Evaluation of Agreement on Presence and Severity of Tracheobronchomalacia by Dynamic Flexible Bronchoscopy

[Specialist Guidelines of The German Respiratory Society for Diagnosis and Treatment of adult Patients Suffering from Cough]

This is the 4th edition of the Cough Guidelines of the German Respiratory Society written by respiratory, gastroenterology, ear-nose-throat specialists, including respiratory physiotherapists and speech pathology specialists; importantly, a patient representative was also involved.Compared with earlier versions we used a new methodology: after discussion in the guidelines group, we asked and answered the 12 most important and most frequent "key" questions regarding the clinical practice. The extent of the guideline could thus be significantly reduced.We added a short scientific background to each of the answers including the most recent references. The recommendations and statements were created in consensus and graded as strong, or weak. If sufficient literature was not available, we suggested discussing joint decisions with the patient.The 12 key questions are as follows:- Key question 1: The classification of cough (acute, i. e. up to three weeks duration; chronic, i. e. after 8 weeks duration and subacute in between) did not change, but we added "cough with or without expectoration as an additional classification aspect with therapeutic consequences.- Key question 2: Acute and subacute cough are mostly (but not exclusively) due to the common cold. They are the first or second most frequent symptom prompting patients to seek medical (or pharmacist's) care. Antibiotic therapy is strongly discouraged for common cold- Key question 3: We defined "Red flags" for mandatory immediate diagnostic for acute cough, which usually does not require such diagnostic procedures- Key question 4: Chronic cough overview of the most common causes for- Key question 5: Cough in acute SARS-CoV-2 infection and in long COVID - Key question 6: Refractory chronic cough and idiopathic chronic cough, two recently established entities were explained more in detail- Key question 7: To upper airway cough syndrome - Key question 8: Gastro-oesophageal-reflux-related cough - Key question 9: Cough-variant asthma and non-asthmatic eosinophilic bronchitis - Key question 10: Overview of drugs causing cough - Key question 11: Basic and personalized (due to the individual history) diagnostic procedures for patients with cough- Key question 12: Physiotherapy, speech therapy and pharmacotherapy for cough.

Intra-Observer and Interobserver Consistency in the Diagnosis of Lower Airway Malacia Using Dynamic Flexible Bronchoscopy in Pediatric Patients

BACKGROUND

Lower airway malacia (LAM) is characterized by excessive collapsibility of the airway during expiration. Although flexible bronchoscopy is widely employed for diagnosis, it is prone to Interobserver variability and technical limitations. This study aims to evaluate intra- and Interobserver consistency in diagnosing LAM in pediatric patients using dynamic flexible bronchoscopy and to assess the impact of bronchoscope size and observer training on diagnostic agreement.

METHODS

Pediatric patients who underwent fiberoptic flexible bronchoscopy for dynamic evaluation of LAM were included in this study. A total of 100 anonymized video recordings (50 with diagnosed with LAM and 50 classified as normal) were randomly selected for review. Six pediatric pulmonology specialists independently evaluated these recordings for the presence of LAM, including tracheomalacia (TM) and bronchomalacia (BM), using standardized diagnostic criteria. Interobserver and intra-observer consistency were assessed through statistical analysis with Cohen's Kappa coefficient.

RESULTS

Intraobserver consistency for diagnosing LAM ranged from substantial to almost perfect (0.675 to 0.857). Interobserver consistency was moderate to substantial (0.583 to 0.689), showing the highest agreement for TM when using the 2.8 mm bronchoscope. Center 1, where evaluations were conducted by a single trainer, demonstrated higher Interobserver consistency (0.606 to 0.689) than Center 2, which involved multiple trainers (0.502 to 0.562). The agreement was notably lower for BM, especially within the intermediate bronchi.

CONCLUSION

The observed variability in diagnostic consistency highlights the critical need for standardized diagnostic guidelines, which could improve treatment outcomes for pediatric patients with LAM.

Assessment of breathlessness: a pulmonologist's perspective - short of breath, but not short of answers

Breathlessness, or dyspnoea, is a complex symptom influenced by respiratory, cardiovascular and neural mechanisms, necessitating a systematic and tiered approach for accurate diagnosis and effective management. This review presents a structured, three-tier diagnostic framework, comprising history-taking, static testing (such as pulmonary function tests and thoracic imaging), and dynamic testing (e.g., 6-minute walk test and cardiopulmonary exercise testing) for comprehensive assessment. Each tier is designed to progressively investigate and characterise underlying conditions. This framework is specifically tailored for use in an outpatient general respiratory clinic setting, where clinicians evaluate chronic or unexplained dyspnoea in non-acute patients. Literature and guidelines support this approach, highlighting the importance of combining clinical examination, imaging, laboratory testing and dynamic assessments to capture both static and exertional components of dyspnoea. Emphasising a patient-centred approach, this framework aims to improve diagnostic accuracy and guide targeted therapeutic interventions.

