Current Respiratory Medicine Reviews - Online First
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Mandibular Advancement Devices’ Efficacy in Treating Obstructive Sleep Apnea - An Overview of Clinical Data
Available online: 24 June 2025More LessBackgroundComplete or partial collapse of the upper airway for a few seconds during sleep is the cause of obstructive sleep apnea (OSA). OSA affects about half of the world's population. Although there are numerous treatment options for OSA, continuous positive airway pressure (CPAP), mandibular advancement device (MAD), and surgeries are regarded as mainstream therapies.
ObjectiveSince MAD is a better alternative to CPAP for patients who are unwilling to utilize CPAP therapy or who do not comply with it, our current review focuses on how effective MAD is at managing OSA.
MethodsTo find publications relevant to the safety and effectiveness of MAD in the treatment of OSA, online databases such as Medline/PubMed/PMC, Scopus, Web of Science, Google Scholar, and reference lists were searched.
ResultsThrough the reduction of apnea-hypopnea index (AHI), snoring, and improved sleep quality, a number of prospective and retrospective observational studies, randomized controlled clinical trials and meta-analyses showed that MADs are beneficial for patients with mild-to-moderate OSA and snoring. Although CPAP therapy is the gold standard for treating OSA, patients who cannot or do not want to utilize CPAP therapy may benefit from MAD therapy as an alternative or as a supplementary treatment. For patients with OSA, the use of oral appliances, including MAD, is advised by the American Academy of Sleep Medicine (AASM), American Academy of Dental Sleep Medicine (AADSM), and National Institute of Clinical Excellence (NICE) guidelines.
ConclusionNumerous randomized controlled clinical trials, prospective and retrospective observational studies, and meta-analyses have demonstrated that MADs are beneficial in treating OSA patients by reducing snoring, enhancing sleep quality, and lowering the apnea-hypopnea index (AHI). A licensed dentist should utilize a custom, titratable MAD when a sleep physician prescribes oral appliance therapy for an adult patient with OSA. The patients managed with MAD therapy should be advised to pay follow-up visits.
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Recent Advances in HMPV: The Silent Threat to Respiratory Health
Authors: Dinesh Kumar, Vrinda Gupta, Rajni Tanwar and Nicky Kumar JaiswalAvailable online: 24 June 2025More LessHMPV represents a major cause of respiratory illness particularly among vulnerable populations, first discovered in 2001 by Dutch researchers. Retrospective studies have revealed its silent circulation since the 1950s, with genetic evidence suggesting an ancestral link to avian metapneumovirus (AMPV) through a zoonotic transmission event. HMPV is a member of the Paramyxoviridae family and is genetically stable, with two primary lineages, A and B, circulating globally. It is a common cause of seasonal respiratory infections, particularly affecting infants, the elderly, and immunocompromised individuals, often leading to bronchiolitis, pneumonia, and hospitalization. The virus peaks in late winter and early spring, imposing a significant public health and economic burden. Current management involves supportive care, with no approved vaccines or antiviral treatments available. However, promising advancements in vaccine development and monoclonal antibody research provide hope for future prevention and therapeutic strategies. Increased surveillance, public health awareness, and continued research are essential for controlling HMPV's impact.
