation of malignant from benign causes is essential. The sonographic features seem to correlate with malignancy in head and neck, breast, and cervix cancers and can be used to predict the etiology of lesions. The objective of our study was to assess the utility of different ultrasonographic features in differentiating benign and malignant lymph nodes by endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA). Methods This is a prospective study analysis of all patients above 18 years presenting with mediastinal and hilar adenopathy on computed chest tomography with contrast, undergoing EBUS-TBNA for diagnosis. Lymph node ultrasonographic characteristics such as size, shape, echogenicity, margins, central hilar structure (CHS), and coagulation necrosis sign (CNS) were recorded and compared with histopathology. Results A total of 576 patients underwent the EBUS-TBNA procedure, and a total of 810 lymph nodes were evaluated. Three hundred and forty-eight patients (468 lymph nodes) were malignant; 228 patients (342 lymph nodes) were benign. Heterogeneous echotexture was significantly higher in malignant lymph nodes (<0.001). The multivariate analysis revealed that heterogeneous echotexture was an independent predictor for malignant etiology. Conclusion Heterogeneous echotexture of the lymph node on EBUS was predictive of malignancy. If heterogenicity is observed on EBUS, subsequent sampling of that lymph node might be considered, which may yield a higher diagnostic yield and may reduce the number of lymph nodes requiring sampling and further invasive procedures.

Role of low dose computed tomography on lung cancer detection and mortality - an updated systematic review and meta-analysis.

Chest low dose computed tomography (LDCT) is reported to be a sensitive tool for the detection of lung cancer at asymptomatic stage, thus reducing mortality. The review assesses the effect of LDCT screening on all-cause mortality, lung cancer mortality and incidence rates. We conducted literature searches of PubMed, SCOPUS, and the Cochrane Library from inception through January 2020 to identify relevant studies assessing the diagnostic accuracy of LDCT for lung cancer. We used Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines for reporting this meta-analysis and review. The inclusion criteria were a) Randomized control trials, b) Comparing LDCT to any other form of screening or standard of care, and (c) Primary outcome studied: all-cause mortality, lung cancer-specific mortality, rate of early detection of lung cancer. A total of 11 studies encompassing 97,248 patients were included. When compared with controls (no screening or CXR), LDCT screening was associated with statistically significant reduction in lung cancer mortality (pooled RR 0.86; 95% CI 0.75-0.98); low heterogeneity was observed (I2= 27.86). However, LDCT screening was not associated with statistically significant reduction in all-cause mortality (RR =0.96; 95% CI: 0.92 -1.01). Notably, the LDCT screening was associated with statistically significant increase in lung cancer detection (RR =1.76; 95% CI: 1.14-2.72). LDCT screening has the potential to reduce mortality due to lung cancer among high-risk individuals. LDCT could be considered as a screening modality after careful assessment of other factors like prevalence of TB, proportion of high-risk population, cost, access and availability of LDCT.

Endobronchial ultrasound-guided transbronchial cryo-nodal biopsy: a novel approach for mediastinal lymph node sampling.

Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is preferred for evaluating malignant lymph nodes and staging of lung cancer. Nevertheless, larger tissue samples are increasingly needed, particularly for molecular analysis. We describe the feasibility, technical details, and complications of EBUS-guided transbronchial cryo-node biopsy (TBCNB) in four patients with mediastinal adenopathy. The samples obtained by EBUS-TBCNB in all cases were adequate for histopathological examination (HPE) and immunohistochemistry (IHC) staining. In case 1, HPE showed non-caseating epithelioid granuloma with giant cells and fibrosis consistent with sarcoidosis. Case 2 was diagnosed with adenocarcinoma with positivity for ROS1(D4D6). Case 3 showed features of metastatic adenocarcinoma from the breast (positive for Her2, ER, and GATA3). Case 4 was diagnosed with tuberculosis (necrotizing granuloma in histopathology, stain with Ziehl-Neelsen that showed few rod-shaped bacilli). Only one patient had minimal bleeding at the puncture site controlled with cold saline. There were no adverse events such as major bleeding, pneumomediastinum, or pneumothorax.

Risk factors and frequency of COVID-19 among healthcare workers at a tertiary care centre in India: a case-control study.

