Learning curves and association of pathologist's performance with the diagnostic accuracy of linear endobronchial ultrasound transbronchial needle aspiration (EBUS-TBNA): a cohort study in a tertiary care reference centre.

OBJECTIVES: We aimed to assess the learning curves and the influence of the pathologist's performance on the endobronchial ultrasound transbronchial needle aspiration's (EBUS-TBNA's) diagnostic accuracy in a real-world study. DESIGN/SETTING: Cohort study conducted in a tertiary care university hospital (single centre) with patients referred for EBUS-TBNA. PARTICIPANTS/INTERVENTION: We initially evaluated 376 patients (673 lymph nodes), 368 (660 lymph nodes) of whom were recruited. The inclusion criterion was EBUS-TBNA indicated for the study of mediastinal or hilar lesions. The exclusion criteria were the absence of mediastinal and hilar lesions during EBUS confirmed by a normal mediastinum and hilum on chest CT (except in cases of mediastinal staging of cancer) and lost to follow-up. PRIMARY AND SECONDARY OUTCOME MEASURES: Diagnostic accuracy and related outcomes. METHODS: We included patients from a prospectively constructed database. We performed a logistic regression multivariate analysis to adjust for potential confounders of the association between pathologist performance and EBUS-TBNA accuracy. The Cumulative Summation (CUSUM) analysis was used to assess pathologists' performance and learning curves. RESULTS: Most indications for EBUS were suspicion of malignancy, including intrathoracic tumours (68.3%), extrathoracic tumours (9.8%) and cancer staging (7.0%). The patients' mean age was 63.7 years, and 71.5% were male. Overall EBUS-TBNA accuracy was 80.8%. In the multivariate logistic regression model, the factors independently associated with EBUS-TBNA accuracy included certain pathologists (ORs ranging from 0.16 to 0.41; p<0.017), a lymph node short-axis diameter <1 cm (OR: 0.36; 95% CI 0.21 to 0.62; p<0.001), and the aetiology of lymph node enlargement (ORs ranging from 7 to 37; p<0.001). CUSUM analysis revealed four different learning curve patterns, ranging from almost immediate learning to a prolonged learning phase, as well as a pattern consistent with performance attrition. CONCLUSIONS: Pathologists' proficiency conditioned EBUS-TBNA accuracy. This human factor is a potential source of error independent of factors conditioning tissue sample adequacy.

A propósito de complicaciones infrecuentes de enfermedades comunes. Síndrome de Ekiri / About Infrequent complications of common diseases: Ekiri Syndrome

Resumen La infección por enterobacterias desencadena usualmente síntomas gastrointestinales caracterizados por vómito, diarrea y dolor abdominal, de severidad y curso variable. El compromiso extraintestinal esta descrito, inclusive sin las manifestaciones gastrointestinales clásicas lo que favorece diagnósticos y tratamientos tardíos pudiendo llegar a ser incapacitantes y letales. El síndrome de Ekiri, también denominado síndrome de encefalopatía letal tóxico, se caracteriza por una disfunción aguda del sistema nervioso central secundaria a infección por enterobacterias las cuales favorecen el desarrollo de microtrombos a nivel cerebral con inflamación mediada por el factor de necrosis tumoral α e IL- 1β y disfunción de la barrera hematoencefálica con una alta tasa de mortalidad. Dentro de nuestro conocimiento, presentamos el primer caso reportado en Colombia sobre el síndrome de Ekiri.

Abstract Gastrointestinal infection usually manifests with nausea, vomit and abdominal pain, all of them wit course and variable severity. Extrainstestinal compromise is described, even without gastrointestinal symptoms, what causes a delay on diagnosis and treatment, worsening the prognosis. Ekiri syndrome, also known as lethal toxic encephalopathy is characterized by an acute neurological dysfunction secondary to enterobacterial infection which favor thrombi development and local inflammation mediated by tumor necrosis factor alpha and IL-1β with blood brain barrier dysfunction and high mortality. As we know, we present the first Ekiri syndrome case reported in Colombia.

Bronchoscopist's perception of the quality of the single-use bronchoscope (Ambu aScope4™) in selected bronchoscopies: a multicenter study in 21 Spanish pulmonology services.