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Illuminating the Role of Vitamin D in Long COVID: A Narrative Review of its Impact on Recovery, Immunity, and Beyond
Authors: Sumbal Riaz, Amina Abdul Gafoor, Asiya Mubeen, Fiza Halima, Afra Jaffarsadiq and Sadaf MajeedAvailable online: 10 June 2025More LessLong COVID, or post-COVID syndrome, has emerged as a significant public health challenge, leaving countless individuals with lingering symptoms such as fatigue, breathlessness, and neuropsychiatric issues. Recent evidence suggests a potential role for Vitamin D in alleviating these symptoms, given its anti-inflammatory, immunomodulatory, and neuroprotective properties. Vitamin D’s ability to modulate cytokine storms, enhance antiviral defenses, and support tissue repair highlights its potential for addressing the complex, multi-system effects of Long COVID. This narrative review examines the link between Vitamin D deficiency and the risk of developing Long COVID or experiencing severe COVID-19 (Coronavirus disease 2019) outcomes while also exploring the effectiveness of Vitamin D supplementation in reducing symptom severity and duration in affected individuals. Findings from several observational studies and clinical trials reached varying conclusions. While some studies link lower Vitamin D levels to an increased risk or severity of Long COVID, others report no significant correlation. Furthermore, current clinical trials investigating supplementation indicate potential benefits, including reduced disease severity, lower mortality rates, and improved recovery outcomes, particularly in individuals with pre-existing deficiencies. However, inconsistencies in the structure of clinical trials drive a need for further standardized, large-scale clinical trials to better define Vitamin D’s role in the prevention and management of Long COVID. Vitamin D represents a promising avenue for mitigating the long-term impacts of COVID-19. While current evidence is inconclusive, its safety, affordability, and potential efficacy warrant its consideration in global health strategies aimed at supporting recovery from this complex syndrome.
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A Paradigm Shift in Cystic Fibrosis: Insights into Molecular Diagnosis, Newborn Screening, and Nanotechnology-Based Drug Delivery for CF Treatment
Authors: Adithi Raghunath, Thejaswini Krishna, Parmar Keshri Nandan and Jayanthi SivaramanAvailable online: 29 May 2025More LessCystic fibrosis (CF) is a chronic and incurable disease that mainly damages the lungs and digestive system. Variations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene cause CF, a genetic disease that requires medical intervention due to multi-organ effects, particularly on the lungs. There are over six classes of variations observed in CF until now. The treatment and management of CF have greatly improved due to recent genetic advancements, especially the development of CFTR modulators such as Ivacaftor, Lumacaftor, and Tezacaftor, which may eventually lead to a cure for this incurable condition. Nevertheless, despite these developments, additional studies are still needed to elucidate the complex molecular pathways involved in CF and to develop more focused and efficient therapeutic approaches. In terms of CF clinical care and research, this study intends to offer a thorough examination of CFTR genetic polymorphisms with an emphasis on the variation of F508del and CFTR modulator drugs along with their clinical characteristics and the possible long-term effects of new findings and treatment choices. Moreover, the main benefits of treatment techniques like gene therapy, CRISPR-Cas9 systems, and nanotechnology-driven strategies have been discussed in the current study. Furthermore, as early diagnosis of CF provides the opportunity to prevent and control the complications of this disease, so a particular focus on the current newborn screening techniques has been covered as well. The present study's data have been meticulously chosen by an extensive review of the literature and it comprises an overview of findings from comprehensive investigations and peer-reviewed research publications about CF and associated therapies. The present study will assist in the continuous improvement of clinical practice and the creation of more potent treatment plans for CF patients.
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Navigating the Complexities of Human Metapneumovirus: Insights from Diagnosis to Therapeutic Innovations
Authors: Aman Kumar, Nayan Sood, Kaushal Aggarwal, Ritik Kumar Thakur, Preeti Patel and Balak Das KurmiAvailable online: 21 May 2025More LessHuman Metapneumovirus (hMPV) is an emerging respiratory pathogen responsible for respiratory infections worldwide. This perspective emphasizes the epidemiology, pathophysiology, virology, clinical features, diagnostics, and therapeutic strategies related to hMPV. It emphasizes current prevention and treatment approaches, underscoring the virus’s public health significance and advancements in research.
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Comparative Study between Once Daily LABA-LAMA (Indacaterol- glycopyrronium) vs. Twice Daily LABA-AMA (Formoterol- glycopyrronium) in Stable COPD Patients Group B
Authors: Neelam Verma and Avinash KumarAvailable online: 07 May 2025More LessBackgroundAn inflammatory lung condition that lasts a long time is called chronic obstructive pulmonary disease (COPD), it results from exposure to noxious substances, abnormalities in the bronchi, and obstruction of lung airflow owing to alveoli.
