ANZCTR - Registration

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Trial registered on ANZCTR

Registration number

ACTRN12611000874910

Ethics application status

Approved

Date submitted

15/08/2011

Date registered

16/08/2011

Date last updated

23/11/2016

Type of registration

Prospectively registered

Titles & IDs

Public title

Optimal Therapy for Obesity Hypoventilation Syndrome

Scientific title

A comparison of the effect of bi-level ventilatory support versus continuous positive airway pressure on the rates of treatment failure in patients with stable obesity hypoventilation syndrome

Secondary ID [1]

Nil known

Universal Trial Number (UTN)

Trial acronym

Linked study record

Health condition

Health condition(s) or problem(s) studied:

Obesity hypoventilation syndrome

Condition category

Condition code

Respiratory

Other respiratory disorders / diseases

Diet and Nutrition

Obesity

Intervention/exposure

Study type

Interventional

Description of intervention(s) / exposure

Two commonly used non-invasive ventilation strategies in the respiratory management of patients with stable Obesity Hypoventilation Syndrome will be compared.
i) Bilevel PAP (positive airway pressure): use of bilevel ventilation set in a spontaneous-timed mode versus
ii) CPAPplus: Initial treatment with continuous positive airway pressure (CPAP), with progressive escalation of ventilatory support in case of treatment failure to spontaneous bilevel PAP and then bilevel in the spontaneous-timed mode if needed.
Note
i) Bilevel PAP involves the delivery of positive pressure through a nasal mask. The pressure delivered during inspiration is higher than that during expiration. These pressures act to "splint" the upper airway open and to increase the size of each assisted breath. The pressures used are estimated during a daytime familiarisation trial and confirmed during an overnight sleep study. The mask and device are to be used every night during sleep throughout the study period, ie 12 months. The delivered pressures will be in the range of 4-30cm H2O as observed in usual clinical practice.

ii) CPAP involves the delivery of a constant positive pressure through a nasal mask. The pressure delivered is constant across both inspiration and expiration. This pressure act to "splint" the upper airway open during sleep. The pressures used are estimated during a daytime familiarisation trial and confirmed during an overnight sleep study. The mask and device are to be used every night throughout the study period, ie 12 months. The delivered pressures will be in the range of 4-30cm H2O as observed in usual clinical practice.

Primary endpoint will be made at 3 months, with secondary endpoint at 12 months

Intervention code [1]

Treatment: Other

Intervention code [2]

Treatment: Devices

Comparator / control treatment

As above. Comparison of two different, current treatment strategies

Control group

Active

Outcomes

Primary outcome [1]

Treatment failure defined as any one or more of the following;
a) Failure of awake PaCO2 to fall below 60mmHg within 3 months of commencing treatment or a rise of >10mmHg in daytime, awake PaCO2 at any time compare to that at randomization
b) Admission to hospital for respiratory deterioration (worsening respiratory failure, dyspnoea, right heart failure or severe sleepiness)
c) The patient abandons or is non-adherent with PAP therapy, defined as average nightly use <2hrs/night since last review, on 2 consecutive reviews (ie persisting after efforts to trouble shoot reasons for poor adherence).

Timepoint [1]

Three and 12 months

Secondary outcome [1]

Changes in awake blood gases

Timepoint [1]

one, three and 12 months

Secondary outcome [2]

Treatment compliance. This will be assessed by reading the "time at pressure" data from the positive pressure device. These data are automatically logged by the devices.

Timepoint [2]

one, three and 12 months

Secondary outcome [3]

Healthcare utilization and need for hospital admissions. Detailed questionnaire data will be collected monthly regarding participants use of health services. The economic evaluation proposed here is a within-trial analysis and will rely primarily on direct observation of treatment compliance, hospitalisations, healthcare utilization and quality of life in the trial population. All of these data will be gathered within the trial (monthly telephone calls, local hospital records, compliance data recorded by the bilevel device and quality of life questionnaires completed by participants). Results from the economic evaluation will be expressed as additional costs (savings) per SRI responder and costs(savings) per QALY gained.