BACKGROUND: There is a paucity of data on risk factors for infection among healthcare workers (HCWs) from India. Our objective was to evaluate the risk factors and frequency of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection among HCWs. METHODS: We conducted this retrospective case-control study of 3100 HCWs between May and July 2020. HCWs positive for SARS-CoV-2 infection were the cases (n=506) and those negative for SARS-CoV-2 were the controls (n=253). Univariate analysis was followed by multivariate analysis of key demographic, clinical and infection control variables. RESULTS: SARS-CoV-2 infection was found in 16.32% of HCWs. Nearly 45% of infected HCWs were asymptomatic. The proportions of sanitation workers (24% vs 8%; p<0.0001) and technicians (10% vs 4%; p=0.0002) were higher and that of doctors was lower among cases as compared with controls (23% vs 43%; p<0.0001). On univariate analysis, the type of HCW, smoking, lack of training, inadequate personal protective equipment (PPE) use and taking no or fewer doses of hydroxychloroquine (HCQ) were found to be significant. On multivariate analysis, the type of HCW (risk ratio [RR] 1.67 [95% confidence interval {CI} 1.34 to 2.08], p<0.0001), inappropriate PPE use (RR 0.63 [95% CI 0.44 to 0.89], p=0.01) and taking fewer doses of HCQ (RR 0.92 [95% CI 0.86 to 0.99], p=0.03) were significant. CONCLUSIONS: The frequency of SARS-CoV-2 infection was 16% among HCWs. Being a sanitation worker, inappropriate PPE use and lack of HCQ prophylaxis predisposed HCWs to SARS-CoV-2 infection.

Improved Stabilities of Labeling Probes for the Selective Modification of Endogenous Proteins in Living Cells and In Vivo.

To date, various affinity-based protein labeling probes have been developed and applied in biological research to modify endogenous proteins in cell lysates and on the cell surface. However, the reactive groups on the labeling probes are also the cause of probe instability and nonselective labeling in a more complex environment, e. g., intracellular and in vivo. Here, we show that labeling probes composed of a sterically stabilized difluorophenyl pivalate can achieve efficient and selective labeling of endogenous proteins on the cell surface, inside living cells and in vivo. As compared with the existing protein labeling probes, probes with the difluorophenyl pivalate exhibit several advantages, including long-term stability in stock solutions, resistance to enzymatic hydrolysis and can be customized easily with diverse fluorophores and protein ligands. With this probe design, endogenous hypoxia biomarker in living cells and nude mice were successfully labeled and validated by in vivo, ex vivo, and immunohistochemistry imaging.

Evidence-based review of bronchoscopic lung volume reduction.

Emphysema sequentially leads to the loss of gas exchanging surface and an abnormal shape of the diaphragm generating dyspnea refractory to standard medical therapy. Lung volume reduction surgery (LVRS) is a surgical treatment option for patients with severe emphysema whose symptoms are uncontrolled on standard therapy. Bronchoscopic LVR (bLVR) is a process by which lung volume reduction is achieved in a minimally invasive manner using bronchoscopy-guided insertion of valves, coils, sealants, or by thermal vapour ablation like techniques. These therapies have developed over the last few years and have variable results in patients. We have summarized the current evidence available on each of these methods in this review.

A 22-Year-Old Man With Back Pain, Dilated Veins Over Chest, and Mass in Right Atrium.

CASE PRESENTATION: A 22-year-old nonsmoker male, without any previous comorbidity, presented with 4 months' history of right upper back pain. Pain was constant dull aching type, nonpleuritic, aggravated by lying on the right lateral side and partially relieved on taking analgesics. He then developed progressive dyspnea over 2 months and noticed dilated veins over his neck and front of chest. There was associated unintentional weight loss of 6 kg. There was no history of cough, expectoration, wheeze, or hemoptysis, nor any episodes of night sweats or fever.

Self-Immolative Difluorophenyl Ester Linker for Affinity-Based Fluorescence Turn-on Protein Detection.

Currently most fluorogenic probes are developed for the analysis of enzymes, where a bond breaking or rearrangement reaction is required to transform a nonfluorescent enzymatic substrate into a fluorescent product. However, this approach cannot be used for proteins that do not possess enzymatic activities. In this article, we show that fluorogenic probes with a self-immolative difluorophenyl ester linker can mimic the bond disassembly processes of fluorogenic enzyme substrates for the rapid analysis of nonenzymatic proteins. Although numerous self-immolative reagents have shown promising applications in sensors, drug delivery systems, and material chemistry, all of them are triggered by either enzymes or small reactive molecules. In our strategy, the probe binds to the protein via a specific protein-ligand interaction, inducing a chemical reaction between the self-immolative linker and an amino acid of the protein, thereby triggering a cascade reaction that leads to the activation and release of the fluorogenic reporter. In contrast, a phenyl ester linker without the difluoro substituent cannot be triggered to release the fluorogenic reporter. With this probe design, live-cell imaging of extracellular and intracellular endogenous tumor marker proteins can be achieved with high selectivity and sensitivity.