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Preliminary Study of Dornase Alfa to Treat Chest Infections Post Lung Transplant.

Primary Purpose

Lung Transplant Infection, Lower Respiratory Tract Infection

Status
Completed
Phase
Phase 2
Locations
Australia
Study Type
Interventional
Intervention
Dornase Alfa
Isotonic Saline.
Sponsored by
The Alfred
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional treatment trial for Lung Transplant Infection focused on measuring Lung transplantation, Respiratory Tract Infections, Respiratory Therapy, Isotonic Solutions, Sodium Chloride, Postoperative complications, Postoperative care, dornase alfa

Eligibility Criteria

18 Years - undefined (Adult, Older Adult)All SexesDoes not accept healthy volunteers

Inclusion Criteria:

  • Post bilateral sequential lung transplant
  • Capable of performing airway clearance techniques / nebulisers
  • Pulmonary exacerbation as defined by Fuchs et al
  • Must be productive of sputum
  • Able to provide informed consent within 48 hours of presentation.

    *Fuchs Scale(8): Treatment with / without parenteral antibiotics for 4/12 signs and symptoms:

  • Change in sputum
  • New or increased haemoptysis
  • Increased cough
  • Increased dyspnoea
  • Malaise, fever or lethargy
  • Temp above 38
  • Anorexia or weight loss
  • Sinus pain or tenderness
  • Change in sinus discharge
  • Change in physical examination of the chest
  • Radiographic changes indicative of pulmonary infection
  • Decrease in pulmonary function by 10 % or more

Exclusion Criteria:

  • Paediatric transplant <18yrs
  • Single lung transplant - native lung physiology may confound outcome measures
  • Interstate - unable to complete follow up
  • Unable to perform lung function testing
  • Unable to complete subjective outcome measures- unable to read English fluently
  • Critically unwell / intensive care unit / ventilator dependent
  • Within 2 months of transplant date *Cystic Fibrosis will be stratified

Sites / Locations

  • The Alfred

Arms of the Study

Arm 1

Arm 2

Arm Type

Experimental

Active Comparator

Arm Label

Dornase Alfa

Isotonic Saline

Arm Description

Once daily, 2.5ml inhaled dornase alfa.

Once daily, 5ml inhaled 0.9% normal saline.

Outcomes

Primary Outcome Measures

Lung Clearance Index 2% (LCI2%)
A measure of ventilation inhomogeneity as measured during multiple breath washout (MBW) of inert tracer gases. It has been shown that this test is a potentially more sensitive measure of peripheral airway obstruction than regular spirometry in short term (4 week) mucolytic interventional studies in pediatric Cystic Fibrosis (CF)(17-18). This test would be performed within the respiratory physiology lung function laboratory on site at all assessment points, by an assessor who is blinded to group allocation for follow up data collection. Conventionally used primary endpoints in this population, such as regular spirometry(3), may be unable to detect between group differences without large sample sizes and long treatment durations. Based on current evidence from non-lung transplant populations, LCI has been able to show short-term change, whereas regular spirometry has not shown change(17-18).

