Forced oscillation technique (FOT) in the evaluation of COPD patients enrolled in Pulmonary Rehabilitation (PR)

2019 ◽  
Author(s):  
Isabella Romagnoli ◽  
Barbara Lanini ◽  
Elisa Chellini ◽  
Claudia Mannini ◽  
Barbara Binazzi ◽  
...  
Keyword(s):  
Pulmonary Rehabilitation ◽  
Forced Oscillation ◽  
Forced Oscillation Technique ◽  
Copd Patients

scholarly journals The Clinical Utility of Forced Oscillation Technique (FOT) during Hospitalisation in patients with exacerbation of COPD

2021 ◽  
pp. 00448-2021
Author(s):  
Jaber S. Alqahtani ◽  
Ahmad M. Al Rajeh ◽  
Abdulelah M. Aldhahir ◽  
Yousef S. Aldabayan ◽  
John R. Hurst ◽  
...  
Keyword(s):  
Supine Position ◽  
Forced Oscillation ◽  
Airflow Limitation ◽  
Forced Oscillation Technique ◽  
Clinical Value ◽  
Expiratory Flow Limitation ◽  
Copd Patients ◽  
Patient Reported ◽  
Independent Technique ◽  
Exacerbation Of Copd

BackgroundForced Oscillation Technique (FOT) is an innovative tool to measure within-breath reactance at 5 Hz (ΔXrs5Hz) but its feasibility and utility in acute exacerbations of COPD (AECOPD) is understudied.MethodsA prospective observational study was conducted in 82 COPD patients admitted due to AECOPD. FOT indices were measured and the association between these indices and spirometry, peak inspiratory flow rate, blood inflammatory biomarkers and patient-reported outcomes including assessment of dyspnoea, quality of life; anxiety and depression and frailty at admission and discharge were explored.ResultsAll patients were able to perform FOT in both sitting and supine position. The prevalence of expiratory flow limitation (EFL) in the upright position was 39% (32/82) and increased to 50% (41/82) in the supine position. EFL (measured by ΔXrs5Hz) and resistance at 5 Hz (Rrs5Hz) negatively correlated with FEV1; those with EFL had lower FEV1 (0.74±0.30 versus 0.94±0.36 L, p=0.01) and FVC (1.7 ±0.55 versus 2.1 ±0.63 L, p= 0.009) and higher BMI [27 (21–36) versus 23 (19–26) kg/m2, p=0.03] compared to those without EFL. During recovery from AECOPD, changes in EFL was observed in association with improvement in breathlessness.ConclusionFOT was easily used to detect EFL during hospitalisation due to AECOPD. The prevalence of EFL increased when patients moved from a seated to a supine position and EFL was negatively correlated with airflow limitation. Improvements in EFL were associated with a reduction in breathlessness. FOT is of potential clinical value by providing a non-invasive, objective, and effort-independent technique to measure lung function parameters during AECOPD requiring hospital admission.

scholarly journals Long-term change in reactance by forced oscillation technique correlates with FEV1 decline in moderate COPD patients

2017 ◽  
Vol 49 (4) ◽  
pp. 1601534 ◽  
Author(s):  
Takefumi Akita ◽  
Toshihiro Shirai ◽  
Taisuke Akamatsu ◽  
Mika Saigusa ◽  
Akito Yamamoto ◽  
...  
Keyword(s):  
Forced Oscillation ◽  
Forced Oscillation Technique ◽  
Copd Patients ◽  
Term Change ◽  
Fev1 Decline

scholarly journals Variability of within-breath reactance in COPD patients and its association with dyspnoea

2014 ◽  
Vol 45 (3) ◽  
pp. 625-634 ◽  
Author(s):  
Bernt B. Aarli ◽  
Peter M.A. Calverley ◽  
Robert L. Jensen ◽  
Tomas M.L. Eagan ◽  
Per S. Bakke ◽  
...  
Keyword(s):  
Continuous Measurement ◽  
Medical Research Council ◽  
Forced Oscillation ◽  
Chronic Obstructive ◽  
Forced Oscillation Technique ◽  
Flow Limitation ◽  
Oscillation System ◽  
Expiratory Flow Limitation ◽  
Obstructive Pulmonary Disease ◽  
Copd Patients