ObjectiveThis study compares the safety and efficacy of LABA-LAMA combination therapy administered at varied frequencies to individuals with stable chronic obstructive pulmonary disease. The purpose of the study is to ascertain which of the two combinations performs better when considering both subjective and objective criteria.
MethodsPatients with Group B Stable COPD in the outpatient department were assigned into two random groups of 50 and given a different medication combination. Those in Group 1 received a single daily dose of Indacaterol + Glycopyrrolate, while those in Group 2 received two daily doses of Formoterol + Glycopyrrolate. Every four weeks, patients were checked on individually. Spirometric data (FEV1 (% Pred), Trough FEV1 (L), FEV1/FVC), and symptoms (cough, shortness of breath, sputum production, sleep disturbance) were recorded for each patient.
ResultsAfter the therapy, both groups showed a decrease in symptomatic indicators. There was a notable improvement in trough FEV1 (L) and spirometric measurements. Moreover, no noticeable differences in subjective and objective criteria were observed between groups 1 and 2.
ConclusionThis study's conclusions are limited to patient populations with comparable features. To further elucidate the risk factors and potential genetic foundation of the disease conditions, more multi-centric studies including diverse ethnic groups must be conducted.
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Pulmonary Fibrosis: Causes, Development, Diagnosis, and Treatment with Emphasis on Murine and In vitro Models
Available online: 02 May 2025More LessExcessive extracellular matrix accumulation characterizes pulmonary fibrosis (PF), a degenerative disease of the interstitial lung that worsens with time and leads to respiratory failure. The current review emphasizes the complicated etiology of PF, which includes environmental exposures, genetic predispositions, and concomitant conditions such as autoimmune diseases, followed by its pathophysiology, diagnosis, and treatment strategies. Murine models have significantly improved our understanding of the pathogenesis of PF. For example, studies of bleomycin-induced lung fibrosis in mice have improved our understanding of the inflammation-fibrosis nexus and revealed new treatment targets. Genetic animal models that lack certain cytokines or signaling pathways (e.g., TGF-γ, IL-13) have helped clarify the role of these mediators in fibrosis formation. In vitro studies with fibroblasts and lung epithelial cells have supplemented these findings by allowing for the analysis of cellular responses to fibrogenic stimuli as well as medication screening. The primary methods for diagnosing PF include histopathological exams, imaging examinations, and pulmonary function testing. New non-invasive biomarkers have the potential to improve early monitoring and identification. Antifibrotic drugs, as well as lung transplantation in severe cases, are the only therapy options available at this time. To improve outcomes for patients with pulmonary fibrosis, this review highlights the need for novel therapies that target key pathophysiological processes and are supported by preclinical models.
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Clinical Profile and Predictors of Venous Thrombotic Events in Patients with Chronic Respiratory Diseases - An Observational Study
Available online: 30 April 2025More LessBackground and ObjectiveGrowing evidence suggests an increased risk of venous thromboembolism (VTE) in chronic respiratory disease (CRD) patients. Persistent lung inflammation, repeated hospitalization, and associated comorbidities render patients prone to VTE. Considering the limited data, we intended to determine the clinical profile and risk factors of VTE in CRD.
MethodsA retrospective case-control study was conducted at the Department of Pulmonary Medicine in a tertiary respiratory care center. The medical records of CRD patients from January 2020 to March 2023 were reviewed and data were collected. Confirmed cases with VTE (n = 50) using Doppler and computed tomography pulmonary angiogram (CTPA) and matched controls (n = 50) without VTE were included in the study. Clinical and radiological profiles of these patients, including age, sex, presence of comorbidities, duration of illness, severity of CRD, treatment details, chest radiograph, electrocardiogram, CBC, CRP, and D-dimer levels, were recorded. Predictors for VTE were assessed using univariate and multivariate analyses.