Secondary Outcome Measures

Multiple Breath Washout (MBW)
Multiple breath washout is a sensitive measure of respiratory function performed with the subject in a seated position, breathing a fixed tidal volume (1L) of inert gas (nitrogen) from functional residual capacity (FRC) via mouthpiece. Two common outcomes of MBW are Sacin, a measure of gas mixing at the diffusion front, or acinar entrance in the airways, and Scond, in the proximal, conductive zones. An increase in either Sacin or Scond represents an increase in ventilation heterogeneity (deterioration). Both increase with age, normal values are non-zero between 0-0.25(Sacin) and 0-0.1(Scond).
Functional Residual Capacity (FRC)
Volume of air remaining in the lungs after normal expiration.
Forced Expiratory Volume in 1 Second (FEV1) Liters
FEV1 is the maximal amount of air you can forcefully exhale in one second.
Forced Expiratory Volume in 1 Second (FEV1) Percent.
FEV1 is the maximal amount of air you can forcefully exhale in one second.
Forced Vital Capacity (FVC) Liters
Forced vital Capacity (FVC) is a measure of the amount of air someone can forcibly expel out of the lungs after taking a breath to fill the lungs as much as possible.
Forced Vital Capacity (FVC) Percent
Forced vital Capacity (FVC) is a measure of the amount of air someone can forcibly expel out of the lungs after taking a breath to fill the lungs as much as possible.
Forced Expiratory Ratio (FER)
FER represents the proportion of a person's vital capacity that they are able to expire in the first second of forced expiration (FEV1) to the full, forced vital capacity (FVC).
Leicester Cough Questionnaire (LCQ) - Change
Cough specific quality of life questionnaire. The LCQ is a 19-question tool, validated in chronic lung disease other than lung transplant(19). Scale 1-7 for physical, psychological, social. Combined score of 3-21 for total. Lower=worse.
St. George's Respiratory Questionnaire (SGRQ) - Change
The SGRQ is a 2-part questionnaire, validated in chronic lung disease other than lung transplant(20). 50 items, 76 weighted responses. Scores range 0-100, higher=worse.
Inpatient Days
Number of days spent in the acute inpatient setting.
Oral, Inhaled or Intravenous Antibiotic (IVAB) Days.
Antibiotic use for the treatment of lower respiratory tract infections (LRTI) only.
Number of Hospitalizations
Number of admissions to the acute setting.
C-reactive Protein (CRP)
An inflammatory marker measured with routine blood tests on admission with LRTI. Taken during inpatient (IP) stay and routinely on outpatient (OP) follow-up. Existing / available data only will be used - no extra routine bloods will be taken on account of study inclusion.
Breathlessness, Cough and Sputum Scale (BCSS) - Exacerbations
Self-reported symptom severity, used as a daily patient diary. The BCSS is a 12 point self-reported symptom severity score, consisting of 3 sections concerning how much difficulty the subject is having with breathing; subjective cough symptoms and trouble caused by sputum, each scoring between 0-4, combining to a total score of 0-12 (higher=worse). This scale is validated for daily use in Chronic Obstructive Pulmonary Disease (COPD)(21). An exacerbation was defined as an increase in BCSS>1 with ≥5 days preceding stability.
BronkoTest (Sputum Colour) - Purulent Sputum Days
Sputum colour chart. Sputum colour has been shown to correlate with physiological infection in other chronic lung disease groups(22).

Full Information

First Posted
August 31, 2013
Last Updated
July 22, 2019
Sponsor
The Alfred
Collaborators
The Alfred Research Trusts Small Project Grant., Dr Carey Denholm and Laura Denholm
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1. Study Identification

Unique Protocol Identification Number
NCT01952470
Brief Title
Preliminary Study of Dornase Alfa to Treat Chest Infections Post Lung Transplant.
Official Title
Investigating the Role of Nebulised Mucolytic Therapy During Lower Respiratory Tract Infections Post Lung Transplantation.
Study Type
Interventional

2. Study Status

Record Verification Date
July 2019
Overall Recruitment Status
Completed
Study Start Date
October 31, 2013 (Actual)
Primary Completion Date
August 23, 2017 (Actual)
Study Completion Date
August 23, 2017 (Actual)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Principal Investigator
Name of the Sponsor
The Alfred
Collaborators
The Alfred Research Trusts Small Project Grant., Dr Carey Denholm and Laura Denholm