BACKGROUND: The disposable bronchoscope is an excellent alternative to face the problem of SARS-CoV-2 and other cross infections, but the bronchoscopist's perception of its quality has not been evaluated. METHODS: To evaluate the quality of the Ambu-aScope4 disposable bronchoscope, we carried out a cross-sectional study in 21 Spanish pulmonology services. We use a standardized questionnaire completed by the bronchoscopists at the end of each bronchoscopy. The variables were described with absolute and relative frequencies, measures of central tendency and dispersion depending on their nature. The existence of learning curves was evaluated by CUSUM analysis. RESULTS: The most frequent indications in 300 included bronchoscopies was bronchial aspiration in 69.3% and the median duration of these was 9.1 min. The route of entry was nasal in 47.2% and oral in 34.1%. The average score for ease of use, image, and aspiration quality was 80/100. All the planned techniques were performed in 94.9% and the bronchoscopist was satisfied in 96.6% of the bronchoscopies. They highlighted the portability and immediacy of the aScope4TM to start the procedure in 99.3%, the possibility of taking and storing images in 99.3%. The CUSUM analysis showed average scores > 70/100 from the first procedure and from the 9th procedure more than 80% of the scores exceeded the 80/100 score. CONCLUSIONS: The aScope4™ scored well for ease of use, imaging, and aspiration. We found a learning curve with excellent scores from the 9th procedure. Bronchoscopists highlighted its portability, immediacy of use and the possibility of taking and storing images.

Microbiological characterization of severe exacerbations in Chronic Obstructive Pulmonary Disease (COPD) in patients admitted to the ICU with or without associated pneumonia: A retrospective cross-sectional study / Caracterización microbiológica de pacientes con enfermedad pulmonar obstructiva crónica (EPOC) ingresados a UCI con exacerbación grave o neumonía: un estudio transversal retrospective

Objective: The goal of this study was to compare the microbiology of severe exacerbations of chronic obstructive pulmonary disease (COPD) requiring admission to the intensive care unit (ICU), in patients with pneumonia compared to those that did not have. Methods: We conducted a retrospective cross-sectional study that included patients with severe COPD exacerbation. We took microbiologic and serologic samples to study the etiology of the exacerbation and chest X-ray to see whether or not it had associated pneumonia. Results: Ninety-one patients were included in the study. 53/91 (58%) had pneumonia. The most prevalent bacteria isolated were H. influenzae (25.3%), Moraxella spp (22%), H. parainfluenza (14.3%), Serratia marcescens (13.2%), mixed flora (9.9%) and methicillin-susceptible Staphylococcus aureus (9.9%). A statistically significant difference could not be demonstrated between the two groups. We detected 24.2% of bacterial resistance in both groups, the most frequent being AMPc (13 cases). Discussion: Bacterial pneumonia in COPD patients is higher in comparison with patients with acute exacerbation. Even though we did not find a significant difference in the microbiology of the groups with or without pneumonia, there are variables such as past smoking related to having pneumonia. Patients with pneumonia also had higher severity scores.

Objetivo: Comparar la microbiología de las exacerbaciones graves de EPOC (Enfermedad Pulmonar Obstructiva Crónica) que requieren ingreso a la unidad de cuidados intensivos, con y sin neumonía Métodos: se realizó un estudio transversal retrospectivo que incluyó pacientes con exacerbación grave de EPOC que requieren ingreso a la Unidad de Cuidados Intensivos (UCI). Tomamos muestras microbiológicas y serológicas para estudiar la etiología de la exacerbación y radiografía de tórax para ver si tenía o no una neumonía asociada. Seguimos a los pacientes durante su ingreso en la UCI y evaluamos el resultado de la hospitalización. Resultados: se incluyeron 91 pacientes en el estudio. 53/91 ( 58%) tuvieron confirmación de neumonía. Las bacterias más prevalentes aisladas fueron H. influenzae (25.3%), Moraxella spp (22%), H. parainfluenza (14.3%), Serratia marcescens (13.2%), flora mixta (9.9%) y S. aureus meticilino sensible. (9.9% ). No se pudo demostrar una diferencia estadísticamente significativa entre los dos grupos. Detectamos una resistencia bacteriana del 24,2% en ambos grupos, siendo la más frecuente AMPc (13 casos). Discusión: la neumonía bacteriana en pacientes con EPOC es más alta cuando se compara con pacientes con exacerbación aguda. Aunque no encontramos una diferencia significativa en la microbiología de los grupos con o sin neumonía, existen variables como antecedente de cigarrillo asociadas a tener neumonía. Los pacientes con neumonía así mismo tuvieron mayores índices de severidad.