ResultsVTE was found more commonly in middle-aged patients and those with TOPD and COPD. Univariate analysis showed high pulse rate, low oxygen saturation (SpO2), higher diastolic blood pressure, higher mMRC grade of breathlessness, evidence of cor pulmonale on 2D echo, elevated WBC count, and CRP and D-dimer levels to be the predictors of VTE. In the multivariate analysis, low SpO2, higher mMRC grade of breathlessness, and elevated CRP and D-dimer levels were found to be independent predictors for VTE. We found 72% and 80% sensitivity and specificity for serum C-reactive protein at 58mg/dl and 84% and 100% sensitivity and specificity for D-dimer values at 560 ng/LFEU, respectively.
ConclusionVTE was found to be more common in tuberculosis-associated obstructive pulmonary disease (TOPD) than COPD at our centre. Low SpO2, greater severity of breathlessness, and elevated serum CRP and D-dimer levels were considered independent predictors of VTE in CRD. In CRD patients presenting with clinical worsening, evaluation for VTE in the presence of these risk factors can be useful in reducing morbidity and mortality.
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The Use of Portable Device for Measuring Nasal FeNO in Subjects with Allergic Rhinitis - A Single Center Study
Available online: 24 January 2025More LessObjectiveThis study aimed to demonstrate the accuracy of a portable device for measuring nasal and bronchial fractional exhaled nitric oxide (nFeNO and FeNO) as an alternative method to replace a high-cost multiple flow device in subjects with allergic rhinitis (AR).
MethodsIt was a descriptive and comparative study. The healthy subjects (control group), subjects with AR (AR group) and those with AR and asthma (AR-A group) were enrolled in this study. They underwent nasal and bronchial FeNO measurements by both fixed flow NObreath®connected to nasal mask (for nFeNO) and without mask (for FeNO) and multiple flows HypAir FeNO®.
ResultsThere were 153 subjects recruited during the study period, including 63 healthy subjects and 90 subjects with AR and AR-A. There were no statistically significant differences in anthropometric characteristics between study groups. The concentrations of nasal FeNO and bronchial FeNO measured by a portable device in subjects with AR were higher than in healthy subjects: 76.0 ± 50.7 ppb vs 36.0 ± 28.1 ppb (P < 0.01), and 32.3 ± 15.4 ppb vs 9.2 ± 5.6 ppb (P < 0.001). There was a weak correlation between nasal FeNO measured by portable devices and multiple flow devices.
ConclusionsThe portable device is useful in measuring nasal FeNO in subjects with AR. The advantages of a low-cost and accurate portable device may help it be used in primary care in the management of subjects with allergic rhinitis and asthma.
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Risk factors for Mortality in Patients with COVID-19 in Cuernavaca- Morelos
Available online: 22 January 2025More LessBackgroundThe world changed in December 2019 due to respiratory tract infection cases, initially of unknown etiology, later known as COVID-19.
ObjectiveThis study aimed to determine the factors and comorbidities associated with mortality from COVID-19 in Mexico.
MethodsIt was a cross-sectional and observational prospective study of patients treated at an IMSS (Mexican Institute of Social Security) Hospital in Morelos with a confirmed diagnosis of COVID-19. Logistic regression models and survival analyses were developed to identify factors associated with mortality risk.
Results3,965 patients were analyzed, with most deaths occurring in men. The mortality risks were higher in men who were older than 50 years. The most significant associations were: age older than 80 years (HR:3.17), endotracheal intubation (HR:1.54), dyspnea (HR: 13.55), and polypnea (HR:1.54).
ConclusionThe risk of death in this population was high, considering the absence of primary protective measures at the beginning of the pandemic and the lack of consistency in using personal protection elements.