4. Oversight

Data Monitoring Committee
No

5. Study Description

Brief Summary
Patients who have undergone lung transplantation are at an increased risk of developing chest infections due to long-term medication suppressing the immune response. In other chronic lung diseases such as cystic fibrosis (CF) and bronchiectasis, inhaled, nebulised mucolytic medication such as dornase alfa and isotonic saline are often used as part of the management of lung disease characterized by increased or retained secretions. These agents act by making it easier to clear airway secretions, and are currently being used on a case-by-case basis post lung transplantation. To the investigators knowledge, these agents have not been evaluated via robust scientific investigation when used post lung transplant, yet are widely used in routine practice. Patients post lung transplant must be investigated separately as they exhibit differences in physiology that make the clearance of sputum potentially more difficult when compared to other lung diseases. Lower respiratory tract infections are a leading cause of hospital re-admission post lung transplant. Therefore, this highlights the need for a randomized controlled trial. The aim of this study is to assess the efficacy of dornase alfa, compared to isotonic saline, in the management of lower respiratory tract infections post lung transplant. Investigators hypothesize that dornase alfa will be more effective than isotonic saline. The effect of a daily dose of dornase alfa and isotonic saline will be compared over a treatment period of 1 month. Patients admitted to hospital suffering from chest infections characterized by sputum production post lung transplant will be eligible for study inclusion. Patients will be followed up through to 3 months in total to analyze short-medium term lasting effect. Investigators wish to monitor physiological change within the lung non-invasively via lung function analysis whilst assessing patient perceived benefit via cough specific quality of life questionnaires. These measures will be taken at study inclusion and repeated after 1 month and 3 months. Day to day monitoring will be performed via patient symptom diaries, incorporating hospital length of stay and exacerbation rate. The outcomes of this study have the potential to guide clinical decision-making and highlight safe and efficacious therapies.
Detailed Description
According to the International Society for Heart and Lung Transplantation (ISHLT), the incidence of lung transplants per annum worldwide is rising annually, with over 3000 transplants completed according to the latest registry(1). The Alfred is a state-wide, internationally renowned lung transplant service, transplanting between 59 - 79 patients over the last two calendar years, with a wait-list of more than 40 potential recipients. This makes it one of only 7 centres worldwide completing this volume of transplants(1). Patients who have undergone lung transplantation for end-stage lung disease are subject to life-long immunosuppression to prevent allograft rejection. These patients are at a heightened risk of acquiring opportunistic lower respiratory tract infections (LRTI)(2), often characterized by sputum retention and / or production, which can have a negative impact on both morbidity and mortality(3). Patients post lung transplant often find it difficult to clear secretions due to an alteration in normal physiology. Transplanted lung tissue is denervated upon resection from the donor, which has been shown to lead to slower cilial beat frequencies(4), impaired muco-ciliary clearance (MCC) rates(4-6) and an impaired cough reflex(7). Devascularisation to lung tissue post ischaemic surgical time in the acute period can lead to an alteration in mucosal properties and structural changes around anastomoses, which may further impair the ability to clear secretions(3). Inhaled, nebulised mucolytic agents are commonly used in the management of other suppurative chronic lung diseases characterized by excessive production of secretions. Dornase alfa acts by digesting the extracellular deoxyribonucleic acid (DNA) released by inflammatory cells during infection(8). It has been shown to have positive long-term effects on lung function in cystic fibrosis (CF)(8) and short-term benefits treating atelectasis and mucous plugging in acute, non-CF adult and pediatric cases(9-11). Yet shown to be safe in normal subjects(8), it has been shown to have a detrimental effect on pulmonary function in non-CF bronchiectasis(12). Inhaled saline acts by restoring the airway surface liquid layer of the mucosa, favorably altering mucous properties, accelerating MCC and stimulating cough(13-14). Positive evidence exists for hypertonic saline (6-7%) in CF(13-14) and both hypertonic and isotonic (0.9%) saline in non-CF bronchiectasis(15). There is discussion of clinical use of saline as a mucolytic in the post transplant patient(16) with no evidence by way of randomized controlled trial to demonstrate effect. There is no current evidence on the use of inhaled mucolytics post transplant. Currently, both dornase alfa and saline (isotonic / hypertonic) are used in the inpatient and outpatient setting at this institution as a reactive treatment strategy for LRTI characterized by