Esta página se tradujo automáticamente y no se garantiza la precisión de la traducción. por favor refiérase a versión inglesa para un texto fuente.

Volumetric HRCT in Stable COPD Patients.

2 de septiembre de 2026 actualizado por: Mansoura University

The Role of Volumetric High-Resolution Computed Tomography (HRCT) of the Chest in the Assessment of Patients With Stable Chronic Obstructive Pulmonary Disease (COPD)

This study evaluates the role of volumetric high-resolution computed tomography (HRCT) of the chest in assessing patients with stable chronic obstructive pulmonary disease (COPD). COPD is a heterogeneous lung condition characterized by chronic pulmonary symptoms, structural airway/alveolar changes, and progressive airflow limitation. While spirometry provides a global assessment of lung function, it cannot localize or fully characterize specific structural abnormalities. Volumetric HRCT allows for detailed, quantitative imaging of lung parenchyma, emphysema extent, air trapping, and airway wall thickness. The primary objective of this cross-sectional observational study is to quantify emphysema, air trapping, and bronchial wall thickness in patients with stable COPD and to evaluate the relationship between these volumetric HRCT findings and clinical measures of disease severity. By identifying objective imaging parameters, this study aims to improve patient evaluation, disease staging, and clinical management.

Descripción general del estudio

Estado

Terminado

Condiciones

Intervención / Tratamiento

Descripción detallada

Background and Rationale:

Chronic Obstructive Pulmonary Disease (COPD) is characterized by persistent respiratory symptoms (such as dyspnea, cough, and sputum production) resulting from airway and/or alveolar abnormalities that cause progressive airflow obstruction. While irreversible airflow obstruction (post-bronchodilator FEV1/FVC < 0.70) measured by spirometry confirms the diagnosis, global spirometric tests lack the spatial resolution required to assess regional parenchymal destruction, emphysema distribution, or peripheral air trapping. Volumetric High-Resolution Computed Tomography (HRCT) enables detailed, three-dimensional quantitative assessment of lung parenchyma and structural alterations in COPD.

Study Objectives:

To quantify emphysema extent, air trapping, and airway wall thickness using volumetric HRCT.

To assess the relationship between quantitative volumetric HRCT findings and clinical measures of COPD severity.

Methods and Procedures:

This cross-sectional observational study is conducted at Mansoura University Hospital (smoking clinic and chest disease general clinic) under ethics approval code MS.25.02.3101. Enrolled participants include patients with stable COPD diagnosed according to GOLD guidelines.

All participants undergo the following assessments:

Clinical Evaluation: Comprehensive history taking (symptoms, smoking status), physical examination, and mMRC Dyspnea Scale grading.

Pulmonary Function Testing & Lung Volumes: Spirometry (FEV1, FVC, FEV1/FVC, MMEF), 6-Minute Walk Test (6MWT), and lung volume measurements (RV, TLC, RV/TLC%).

Laboratory Tests: Complete Blood Count (CBC) with calculation of Neutrophil-to-Lymphocyte Ratio (NLR) and Platelet-to-Lymphocyte Ratio (PLR), and Arterial Blood Gas (ABG) analysis.

HRCT Imaging Protocol: Multidetector HRCT (minimum 64-slice, ≤1,5 mm slice thickness, 512x512 matrix) performed during full inspiratory breath-hold (with optional expiratory scanning for air trapping evaluation). Dedicated high-resolution algorithms and window settings are applied to quantify parenchymal and bronchial changes.

nd bronchial changes.

Tipo de estudio

De observación

Inscripción (Actual)

75

Contactos y Ubicaciones

Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.

Ubicaciones de estudio

  • Egipto
    • Dakahlia Governorate
      • Al Mansurah, Dakahlia Governorate, Egipto, 35516
        • Mansoura University Hospital (Chest Disease Department)

Criterios de participación

Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.

Criterio de elegibilidad

Edades elegibles para estudiar

  • Adulto
  • Adulto Mayor

Acepta Voluntarios Saludables

N/A

Método de muestreo

Muestra no probabilística

Población de estudio

Patients attending the smoking clinic and chest disease general clinic at Mansoura University Hospital who have stable COPD confirmed by pulmonary function testing.