The forced oscillation technique can identify expiratory flow limitation (EFL) when a large difference in inspiratory and expiratory reactance (ΔXrs) occurs. However, flow limitation can vary from breath to breath, and so we compared a multiple-breath ΔXrs approach to the traditional breath-by-breath assessment of EFL. We investigated the within- and between-day reproducibility and the factors that affect the size of ΔXrs when used as a continuous measurement over multiple breaths. In addition, we examined how multiple-breath ΔXrs relates to the sensation of breathlessness.425 moderate to very severe chronic obstructive pulmonary disease (COPD) patients and 229 controls were included. Spirometry and impedance measurements were performed on a MasterScope CT Impulse Oscillation System.Median ΔXrs approached zero in healthy controls with little variation between measurements. COPD patients generally had higher ΔXrs and higher variability. The COPD patients with ΔXrs >0.1 kPa·L−1·s−1 were prone to be more breathless and had a higher modified Medical Research Council dyspnoea scale score. In controls, the 95th percentile of ΔXrs was as low as 0.07 kPa·L−1·s−1.We describe a new method to assess EFL at a patient level and propose a cut-off, mean ΔXrs >0.1 kPa·L−1·s−1, as a way to identify COPD patients who are more likely to report dyspnoea.

scholarly journals Effects of a Rehabilitation Programme Using a Nasal Inspiratory Restriction Device in COPD

2021 ◽  
Vol 18 (8) ◽  
pp. 4207
Author(s):  
Jose L. Gonzalez-Montesinos ◽  
Jorge R. Fernandez-Santos ◽  
Carmen Vaz-Pardal ◽  
Jesus G. Ponce-Gonzalez ◽  
Alberto Marin-Galindo ◽  
...  
Keyword(s):  
Pulmonary Rehabilitation ◽  
Rehabilitation Programme ◽  
Group Differences ◽  
Control Group ◽  
Chronic Obstructive ◽  
Maximum Value ◽  
Copd Patients ◽  
Significant Difference ◽  
Pulmonary Rehabilitation Programme ◽  
Positive Increment

Chronic obstructive pulmonary disease (COPD) patients are characterised for presenting dyspnea, which reduces their physical capacity and tolerance to physical exercise. The aim of this study was to analyse the effects of adding a Feel-Breathe (FB) device for inspiratory muscle training (IMT) to an 8-week pulmonary rehabilitation programme. Twenty patients were randomised into three groups: breathing with FB (FBG), oronasal breathing without FB (ONBG) and control group (CG). FBG and ONBG carried out the same training programme with resistance, strength and respiratory exercises for 8 weeks. CG did not perform any pulmonary rehabilitation programme. Regarding intra group differences in the value obtained in the post-training test at the time when the maximum value in the pre-training test was obtained (PostPRE), FBG obtained lower values in oxygen consumption (VO2, mean = −435.6 mL/min, Bayes Factor (BF10) > 100), minute ventilation (VE, −8.5 L/min, BF10 = 25), respiratory rate (RR, −3.3 breaths/min, BF10 = 2), heart rate (HR, −13.7 beats/min, BF10 > 100) and carbon dioxide production (VCO2, −183.0 L/min, BF10 = 50), and a greater value in expiratory time (Tex, 0.22 s, BF10 = 12.5). At the maximum value recorded in the post-training test (PostFINAL), FBG showed higher values in the total time of the test (Tt, 4.3 min, BF10 = 50) and respiratory exchange rate (RER, 0.05, BF10 = 1.3). Regarding inter group differences at PrePOST, FBG obtained a greater negative increment than ONBG in the ventilatory equivalent of CO2 (EqCO2, −3.8 L/min, BF10 = 1.1) and compared to CG in VE (−8.3 L/min, BF10 = 3.6), VCO2 (−215.9 L/min, BF10 = 3.0), EqCO2 (−3.7 L/min, BF10 = 1.1) and HR (−12.9 beats/min, BF10 = 3.4). FBG also showed a greater PrePOST positive increment in Tex (0.21 s, BF10 = 1.4) with respect to CG. At PreFINAL, FBG presented a greater positive increment compared to CG in Tt (4.4 min, BF10 = 3.2) and negative in VE/VCO2 intercept (−4.7, BF10 = 1.1). The use of FB added to a pulmonary rehabilitation programme in COPD patients could improve tolerance in the incremental exercise test and energy efficiency. However, there is only a statically significant difference between FBG and ONBG in EqCO2. Therefore, more studies are necessary to reach a definitive conclusion about including FB in a pulmonary rehabilitation programme.

Pulmonary Rehabilitation in COPD Patients with Elevated PCO2

1988 ◽  
Vol 138 (6) ◽  
pp. 1519-1523 ◽  
Author(s):  
Steven Foster ◽  
Deborah Lopez ◽  
Henry M. Thomas
Keyword(s):  
Pulmonary Rehabilitation ◽  
Elevated Pco2 ◽  
Copd Patients
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