Electrical Impedance Tomography of Lung in Child and Young Age

Study Overview
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Brief Summary
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The investigator will determine a compliance of two diagnostic techniques (EIT and Body plethysmography) in collective of children and teenagers with obstructive lung disease and a matched control group.

Detailed Description
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The aim of the present study is verification of the correlation between EIT-derived data and following extracted parameters of the pulmonary function: forced expiratory volume in 1 second (FEV 1) forced vital capacity (FVC) relative forced expiratory volume in 1 second (FEV1/FVC) maximal expiratory flow (MEF 25) total lung capacity (TLC) resistance (Raw). These findings could bring out new prospective opportunity for pulmonary function tests without cooperation. Furthermore, the study aims to clarify whether EIT technique can be used for regional pulmonary function testing. In addition, dynamic lung function parameter and static radiological techniques will be correlated with EIT.

Official Title
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Electrical Impedance Tomography of Lung in Child and Young Age

Conditions
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Obstructive Lung Diseases

Intervention / Treatment
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* Procedure: patients
* Procedure: probands


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients: children and teenagers with obstructive pulmonary disease (asthma, cystic fibrosis, immotile-cilia-syndrome, obstructive brochitis, obstructive pneumonia). Probands: Children and Teenager of 5-18 years without known obstructive pulmonary diseases Exclusion Criteria: active implants (ICD, CRT) metal in chest artificial heart valve children < 5 years pregnant and lactating females Persons, who are in relationship of dependence to the investigator / sponsor Persons, who are not able to understand and follow the instructions of the study personnel. Lack of signed informed consent (by legal guardian /proband)

Ages Eligible for Study
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Minimum Age: 5 Years
Maximum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Patients<br>Children and Teenager of 5-18 years with obstructive pulmonary disease (asthma, cystic fibrosis, immotile-cilia-syndrome, obstructive bronchitis, obstructive pneumonia). | Procedure: patients<br>* The 16-electrode belt will be applied to patient's chest. Following vital signs will be recorded: respiratory rate at rest breathing, heart rate, transcutaneous oxygen saturation. Then impulse oscillometry (IOS) will be performed in a sitting position. After that, subjects with cooperation willingness will get a body plethysmography. A spirometry / forced breathing maneuvers will be performed. All patients will receive 2 strokes salbutamol inhaler for bronchospasmolysis. Please note that inhalation of salbutamol is not study related. It is used in the clinical routine to examine the reversibility of the bronchial obstruction in patients with obstructive lung disease in course of the lung function test. Ten minutes later measurements described above will be repeated.<br>|
| Probands<br>Children and Teenager of 5-18 years without known obstructive pulmonary diseases | Procedure: probands<br>* Probands will receive the same treatment as patients, but without bronchospasmolysis.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Robustness of change in electrical impedance based on the forced expiratory volume in 1 second (ΔZFEV01) | The robustness of ΔZFEV1.0 (= change in electrical impedance based on the FVC FEV1.0) and τ (= mechanical time constant τ which classifies the regional and global lung mechanics) and their clinical relevance will be investigated. | Baseline | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Correlation between lung function parameters and extracted parameters of the EIT. | The present study aims to verify, whether a correlation between lung function parameters and extracted parameters of the EIT exists. | Baseline | 
| EIT as a diagnostic method for assessment of lung function | It will be examined, whether single EIT measurement can be used for assessment of the lung function. | Baseline | 
| Regional mechanical transmission behavior | Another secondary outcome is the local mechanical transmission behavior as an index of pulmonary status. By using the correlation between results gained from EIT and results from impulse oscillometry (IOS) differentiation between central and peripheral obstruction of respiratory tracts will be proved. | Baseline | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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children, obstructive pulmonary disease, teenager, EIT (Electrical Impedance Tomography)