Descripción

Inclusion Criteria:Patients with stable chronic obstructive pulmonary disease (COPD)

Diagnosed according to GOLD criteria (post-bronchodilator FEV1/FVC < 0.70)

-

Exclusion Criteria:

  1. Patient in exacerbation defined as change in the patient's baseline dyspnea, cough, and/or sputum beyond normal day-to-day variations within 14 days . (Ko, Fanny W., et al 2016)
  2. Connective tissue disease .
  3. Previously diagnosed Interstitial lung disease

  4. Contraindication to PFT According to ATS (Stanojevic S., et al 2021)

    • Recent Myocardial Infarction Within 1 week
    • Blood Pressure Instability Severe hypertension or systemic hypotension
    • Arrhythmias Significant, uncontrolled atrial or ventricular arrhythmias
    • Decompensated heart failure
    • Pulmonary Circulation Issues: Uncontrolled pulmonary hypertension, acute cor pulmonale, or clinically unstable pulmonary embolism
    • History of Syncope Loss of consciousness related to coughing or forced expiration
    • Cerebral Aneurysm
    • Recent Brain Surgery: Within 4 weeks
    • Concussion: Recent concussion with prolonged symptoms
    • Eye Surgery: Recent eye surgery within 1 week
    • Pneumothorax: Active or untreated pneumothorax Recent Thoracic Surgery: Within 4 weeks Recent Abdominal Surgery: Within 4 weeks Late-Term Pregnancy
  5. Contraindicatins of 6MWT according to ATS :

Absolute contraindications

  • Unstable Angina Experienced during the previous 1 month.
  • Recent Myocardial Infarction : Within the previous 1 month. Relative contraindications
  • Resting Tachycardia: Resting heart rate > 120{ bpm}.

  • Severe Uncontrolled Hypertension:

    • Systolic Blood Pressure > 180{ mmHg}
    • Diastolic Blood Pressure > 100{ mmHg}
  • Symptomatic/Severe Cardiac Conditions: High-degree atrioventricular (AV) block, hypertrophic cardiomyopathy, or symptomatic severe aortic stenosis.

Plan de estudios

Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.

¿Cómo está diseñado el estudio?

Detalles de diseño

Cohortes e Intervenciones

Grupo / Cohorte
Intervención / Tratamiento
Stable COPD Patients
Stable Chronic Obstructive Pulmonary Disease (COPD) patients undergoing quantitative volumetric High-Resolution Computed Tomography (HRCT) of the chest to evaluate parameters such as air trapping and lung volumes, combined with clinical assessment including mMRC dyspnea scale scoring and laboratory assessment including Cbc abg
Prueba de diagnóstico: Volumetric HRCT chest
Multidetector volumetric high-resolution computed tomography (≥64 slices, ≤1.0 mm slice thickness) performed during full inspiratory breath-hold and full expiratory breath-hold to quantitatively measure emphysema percentage (EM%), air trapping percentage (AT%), wall thickness (WT), wall area (WA) ,WA% and WT%
Prueba de diagnóstico: Spirometry and Body Plethysmography
Standardized pulmonary function testing performed according to ATS/ERS standards to measure post-bronchodilator forced expiratory volumes (FEV1, FVC) and static lung volumes (RV/TLC ratio).

¿Qué mide el estudio?

