The Prevalence of Gastro-oesophageal Reflux in Chronic Lung Disease

This study has been completed.
University of Melbourne
Information provided by (Responsible Party):
Bayside Health Identifier:
First received: September 9, 2005
Last updated: February 12, 2013
Last verified: September 2005

Gastric reflux into the oesophagus may further lung damage in respiratory disease. The proportion of adults with chronic lung disease and gastric reflux is unknown. Adults with this disease regularly complete physiotherapy but the contribution of physiotherapy to reflux is unknown. This study will measure gastric reflux in adults with chronic lung disease, using 24 hour acid monitoring. It is anticipated that approximately 50% of adults with chronic lung disease will have gastric reflux. After monitoring, the number of gastric reflux episodes will be calculated. The results will identify the extent of the gastric reflux problem in these patients and will enable appropriate medical treatment and modifications to physiotherapy, which may improve lung function and quality of life.

Condition Phase
Chronic Obstructive Pulmonary Disease
Phase 1
Phase 2

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: The Prevalence of Gastro-oesophageal Reflux in Chronic Obstructive Pulmonary Disease and Bronchiectasis and the Effects of Medications, Physiotherapy Airway Clearance Techniques and Exercise on Gastro-oesophageal Function.

Resource links provided by NLM:

Further study details as provided by Bayside Health:

Primary Outcome Measures:
  • Prevalence of GOR [ Time Frame: 12 months ] [ Designated as safety issue: No ]

Enrollment: 75
Study Start Date: July 2005
Study Completion Date: June 2009
Primary Completion Date: June 2009 (Final data collection date for primary outcome measure)
Detailed Description:

Research plan:

Fifty-four subjects will be recruited from the Department of AIRMED outpatient clinics at the Alfred Hospital, Melbourne. Subjects will be considered eligible if they have a diagnosis of COPD or bronchiectasis and are clinically stable.

Subjects who give their consent will undergo the following measures:

  1. Demographic data including age, gender, BMI, prescribed medications at time of study.
  2. Structured symptom questionnaire A reliable, valid structured symptom questionnaire which will assess symptomatic GOR.
  3. Health -related quality of life and sleep quality Quality of life will be recorded using a Short form-36, St Georges's Respiratory Questionnaire and Quality of Life in Reflux and Dyspepsia questionnaire.
  4. Dual-channel 24 hour oesophageal pH monitoring

Ambulatory 24 hour oesophageal pH monitoring will be undertaken by all subjects using dual-channel oesophageal pH monitoring equipment. The distal antimony-tipped probe will be sited 5cm above the upper portion of the lower oesophageal sphincter (distal sensor) with the proximal sensor sited 15cm above the distal sensor. The probe is attached to the digitrapper and will record oesophageal pH for 24 hours. The subject will be instructed to activate the digitrapper's three event buttons recording start and finish time of meals, supine versus upright posture and GOR symptoms. The following indices will be measured in the distal and proximal oesophagus:

  • number of reflux episodes,
  • % reflux time,
  • number of long episodes > 5 minutes,
  • duration of the longest episode
  • DeMeester score, a weighted overall score of gastro-oesophageal function.

All subjects will maintain a 24 hour diary recording meals, positions, medications and physiotherapy airway clearance sessions.

During the 24 hour oesophageal pH monitoring, the following interventions will be completed:

  1. Standard Spirometry. Measurement of spirometry will be performed according to the GINA guidelines.
  2. Pepsin Assay. Four sets of samples per subject of sputum and saliva for pepsin analysis will be collected during the study: at study commencement, during the airway clearance session, upon rising in the morning and post exercise testing. EnzChek Protease Assay kit will be used for analysis.
  3. Airway clearance techniques. Each subject with excessive secretions will perform PEP therapy, completing 8 cycles of 10 breaths, 2 forced expirations (huffs) and coughing using a PariPEP device.
  4. Exercise testing. Each subject will complete 2 x Six-Minute-Walk Tests and 3 x Grocery Shelving Tests according to the test protocols.
  5. Actigraphy. Each subject will wear a wrist actigraph on their dominant wrist which will record timing of activity and inactivity, so that sleep quality can be extrapolated. Subjects will also complete a Pittsburgh Sleep Diary during the study.

On study completion, subjects will return for removal of the oesophageal probe and retrieval of the digitrapper. Oesophageal pH study data will be downloaded onto a computer file for analysis. Oral intake, medications, symptoms, positioning, airway clearance and exercise will be extracted from subjective diaries that the subjects maintain, together with quality of life questionnaires and compared with pH recording data. Saliva and sputum pepsin assay results will be correlated with oesophageal pH monitoring data.


Ages Eligible for Study:   20 Years to 80 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population

Adults with COPD and bronchiectasis


Inclusion Criteria:

  • Diagnosis of Chronic obstructive pulmonary disease according to GOLD classification
  • Diagnosis of Bronchiectasis
  • Medically stable, without hospital admission in month prior to study

Exclusion Criteria:

  • diagnosis of asthma, cystic fibrosis, interstitial lung disease
  • known hiatus hernia, oesophageal varices, obstructive sleep apnoea
  • medically unstable for exercise
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00697177

Australia, Victoria
Alfred Hospital
Melbourne, Victoria, Australia, 3004
Sponsors and Collaborators
Bayside Health
University of Melbourne
Principal Investigator: Annemarie L Lee, BPhys, MPhys University of Melbourne
Principal Investigator: Brenda M Button, DPhysio, PhD The Alfred
Study Director: John W Wilson, MBBS, PhD The Alfred
  More Information

No publications provided

Responsible Party: Bayside Health Identifier: NCT00697177     History of Changes
Other Study ID Numbers: 106/05, CTG008/05
Study First Received: September 9, 2005
Last Updated: February 12, 2013
Health Authority: Australia: Human Research Ethics Committee

Keywords provided by Bayside Health:
Gastro-oesophageal reflux
24 hour oesophageal pH monitoring
Physiotherapy Airway clearance techniques

Additional relevant MeSH terms:
Lung Diseases, Obstructive
Pulmonary Disease, Chronic Obstructive
Lung Diseases
Gastroesophageal Reflux
Respiratory Tract Diseases
Bronchial Diseases
Esophageal Motility Disorders
Deglutition Disorders
Esophageal Diseases
Gastrointestinal Diseases
Digestive System Diseases processed this record on September 22, 2014