Forced Oscillation and Breathing Pattern in Asthma

NCT06272773 | Not Yet Recruiting

• 1 other identifier: IRAS Ref: 333663
• Study Type: observational
• Target: 65
• Locations: 0 countries
• Sites: N/A

Brief Summary

Asthma is a chronic respiratory disease characterised by airway inflammation, bronchoconstriction, and airway hyperresponsiveness. Accurate and reliable assessment of lung function is crucial in diagnosing and monitoring asthma. The forced oscillation technique (FOT) is a non-invasive method that has gained attention in recent years as a valuable tool for evaluating respiratory mechanics in asthma. FOT involves applying small amplitude oscillations at various frequencies to the respiratory system and measuring the resulting pressure and flow responses. These measurements provide valuable insights into the mechanical properties of the airways, including resistance, compliance, and reactance. FOT offers several advantages over traditional spirometry, such as its ability to assess peripheral airway function, sensitivity to small airway abnormalities, and ease of use, particularly in young children or individuals with severe airflow limitation. FOT also allows for assessment of respiratory mechanics in individuals who may struggle with performing spirometry manoeuvres. However, it is unclear whether a change in breathing pattern in patients with obstructive lung disease impacts the assessment of a response to treatment utilising FOT. Several studies have demonstrated a high prevalence of Breathing Pattern Disorders (BPDs) in individuals with asthma. These findings suggest that BPDs may be common in asthma and could contribute to the manifestation and severity of respiratory symptoms. Evidence suggests that BPDs can adversely affect pulmonary function in individuals with asthma. One study demonstrated that children with asthma and dysfunctional breathing exhibited significantly reduced forced expiratory volume in one second (FEV1) compared to asthmatics without BPD. This suggests that abnormal breathing patterns may contribute to airflow limitation in asthma, leading to decreased lung function. We therefore wish to determine the impact of different breathing frequencies on parameters measured using FOT in patients diagnosed with asthma and concomitant obstructive lung function abnormality.

Conditions

Asthma

Outcome Measures

Primary Outcomes (1)

• Change in airway resistance at 5 Hertz (Hz) and 19Hz

  To assess the affect of a change in breathing frequency on FOT measurements, specifically airway resistance at 5Hz and 19Hz, in patients with a known diagnosis of asthma.

  20 mins

Interventions

Forced Oscillation Test DEVICE

Participant will breathe normally through the device which sends different frequency sounds into the airways, monitoring the response coming back from central and peripheral airways to calculate airway impedence, reactance and resistance.

Eligibility Criteria

• Age: 18 Years - 100 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Non-Probability Sample

Study Population

Patients with physician-diagnosed asthma and demonstrable obstructive lung disease.

You may qualify if:

• Age \> 18years Confirmed diagnosis of asthma Evidence of obstructive lung disease, FEV1/forced vital capacity (FVC) \<lower limit of normal (LLN)

You may not qualify if:

• Unstable/Uncontrolled asthma, as designated by the patient's consultant Known breathing pattern disorder Inability to cooperate with instructions Refusal to give informed consent

Sponsors & Collaborators

• Karl Sylvester: lead

MeSH Terms

Conditions

Asthma

Condition Hierarchy (Ancestors)

Bronchial Diseases; Respiratory Tract Diseases; Lung Diseases, Obstructive; Lung Diseases; Respiratory Hypersensitivity; Hypersensitivity, Immediate; Hypersensitivity; Immune System Diseases

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: SPONSOR INVESTIGATOR
• PI Title: Consultant Healthcare Scientist

Study Record Dates

• First Submitted: February 16, 2024
• First Posted: February 22, 2024
• Study Start: March 1, 2024
• Primary Completion: October 1, 2024
• Study Completion: March 1, 2025
• Last Updated: February 22, 2024

Record last verified: 2024-02