Medidas de resultado primarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Emphysema Percentage (EM%) Across GOLD Stages
Periodo de tiempo: Baseline
Volumetric CT assessment quantifying the percentage of low-attenuation lung areas below -950 Hounsfield Units (%LAA-950) across post-bronchodilator GOLD grades (GOLD 1 to 4). Unit of Measure: Percentage (%)
Baseline
Bronchial Wall Thickness (WT) Across GOLD Stages
Periodo de tiempo: Baseline
Volumetric CT quantitative measurement of airway wall thickness evaluated in segmental and subsegmental bronchi across post-bronchodilator GOLD grades (GOLD 1 to 4).Unit of measurements millimeter (mm).
Baseline
Percentage Wall Area (WA%) Across GOLD Stages
Periodo de tiempo: Baseline
Volumetric CT quantitative measurement of bronchial wall area expressed as a percentage of total bronchial cross-sectional area across post-bronchodilator GOLD grades (GOLD 1 to 4). Unit of Measure: Percentage (%)
Baseline
Air Trapping Percentage (AT%) Across GOLD Stages
Periodo de tiempo: Baseline
Volumetric CT assessment evaluating the percentage of low-attenuation lung areas on paired expiratory CT scans (%LAA-856 or expiratory/inspiratory ratio) across post-bronchodilator GOLD grades (GOLD 1 to 4). Unit of Measure: Percentage (%)
Baseline
Percentage Wall Thickness (WT%) Across GOLD Stages
Periodo de tiempo: Baseline
Volumetric CT quantitative measurement of bronchial wall thickness expressed as a percentage of total bronchial outer diameter evaluated in segmental and subsegmental bronchi across post-bronchodilator GOLD grades (GOLD 1 to 4). Unit of Measure: Percentage (%)
Baseline
Absolute Wall Area (WA) Across GOLD Stages
Periodo de tiempo: Baseline
Volumetric CT quantitative measurement of absolute bronchial wall cross-sectional area evaluated in segmental and subsegmental bronchi across post-bronchodilator GOLD grades (GOLD 1 to 4). Unit of Measure: Millimeter (mm)
Baseline

Medidas de resultado secundarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Correlation Coefficient Between CT Emphysema Percentage (EM%) and Spirometric FEV1/FVC Ratio
Periodo de tiempo: Baseline (same day or within 1 week of HRCT scan)

Pearson's or Spearman's correlation coefficient evaluating the relationship between quantitative CT-derived emphysema percentage (%LAA-950) and post-bronchodilator FEV1/FVC ratio measured by spirometry.

Unit of Measure: Correlation coefficient (r)
Baseline (same day or within 1 week of HRCT scan)
Correlation Coefficient Between CT Air Trapping Percentage (AT%) and Plethysmographic RV/TLC Ratio
Periodo de tiempo: Baseline (same day or within 1 week of HRCT scan)

Pearson's or Spearman's correlation coefficient evaluating the relationship between quantitative expiratory CT air trapping percentage (%LAA-856) and plethysmographic Residual Volume to Total Lung Capacity ratio (RV/TLC expressed as % predicted).

Unit of Measure: Correlation coefficient (r)
Baseline (same day or within 1 week of HRCT scan)

Otras medidas de resultado

Medida de resultado
Medida Descripción
Periodo de tiempo
Correlation Coefficient Between CT Emphysema Percentage (EM%) and Arterial Oxygen Tension (pO2)
Periodo de tiempo: Baseline

Pearson's or Spearman's correlation coefficient evaluating the relationship between quantitative CT-derived emphysema percentage (%LAA-950) and arterial blood gas oxygen tension (pO2 measured in mmHg).

Unit of Measure: Correlation coefficient (r)
Baseline

Colaboradores e Investigadores

Aquí es donde encontrará personas y organizaciones involucradas en este estudio.

Patrocinador

Mansoura University

Investigadores

  • Investigador principal: Nesreen Shalabi, Professor of Chest Diseases

Fechas de registro del estudio

Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados ​​por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.

Fechas importantes del estudio

Inicio del estudio (Actual)

20 de abril de 2025

Finalización primaria (Actual)

20 de mayo de 2026

Finalización del estudio (Actual)

20 de agosto de 2026

Fechas de registro del estudio

Enviado por primera vez

29 de agosto de 2026

Primero enviado que cumplió con los criterios de control de calidad

2 de septiembre de 2026

Publicado por primera vez (Actual)

9 de septiembre de 2026

Actualizaciones de registros de estudio

Última actualización publicada (Actual)

9 de septiembre de 2026

Última actualización enviada que cumplió con los criterios de control de calidad

2 de septiembre de 2026

Última verificación

1 de agosto de 2026

Más información

Términos relacionados con este estudio

Palabras clave

Términos MeSH relevantes adicionales

Otros números de identificación del estudio

  • MS.25.02.3101

Información sobre medicamentos y dispositivos, documentos del estudio

Estudia un producto farmacéutico regulado por la FDA de EE. UU.

No

Estudia un producto de dispositivo regulado por la FDA de EE. UU.

No

Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .

Suscribir