excessive sputum production and / or retention. The investigators believe this warrants a short-term, randomized trial to assess the efficacy of current practice, and to evaluate whether dornase alfa is more effective than 0.9% saline, a cheaper, more accessible alternative. Aim To evaluate the efficacy of inhaled dornase alfa compared to inhaled isotonic (0.9%) saline on: Quantitative and qualitative respiratory outcomes The need for antibiotics, length of stay and exacerbation / re-admission rates Hypothesis Dornase alfa is more effective than isotonic saline in the post lung transplant population during LRTI. Study design Phase 2, assessor blinded, prospective randomized controlled trial. Intervention On admission to the ward as an inpatient, patients who give informed consent within 48 hours of initial presentation will be randomly assigned to one of two groups defined below. The randomization sequence will be concealed using opaque envelopes. Randomization will be stratified according to pre-transplant diagnosis (cystic fibrosis or not) as people with cystic fibrosis are expected to be younger and have a different underlying systemic disease process. All participants will undertake treatment for one month according to their allocated group, with follow up to 3 months, (2 months off randomized intervention). Both groups will continue to do their regular prescribed physical exercise routine over the course of the study. Timing of assessment All outcome measures will be performed at study baseline, 1 month and 3 months follow-up. Daily outcome measures used as a monitoring diary are an exception. There are no cough-specific quality of life questionnaires validated for use in the post lung transplant population. Sample size and power calculation A total of 30 participants (15 in each group) will enter this study. The probability is 80 percent that the study will detect a treatment difference at a two-sided 0.05 significance level, if the true difference between treatments is 1.000 unit in lung clearance index (LCI). This is a conservative estimate that is smaller than previous differences found in pediatric populations(17-18). This is based on the assumption that the standard deviation of the response variable is 0.94 units(17-18). As a phase 2 study, this project is powered to detect differences in physiological outcomes, rather than quality of life or hospitalization. However, should the treatment prove to have physiological benefits, the secondary outcomes of this study will provide critical information for powering a future phase 3 trial. Feasibility: Approximately 12 patients with pulmonary exacerbations are admitted under the lung transplant service each month (minimum estimate). Investigators estimate that 70% will meet the eligibility criteria for the study and 50% will consent to participate. It is therefore anticipated that it will be possible to recruit the numbers needed for this study in 8 months. Statistical analysis An intention to treat analysis will be conducted, with inclusion of all randomized participants, regardless of study completion. Data for continuous outcomes including LCI will be analyzed using a linear mixed models analysis, which makes use of all available data at each time point and is less affected by incomplete data than analysis of variance. The likelihood of exacerbation or hospitalization during the follow-up period for the dornase alpha group will be expressed as a relative risk compared to the isotonic saline group. Bias / Confounders There is potential for performance bias in this study due to the lack of ability to blind participants to their allocated treatment regimen. Investigators are unable to package medications in a way other than that currently produced. It is the aim to outline, as part of the participant information and consent form (PICF), that both inhaled medications have proven to be efficacious (and detrimental in certain circumstances) in disease processes other than post lung transplant LRTI. Detection bias will be controlled by the use of a blinded outcome assessor for all follow-up data collection points. Potential confounders in this study include the diagnosis of bronchiolitis obliterans (BOS), or chronic lung rejection, during which LRTI occurs simultaneously. Patients with a diagnosis of BOS may in fact demonstrate differences in lung physiology and ease of sputum expectoration, which may have an effect on outcomes variables. We feel that excluding these patients may have a detrimental impact on the external validity of this study, therefore we will stratify patients according to a diagnosis of BOS on study inclusion. Outcomes and Significance This will be the first randomized controlled trial to analyze inhaled dornase alfa and isotonic saline in the post lung transplant population. The outcome of this trial will help to guide physiotherapy and pharmacological management of post lung transplant patients with LRTI in the future, both nationally and internationally.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Lung Transplant Infection, Lower Respiratory Tract Infection
Keywords
Lung transplantation, Respiratory Tract Infections, Respiratory Therapy, Isotonic Solutions, Sodium Chloride, Postoperative complications, Postoperative care, dornase alfa