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Exploring Pneumonia: Understanding its Epidemiology, Deciphering Pathogenic Complexities, and Developing Advanced Diagnostic and Therapeutic Approaches
Authors: Jaya Verma, Saurabh Shekhar, Monika, Mahima Chauhan, Bhavna Yadav, Sonali and Rahul Pratap SinghAvailable online: 20 January 2025More LessPneumonia, a widespread respiratory infection affecting the alveoli and lung parenchyma, continues to be a major global health concern, particularly in children. Despite advancements in vaccine development and anti-infective therapies, pneumonia is a leading cause of death, particularly among children and the elderly. It accounts for approximately 14% of all deaths in children under five years of age globally, with over 700,000 deaths occurring annually. In adults, especially those over 65 years of age, pneumonia significantly increases mortality, contributing to over 1 million deaths yearly worldwide. Community-acquired Pneumonia (CAP) is predominantly caused by Streptococcus pneumoniae, Mycoplasma pneumoniae, and Chlamydia pneumoniae. Streptococcus pneumoniae is the leading pathogen, particularly in infants, the elderly, and immunocompromised individuals, often resulting in severe clinical presentations. Mycoplasma pneumoniae causes milder, atypical pneumonia, commonly referred to as “walking pneumonia”, affecting young adults and adolescents. Chlamydia pneumoniae is also a significant cause of mild to moderate respiratory infections, particularly in school-aged children. The identification of these pathogens is critical for guiding empirical antimicrobial therapy, as the clinical severity and response to treatment vary with each microorganism. This review aimed to explore the intricacies of pneumonia pathogenesis and provide insights into the role of various microorganisms in its development. By emphasizing the importance of timely and appropriate antimicrobial therapy, the review further aims to underscore the need for rapid, accurate diagnostic tests capable of detecting pathogens and antibiotic resistance. Therefore, improving diagnostic capabilities and targeted treatments is essential for effective pneumonia management. The complexity of pneumonia pathogenesis and the variety of causative microorganisms require rapid, accurate diagnostic tests to guide appropriate therapy.
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Risk Factors Associated with Re-Hospitalization Duration in Post-COVID-19 Patients
Authors: Doan Le Minh Hanh and Nguyen Hoang Minh ThaoAvailable online: 08 January 2025More LessBackgroundAround 10-20% of hospitalized COVID-19 patients require readmission within 30-90 days, posing heightened risks of morbidity, mortality, and economic burden. Research on factors influencing post-COVID-19 readmission and hospital stay duration is limited.
ObjectiveThis study describes clinical characteristics and identifies risk factors for prolonged hospital stays in readmitted post-COVID-19 patients.
MethodsA cross-sectional study included 52 patients readmitted between January and June 2022.
ResultsPatients had a mean age of 63.5 years. Severe and critical COVID-19 histories were reported in 27% and 11.5% of cases, respectively. Common symptoms leading to readmission included dyspnea, cough, fever, and chest pain. Respiratory support was required for 67.3% of patients (SpO2 < 90%), with 38.5% needing mechanical ventilation. Elevated D-Dimer (2029.07 ± 406.61) and CRP (50.97 ± 8.95) levels were common, and lung consolidation was the predominant chest image finding. The median hospital stay was 24.5 days, with 71.2% of patients staying longer than 14 days. Upon discharge, 96.1% were stable; 1 patient died, and 1 was transferred. Longer hospital stays were positively correlated with severe COVID-19 history, mechanical ventilation, CRP, Urea, and lung consolidation, while Hb and LDH were negatively correlated. Severe COVID-19 and lung consolidation were independent risk factors for extended stays.
ConclusionReadmitted post-COVID-19 patients often experience respiratory complications requiring prolonged hospital stays. Key risk factors include a history of severe COVID-19 and lung consolidation at admission.
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Investigating Biomarkers and Molecular Mechanisms in COPD: Perspectives from In-vivo Models
Authors: Aarti Singh, Swamita Arora, Vivek Singh, Sanjar Alam, Wasim Akram, Anjali Dhillon, Shivendra Kumar, Arun Kumar and Sunam SahaAvailable online: 07 November 2024More LessPurposeThis review examines COPD pathogenesis, biomarkers, and treatment. COPD, a progressive respiratory illness that blocks airflow, causes high morbidity and death. The complicated pathophysiology of COPD involves genetic predisposition, environmental variables (particularly tobacco smoke), and inflammatory pathways. COPD diagnosis, prognosis, and monitoring depend on biomarkers in clinical and preclinical investigations. COPD care should include pharmaceutical and non-pharmacological therapies to improve symptoms, lung function, and outcomes.
