1. Estimation of bilateral asynchrony between diaphragm mechanomyographic signals in patients with Chronic Obstructive Pulmonary Disease
- Author
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Joaquim Gea, Raimon Jane, José Antonio Fiz, Juana Martínez-Llorens, Luis Estrada, Leonardo Sarlabous, Abel Torres, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Sistemes, Automàtica i Informàtica Industrial, Institut de Bioenginyeria de Catalunya, and Universitat Politècnica de Catalunya. BIOSPIN - Biomedical Signal Processing and Interpretation
- Subjects
Male ,Pulmons -- Malalties obstructives ,Diseases ,Electromyography ,Pneumodynamics ,IP networks ,Pulmonary Disease, Chronic Obstructive ,Medicine ,Respiratory system ,Lung ,Fatigue ,Enginyeria biomèdica::Electrònica biomèdica [Àrees temàtiques de la UPC] ,Rib cage ,COPD ,Lungs--Diseases, Obstructive ,medicine.diagnostic_test ,Signal Processing, Computer-Assisted ,Middle Aged ,Transforms ,Diaphragm (structural system) ,Asynchrony (computer programming) ,medicine.anatomical_structure ,Hilbert transforms ,Respiració -- Mesurament ,Medical signal processing ,Cardiology ,Muscle ,Algorithms ,medicine.medical_specialty ,Ciències de la salut::Medicina [Àrees temàtiques de la UPC] ,Diaphragm ,Pulmonary disease ,Bioengineering ,Internal medicine ,Respiratory muscles ,Humans ,Thoracic Wall ,Aged ,Respiratory organs--Diseases--Research ,business.industry ,medicine.disease ,Enginyeria de la telecomunicació::Processament del senyal [Àrees temàtiques de la UPC] ,Insuficiència respiratòria ,Physical therapy ,Accelerometers ,business ,Estimation ,Protocols - Abstract
The aim of the present study was to measure bilateral asynchrony in patients suffering from Chronic Obstructive Pulmonary Disease (COPD) performing an incremental inspiratory load protocol. Bilateral asynchrony was estimated by the comparison of respiratory movements derived from diaphragm mechanomyographic (MMGdi) signals, acquired by means of capacitive accelerometers placed on left and right sides of the rib cage. Three methods were considered for asynchrony evaluation: Lissajous figure, Hilbert transform and Motto's algorithm. Bilateral asynchrony showed an increase at 20, 40 and 60% (values of normalized inspiratory pressure by their maximum value reached in the last inspiratory load) while the very severe group showed and increase at 20, 40, 80, and 100 % during the protocol. These increments in the phase's shift can be due to an increase of the inspiratory load along the protocol, and also as a consequence of distress and fatigue. In summary, this work evidenced the capability to estimate bilateral asynchrony in COPD patients. These preliminary results also showed that the use of capacitive accelerometers can be a suitable sensor for recording of respiratory movement and evaluation of asynchrony in COPD patients.
- Published
- 2014
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