Trakeobronkomalasi hos barn

This clinical review article aims to describe symptoms and findings in cases of paediatric tracheobronchomalacia to help achieve the correct diagnosis and treatment. Symptoms and signs vary from reduced physical stamina, barking cough, productive cough and gurgling to obstructive episodes or episodes with stridor, which in some cases can be life-threatening. The range of symptoms overlaps with other pulmonary diseases, such as asthma, which increases the risk of misdiagnosis and treatment error. Bronchoscopy is the main diagnostic tool but is resource intensive.

Enhancing Robustness of Adhesive Hydrogels through PEG-NHS Incorporation

Tissue wounds are a significant challenge for the healthcare system, affecting millions globally. Current methods like suturing and stapling have limitations as they inadequately cover the wound, fail to prevent fluid leakage, and increase the risk of infection. Effective solutions for diverse wound conditions are still lacking. Adhesive hydrogels, on the other hand, can be a potential alternative for wound care. They offer benefits such as firm sealing without leakage, easy and rapid application, and the provision of mechanical support and flexibility. However, the in vivo durability of hydrogels is often compromised by excessive swelling and unforeseen degradation, which limits their widespread use. In this study, we addressed the durability issues of the adhesive hydrogels by incorporating acrylamide polyethylene glycol N-hydroxysuccinimide (PEG-NHS) moieties (max. 2 wt %) into hydrogels based on hydroxy ethyl acrylamide (HEAam). The results showed that the addition of PEG-NHS significantly enhanced the adhesion performance, achieving up to 2-fold improvement on various soft tissues including skin, trachea, heart, lung, liver, and kidney. We further observed that the addition of PEG-NHS into the adhesive hydrogel network improved their intrinsic mechanical properties. The tensile modulus of these hydrogels increased up to 5-fold, while the swelling ratio decreased up to 2-fold in various media. These hydrogels also exhibited improved durability under the enzymatic and oxidative biodegradation induced conditions without causing any toxicity to the cells. To evaluate its potential for clinical applications, we used PEG-NHS based hydrogels to address tracheomalacia, a condition characterized by inadequate mechanical support of the airway due to weak/malacic cartilage rings. Ex vivo study confirmed that the addition of PEG-NHS to the hydrogel network prevented approximately 90% of airway collapse compared to the case without PEG-NHS. Overall, this study offers a promising approach to enhance the durability of adhesive hydrogels by the addition of PEG-NHS, thereby improving their overall performances for various biomedical applications.

Dynamic computed tomography for evaluation of tracheobronchomalacia in premature infants with bronchopulmonary dysplasia

INTRODUCTION

Dynamic computed tomography (dCT) gives real-time physiological information and objective descriptions of airway narrowing in tracheobronchomalacia (TBM). There is a paucity of literature in the evaluation of TBM by dCT in premature infants with bronchopulmonary dysplasia (BPD). The aim of this study is to describe the findings of dCT and resultant changes in management in premature infants with TBM.

METHODS

A retrospective study of 70 infants was performed. Infants included were <32 weeks gestation without major anomalies. TBM was defined as ≥50% expiratory reduction in cross-sectional area with severity defined as mild (50%-75%), moderate (≥75%-90%), or severe (≥90%).

RESULTS

Dynamic CT diagnosed malacia in 53% of infants. Tracheomalacia was identified in 49% of infants with severity as 76% mild, 18% moderate, and 6% severe. Bronchomalacia was identified in 43% of infants with varying severity (53% mild, 40% moderate, 7% severe). Resultant management changes included PEEP titration (44%), initiation of bethanechol (23%), planned tracheostomy (20%), extubation trial (13%), and inhaled ipratropium bromide (7%).

CONCLUSION

Dynamic CT is a useful noninvasive diagnostic tool for airway evaluation of premature infants. Presence and severity of TBM can provide actionable information to guide more precise clinical decision making.

Prevalence of tracheobronchomalacia is higher than previously reported in children with cystic fibrosis

BACKGROUND

Tracheobronchomalacia (TBM) is estimated to be present in 1 in 2100 children. Previous reports suggest the prevalence is higher in children with cystic fibrosis (CF). This has clinical implications with potential to influence airway clearance and lung health.

AIM

To determine the prevalence and clinical associations of TBM in Western Australian children with CF.

METHODS

Children with CF born between 2001 and 2016 were included. Operation reports from bronchoscopies performed until the age of 4 were retrospectively reviewed. Data were collected on the presence, persistence defined as a repeat diagnosis, and severity of TBM. Data on genotype, pancreatic status, and symptoms at CF diagnosis were extracted from the medical record. Associations between categorical variables were compared using χ2 and Fisher's exact test.