Materials and MethodThis review examines COPD pathogenesis, cytokines, and risk factors. This review article discusses how immune system signalling molecules called cytokines contribute to COPD's persistent inflammation. Smoking and environmental contaminants are also examined as COPD risk factors. The analysis also covers biomarkers needed to diagnose and track the condition.
ResultsThe review paper on COPD highlights the critical role of cytokines in the disease's pathophysiology, emphasizing their contribution to chronic inflammation. Various cytokines, particularly interleukins, are implicated in driving the inflammatory processes within the airways and lungs, resulting in tissue damage and airflow limitation, which are hallmark features of COPD. The paper also identifies smoking and exposure to environmental pollutants as major risk factors for the development of COPD.
ConclusionThis review illuminates COPD's complex pathogenesis, highlighting cytokines' involvement in chronic inflammation. To create targeted therapeutics, cytokine-mediated pathways must be understood. The review emphasizes biomarkers' use in preclinical and clinical investigations to diagnose and monitor COPD and provide disease progression insights.
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Clinical Characteristics and Outcomes in Tracheobronchopathia Osteochondroplastica: A Scoping Review
Available online: 24 October 2024More LessBackground and ObjectiveTracheobronchopathia osteochondroplastica (TBOCP) is a rare, benign condition characterised by the presence of multiple bony and cartilaginous nodules in the tracheal and bronchial submucosa. Its etiology remains unknown, and clinical presentations and management vary.
MethodsWe conducted a scoping review to evaluate clinical and radiological characteristics, diagnostic investigations and prognostic outcomes of TBOCP in adults by exploring Pubmed and SCOPUS databases.
ResultsFrom the search results of 675 studies, 98 were included in this scoping review. TBOCP has a myriad of presenting symptoms and clinical severity but is notably an asthma mimic, displaying an obstructive pattern on spirometry. Bronchoscopic tools were the most common interventional diagnostic or management tool.
ConclusionWhile the etiology of TBOCP remains unknown, clinicians are alerted to its varied presentations and classical histopathological and gross morphological appearance.
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Asthma: An Overview of Pathophysiology, Molecular Mechanisms and Combination Therapy
Authors: S Sneha and Ekta SinghAvailable online: 15 October 2024More LessAsthma is a chronic inflammatory disorder of the respiratory airways that is characterized by narrowing of airways, wheezing, difficulty in respiration, shortness of breath, stiffness in the chest region, and sometimes cough. In some cases, mucus secretion is enhanced. Several factors precipitate asthma. These factors may contribute individually or collectively to the pathophysiology of asthma. The objective of this review is to compile a detailed description of pathways involved in asthma. This compilation helps provide a better understanding of the disease. The information provided in this review may be used for planning a personalized therapy. Besides pathways, this review includes the current therapy used for asthma management. New combinations of drugs targeting multiple pathways can be developed to better manage the disease.
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Approaches to Improve the Sleep Quality in Long Covid Patients: A Systematic Review
Authors: Soheila ShamsiKhani and Mahsa HosseiniAvailable online: 04 October 2024More LessBackgroundGiven the high prevalence of Long COVID, sleep problems have emerged as a significant issue for individuals after COVID-19 infection, potentially impacting their quality of life.
ObjectiveOur study aims to identify effective strategies for improving sleep quality and offers recommendations for future research.
MethodsThe present systematic review study investigated ways to improve sleep quality in Long COVID patients. The study was conducted according to the updated PRISMA guidelines. The risk of bias was assessed using ROB 2.0.
ResultsFinally, six articles were included in the present study to identify strategies for improving and enhancing sleep quality in Long COVID. The results of the present study indicate that various interventions have been carried out to improve sleep quality, including psychological, cognitive, and physical factors related to long-term COVID-19 conditions.
ConclusionBased on existing evidence, interventions such as mind meditation, yoga, and hyperbaric oxygen therapy have demonstrated efficacy in enhancing sleep quality among Long COVID patients.
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