NDLI: Comparison between the phase angle and phase shift parameters to assess thoracoabdominal asynchrony in COPD patients.

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Comparison between the phase angle and phase shift parameters to assess thoracoabdominal asynchrony in COPD patients.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Cano Porras, Desiderio Lunardi, Adriana C. Marques da Silva, Cibele C. B. Paisani, Denise M. Stelmach, Rafael Moriya, Henrique Takachi Carvalho, Celso R. F.
Description	Author Affiliation: Cano Porras D ( University of Sao Paulo.); Lunardi AC ( University of Sao Paulo.); Marques da Silva CC ( University of Sao Paulo.); Paisani DM ( University of Sao Paulo.); Stelmach R ( University of Sao Paulo.); Moriya HT ( University of Sao Paulo.); Carvalho CR ( School of Medicine cscarval@usp.br.)
Abstract	BACKGROUND: Determining the presence of thoracoabdominal asynchrony in chronic obstructive pulmonary disease patients is clinically relevant, but there is no consensus on the optimal parameters for performing this analysis. METHODS: We assessed 22 COPD patients (FEV 40±10% predicted) and 13 healthy controls during rest and exercise with optoelectronic plethysmography (70% maximum workload) on a cycle ergometer. Thoracoabdominal asynchrony was calculated by using phase angle and phase shift parameters following a three-compartment model involving the upper and lower ribcages and abdomen. Patients were classified as having thoracoabdominal asynchrony (TAA+) or not (TAA-) based on control values (mean±2 standard deviations). The chest wall volume and compartmental contribution were also measured. RESULTS: Thoracoabdominal asynchrony was observed in the lower ribcage. The phase angle detected more TAA+ patients at rest (15 vs. 7 patients) and during exercise (14 vs. 8 patients) compared to the phase shift. TAA+ patients also presented a lower chest wall volume, lower ribcage contribution, and higher abdominal contribution to chest wall volume compared to the control and TAA- patients. CONCLUSION: Thoracoabdominal asynchrony was more detectable during rest and exercise using the phase angle parameter, and it was observed in the lower ribcage compartment, reducing the chest wall volume during exercise in patients with COPD.
File Format	HTM / HTML
ISSN	87507587
e-ISSN	15221601
Journal	Journal of Applied Physiology
Language	English
Publisher	American Physiological Society
Publisher Date	2017-02-09
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Applied Physiology Molecular Biology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Sports Science

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