RESULTS

Of 167 children (79 male), 68 (41%) were diagnosed with TBM at least once, with TBM persistent in 37 (22%) and severe in 31 (19%). TBM was significantly associated with pancreatic insufficiency (χ2  = 7.874, p < 0.05, odds ratio [OR] 3.4), delta F508 gene mutation (χ2  = 6.489, p < 0.05, OR 2.3), and a presentation of meconium ileus (χ2  = 8.615, p < 0.05, OR 5.0). Severe malacia was less likley in females (χ2 = 4.523, p < 0.05, OR 0.42) . No significant relationship was found with respiratory symptoms at the time of CF diagnosis (χ2  = 0.742, p = 0.39).

CONCLUSIONS

TBM was common in this group of children under the age of 4 with CF. A high index of suspicion for airway malacia should be considered in children with CF, particularly those who present with meconium ileus and have gastrointestinal symptoms at diagnosis.

Wet adhesive hydrogels to correct malacic trachea (tracheomalacia) A proof of concept

Tracheomalacia (TM) is a condition characterized by a weak tracheal cartilage and/or muscle, resulting in excessive collapse of the airway in the newborns. Current treatments including tracheal reconstruction, tracheoplasty, endo- and extra-luminal stents have limitations. To address these limitations, this work proposes a new strategy by wrapping an adhesive hydrogel patch around a malacic trachea. Through a numerical model, first it was demonstrated that a hydrogel patch with sufficient mechanical and adhesion strength can preserve the trachea's physiological shape. Accordingly, a new hydrogel providing robust adhesion on wet tracheal surfaces was synthesized employing the hydroxyethyl acrylamide (HEAam) and polyethylene glycol methacrylate (PEGDMA) as main polymer network and crosslinker, respectively. Ex vivo experiments revealed that the adhesive hydrogel patches can restrain the collapsing of malacic trachea under negative pressure. This study may open the possibility of using an adhesive hydrogel as a new approach in the difficult clinical situation of tracheomalacia.

Pulmonary function of children with tracheomalacia and associated clinical factors

OBJECTIVES

Spirometry is easily accessible yet there is limited data in children with tracheomalacia. Availability of such data may inform clinical practice. We aimed to describe spirometry indices of children with tracheomalacia, including Empey index and flow-volume curve pattern, and determine whether these indices relate with bronchoscopic features.

METHODS

From the database of children with tracheomalacia diagnosed during 2016-2019, we reviewed their flexible bronchoscopy and spirometry data in a blinded manner. We specially evaluated several spirometry indices and tracheomalacia features (cross-sectional lumen reduction, malacic length, and presence of bronchomalacia) and determined their association using multivariable regression.

RESULTS

Of 53 children with tracheomalacia, the mean (SD) peak expiratory flow (PEF) was below the normal range [68.9 percent of predicted value (23.08)]. However, all other spirometry parameters were within normal range [Z-score forced expired volume in 1 s (FEV₁ ) = -1.18 (1.39), forced vital capacity (FVC) = -0.61 (1.46), forced expiratory flow between 25% and 75% of vital capacity​​​​​​ (FEF_25%-75% ) = -1.43 (1.10), FEV₁ /FVC = -1.04 (1.08)], Empey Index = 8.21 (1.59). The most common flow-volume curve pattern was the "knee" pattern (n = 39, 73.6%). Multivariable linear regression identified the presence of bronchomalacia was significantly associated with lower flows: FEV₁ [coefficient (95% CI) -0.78 (-1.54, -0.02)], FEF_25%-75% [-0.61 (-1.22, 0)], and PEF [-12.69 (-21.13, -4.25)], all p ≤ 0.05. Other bronchoscopic-defined tracheomalacia features examined (cross-sectional lumen reduction, malacic length) were not significantly associated with spirometry indices.

CONCLUSION

The "knee" pattern in spirometry flow-volume curve is common in children with tracheomalacia but other indices, including Empey index, cannot be used to characterize tracheomalacia. Spirometry indices were not significantly associated with bronchoscopic tracheomalacia features but children with tracheobronchomalacia have significantly lower flow than those with tracheomalacia alone.

Imaging in neonatal respiratory disease

The purpose of this review is to describe the current state of the art in clinical imaging for NICU patients, divided into major areas that correspond to likely phenotypes of neonatal respiratory disease: airway abnormalities, parenchymal disease, and pulmonary vascular disease. All common imaging modalities (ultrasound, X-ray, CT, and MRI) are discussed, with an emphasis on modalities that are most relevant to the individual underlying aspects of disease. Some promising aspects of dynamic and functional imaging are included, where there may be future clinical applicability.