7. Study Design

Primary Purpose
Treatment
Study Phase
Phase 2
Interventional Study Model
Parallel Assignment
Masking
Outcomes Assessor
Allocation
Randomized
Enrollment
32 (Actual)

8. Arms, Groups, and Interventions

Arm Title
Dornase Alfa
Arm Type
Experimental
Arm Description
Once daily, 2.5ml inhaled dornase alfa.
Arm Title
Isotonic Saline
Arm Type
Active Comparator
Arm Description
Once daily, 5ml inhaled 0.9% normal saline.
Intervention Type
Drug
Intervention Name(s)
Dornase Alfa
Other Intervention Name(s)
Pulmozyme.
Intervention Description
Once daily, 2.5ml inhaled dornase alfa (evening if able) with inhalational breathing routine (IBR). IBR consists of 4 slow deep breaths followed by 6 relaxed breaths, repeated until nebuliser is complete, coughing when the patient feels the need to expectorate. The patient will be instructed to sit in an upright position with upper limb support as able.
Intervention Type
Drug
Intervention Name(s)
Isotonic Saline.
Other Intervention Name(s)
normal, 0.9% saline.
Intervention Description
Once daily, 5ml inhaled 0.9% normal saline (evening if able) with inhalational breathing routine (IBR). IBR consists of 4 slow deep breaths followed by 6 relaxed breaths, repeated until nebuliser is complete, coughing when the patient feels the need to expectorate. The patient will be instructed to sit in an upright position with upper limb support as able.
Primary Outcome Measure Information:
Title
Lung Clearance Index 2% (LCI2%)
Description
A measure of ventilation inhomogeneity as measured during multiple breath washout (MBW) of inert tracer gases. It has been shown that this test is a potentially more sensitive measure of peripheral airway obstruction than regular spirometry in short term (4 week) mucolytic interventional studies in pediatric Cystic Fibrosis (CF)(17-18). This test would be performed within the respiratory physiology lung function laboratory on site at all assessment points, by an assessor who is blinded to group allocation for follow up data collection. Conventionally used primary endpoints in this population, such as regular spirometry(3), may be unable to detect between group differences without large sample sizes and long treatment durations. Based on current evidence from non-lung transplant populations, LCI has been able to show short-term change, whereas regular spirometry has not shown change(17-18).
Time Frame
1 month, 3 months
Secondary Outcome Measure Information:
Title
Multiple Breath Washout (MBW)
Description
Multiple breath washout is a sensitive measure of respiratory function performed with the subject in a seated position, breathing a fixed tidal volume (1L) of inert gas (nitrogen) from functional residual capacity (FRC) via mouthpiece. Two common outcomes of MBW are Sacin, a measure of gas mixing at the diffusion front, or acinar entrance in the airways, and Scond, in the proximal, conductive zones. An increase in either Sacin or Scond represents an increase in ventilation heterogeneity (deterioration). Both increase with age, normal values are non-zero between 0-0.25(Sacin) and 0-0.1(Scond).
Time Frame
1 month, 3 months
Title
Functional Residual Capacity (FRC)
Description
Volume of air remaining in the lungs after normal expiration.
Time Frame
1 month, 3 months
Title
Forced Expiratory Volume in 1 Second (FEV1) Liters
Description
FEV1 is the maximal amount of air you can forcefully exhale in one second.
Time Frame
1 month, 3 months.
Title
Forced Expiratory Volume in 1 Second (FEV1) Percent.
Description
FEV1 is the maximal amount of air you can forcefully exhale in one second.
Time Frame
1 month, 3 months
Title
Forced Vital Capacity (FVC) Liters
Description
Forced vital Capacity (FVC) is a measure of the amount of air someone can forcibly expel out of the lungs after taking a breath to fill the lungs as much as possible.
Time Frame
1 month, 3 months
Title
Forced Vital Capacity (FVC) Percent
Description
Forced vital Capacity (FVC) is a measure of the amount of air someone can forcibly expel out of the lungs after taking a breath to fill the lungs as much as possible.
Time Frame
1 month, 3 months
Title
Forced Expiratory Ratio (FER)
Description
FER represents the proportion of a person's vital capacity that they are able to expire in the first second of forced expiration (FEV1) to the full, forced vital capacity (FVC).
Time Frame
1 month, 3 months
Title
Leicester Cough Questionnaire (LCQ) - Change
Description
Cough specific quality of life questionnaire. The LCQ is a 19-question tool, validated in chronic lung disease other than lung transplant(19). Scale 1-7 for physical, psychological, social. Combined score of 3-21 for total. Lower=worse.
Time Frame
1 month, 3 months.
Title
St. George's Respiratory Questionnaire (SGRQ) - Change
Description
The SGRQ is a 2-part questionnaire, validated in chronic lung disease other than lung transplant(20). 50 items, 76 weighted responses. Scores range 0-100, higher=worse.
Time Frame
1 month, 3 months.
Title
Inpatient Days
Description
Number of days spent in the acute inpatient setting.
Time Frame
Across study period (3 months).
Title
Oral, Inhaled or Intravenous Antibiotic (IVAB) Days.
Description
Antibiotic use for the treatment of lower respiratory tract infections (LRTI) only.
Time Frame
Over study period (3 months).
Title
Number of Hospitalizations
Description
Number of admissions to the acute setting.
Time Frame
Over study period (3 months).
Title
C-reactive Protein (CRP)
Description
An inflammatory marker measured with routine blood tests on admission with LRTI. Taken during inpatient (IP) stay and routinely on outpatient (OP) follow-up. Existing / available data only will be used - no extra routine bloods will be taken on account of study inclusion.
Time Frame
1 month, 3 months.
Title
Breathlessness, Cough and Sputum Scale (BCSS) - Exacerbations
Description
Self-reported symptom severity, used as a daily patient diary. The BCSS is a 12 point self-reported symptom severity score, consisting of 3 sections concerning how much difficulty the subject is having with breathing; subjective cough symptoms and trouble caused by sputum, each scoring between 0-4, combining to a total score of 0-12 (higher=worse). This scale is validated for daily use in Chronic Obstructive Pulmonary Disease (COPD)(21). An exacerbation was defined as an increase in BCSS>1 with ≥5 days preceding stability.
Time Frame
Daily up to 3 months.
Title
BronkoTest (Sputum Colour) - Purulent Sputum Days
Description
Sputum colour chart. Sputum colour has been shown to correlate with physiological infection in other chronic lung disease groups(22).
Time Frame
Daily up to 3 months.

