Forced Oscillation Technique (FOT) and Expiratory Flow Limitation (EFL)

COPD Clinical Trial

Official title:

Diagnosing Expiratory Flow Limitation in COPD Patients With the Forced Oscillation Technique Using Linear Regression in the Time Frequency Domain

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00499304
• Other study ID #: NL13873.09406
• Status: Completed
• Phase: N/A
• First received: July 10, 2007
• Last updated: June 5, 2008
• Start date: November 2006
• Est. completion date: April 2008

Study information

• Verified date: June 2008
• Source: Medical Center Alkmaar
• Contact: n/a
• Is FDA regulated: No
• Health authority: Netherlands: Medical Ethics Review Committee (METC)
• Study type: Observational

Clinical Trial Summary

The aim of this study is to distinguish COPD patients with expiratory flow limitation in body plethysmography (open loop) from the patients without expiratory flow limitation in body plethysmography (closed loop) with the obtained FOT parameters.

Description:

In daily practice the expiratory flow limitation is measured by body plethysmography. An open loop in body plethysmography shows expiratory flow limitation in COPD patients. But body plethysmography requires that the patient quietly sits in a closed box and is not able to follow changes breath by breath. The goal of this study is to validate the Forced oscillation technique (FOT) for measuring expiratory flow limitation in COPD patients.30 COPD patients with an open loop in body plethysmography are compared to 30 COPD patients with a closed loop. The methods used in this study are the maximal overlap discrete short time Fourier transform (MODFT) combined with a total least squares analysis. It is hypothesized that the obtained FOT parameters are able to distinguish the patients with expiratory flow limitation in body plethysmography from the patients without expiratory flow limitation in body plethysmography.Secondary study questions are: 1) to what extend are the FOT parameters distorted by breathing artifacts and measurement noise. 2)What changes can be detected by FOT in expiratory flow limitation after administration of salbutamol.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 60
• Est. completion date: April 2008
• Est. primary completion date: April 2008
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Both
• Age group: 50 Years to 80 Years

Eligibility

Inclusion Criteria:

• Presenting to the outpatient clinic

• Age 50-80 years

• Diagnosed with COPD according to the standard criteria

• Gold Stage II to IV COPD

• Current or ex-smokers (at least 10 PY)

• Stable disease (No current exacerbation or exacerbation during the 4 weeks previous to the inclusion)

Exclusion Criteria:

• History of exacerbation of COPD in the preceding month

• Upper airway obstruction

• Allergic Asthma

• OSAS (obstructive sleep apnea syndrome)

• Extreme obesity (BMI>35)

• Clinically manifest cardiac disease (for example clinically relevant congestive heart failure, unstable angina pectoris)

Study Design

Observational Model: Case Control, Time Perspective: Prospective

Related Conditions & MeSH terms

• COPD

Locations

Country	Name	City	State
Netherlands	Medical Center Alkmaar	Alkmaar

Sponsors (1)

Lead Sponsor	Collaborator
Medical Center Alkmaar

Country where clinical trial is conducted

Netherlands,