10. Eligibility

Sex
All
Minimum Age & Unit of Time
18 Years
Accepts Healthy Volunteers
No
Eligibility Criteria
Inclusion Criteria: Post bilateral sequential lung transplant Capable of performing airway clearance techniques / nebulisers Pulmonary exacerbation as defined by Fuchs et al Must be productive of sputum Able to provide informed consent within 48 hours of presentation. *Fuchs Scale(8): Treatment with / without parenteral antibiotics for 4/12 signs and symptoms: Change in sputum New or increased haemoptysis Increased cough Increased dyspnoea Malaise, fever or lethargy Temp above 38 Anorexia or weight loss Sinus pain or tenderness Change in sinus discharge Change in physical examination of the chest Radiographic changes indicative of pulmonary infection Decrease in pulmonary function by 10 % or more Exclusion Criteria: Paediatric transplant <18yrs Single lung transplant - native lung physiology may confound outcome measures Interstate - unable to complete follow up Unable to perform lung function testing Unable to complete subjective outcome measures- unable to read English fluently Critically unwell / intensive care unit / ventilator dependent Within 2 months of transplant date *Cystic Fibrosis will be stratified
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Benjamin J Tarrant, B.Physio
Organizational Affiliation
The Alfred
Official's Role
Principal Investigator
Facility Information:
Facility Name
The Alfred
City
Melbourne
State/Province
Victoria
ZIP/Postal Code
3000
Country
Australia

12. IPD Sharing Statement

Plan to Share IPD
No
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14665499
Citation
Leidy NK, Rennard SI, Schmier J, Jones MK, Goldman M. The breathlessness, cough, and sputum scale: the development of empirically based guidelines for interpretation. Chest. 2003 Dec;124(6):2182-91. doi: 10.1378/chest.124.6.2182.
Results Reference
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PubMed Identifier
11312405
Citation
Stockley RA, Bayley D, Hill SL, Hill AT, Crooks S, Campbell EJ. Assessment of airway neutrophils by sputum colour: correlation with airways inflammation. Thorax. 2001 May;56(5):366-72. doi: 10.1136/thorax.56.5.366.
Results Reference
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Preliminary Study of Dornase Alfa to Treat Chest Infections Post Lung Transplant.

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