Timepoint [3]

one, three and 12 months

Secondary outcome [4]

Changes in quality of life and sleepiness
Quality of life (QoL) - This will be measured with two questionnaires. The first is the Severe Respiratory Insufficiency (SRI) questionnaire; a disease specific QoL measure, specifically for use in people with chronic respiratory failure. The SF-36 is a generic health-related quality of life measure. The SF-36 data will also be transformed into the SF6D to calculate health utility values (and quality-adjusted life years) for the economic evaluation.
Daytime sleepiness - The Epworth Sleepiness Scale (ESS) is an 8 point questionnaire routinely used in patients with sleep and breathing disorders, and will be administered to measure the subject?s propensity to fall asleep during various routine daytime activities

Timepoint [4]

one, three and 12 months

Secondary outcome [5]

Differences between groups in physical activity following therapy.
a) Subjects will be asked to wear the SenseWear Pro3 Armband (SWA, Bodymedia, Pittsburgh, USA) for a seven day period (including weekend days) to document physical activity levels. This monitor is approved by the TGA (175835 Emergo Asia Pacific Pty Ltd - Patient data recorder, long-term, physical activity).
The monitor is worn over the upper part of the right arm and provides estimates of energy and step count. These estimates are made non-invasively using thin inbuilt bi-axial accelerometer, galvanic skin resistance plus sensors for heat flux, galvanic skin response and near-body ambient temperature. The number of non-sedentary minutes per day (energy expenditure >1.5METS) will be calculated.

Timepoint [5]

Three months

Eligibility

Key inclusion criteria

Primary diagnosis of Obesity Hypoventilation Syndrome
Body mass index >30kg.m-2
Daytime respiratory failure with a PaCO2>45mmHg
At randomization, pH is in the normal range for chronic hypercapnia
FEV1/FVC ratio >70%

Minimum age

18 Years

Maximum age

No limit

Sex

Both males and females

Can healthy volunteers participate?

Key exclusion criteria

Hypoventilation attributable to other causes eg neuromuscular disease, chest wall abnormalities, multiple medications with sedative/respiratory depressant side-effects
Physician diagnosed chronic obstructive pulmonary disease
Has used non-invasive ventilation (Bilevel PAP or CPAP) for more than one month in the previous 3 months.
Not proficient in English
Inability to provide informed consent

Study design

Purpose of the study

Treatment

Allocation to intervention

Randomised controlled trial

Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)

Methods used to generate the sequence in which subjects will be randomised (sequence generation)

Masking / blinding

Who is / are masked / blinded?

Intervention assignment

Other design features

Phase

Type of endpoint/s

Statistical methods / analysis

Recruitment

Recruitment status

Completed

Date of first participant enrolment

Anticipated

1/09/2011

Actual

1/11/2011

Date of last participant enrolment

Anticipated

Actual

31/12/2013

Date of last data collection

Anticipated

Actual

30/06/2014

Sample size

Target

Accrual to date

Final

Recruitment in Australia

Recruitment state(s)

NSW,VIC

Funding & Sponsors

Funding source category [1]

Charities/Societies/Foundations

Name [1]

ResMed Foundation

Address [1]

PO Box 2448, San Diego, CA 92038, USA

Country [1]

United States of America

Primary sponsor type

Charities/Societies/Foundations

Name

Institute for Breathing and Sleep

Address

Bowen Centre. Austin Health
PO Box 5555 Heidelberg
3084 Vic

Country

Australia

Secondary sponsor category [1]

Charities/Societies/Foundations

Name [1]

ResMed foundation

Address [1]

PO Box 2448, San Diego, CA 92038, USA

Country [1]

United States of America

Ethics approval

Ethics application status

Approved

Ethics committee name [1]

Austin Health Human Ethics Research Committee

Ethics committee address [1]

Ethics committee country [1]

Australia

Date submitted for ethics approval [1]

01/08/2011

Approval date [1]

06/10/2011

Ethics approval number [1]

Summary

Brief summary

Not being able to breath enough overnight is a major problem for an increasing number of Australians with obesity.
Obesity hypoventilation syndrome, as this problem is known, is now the major reason for complex, overnight
breathing support in Australia. This potentially fatal disease can be managed using two different strategies; a
cheaper, simpler option available to more people or a more expensive approach that requires specialised services.
The more complex approach may not be better if fewer people are able to take advantage of it.
In this twelve month study, people with obesity hypoventilation syndrome will be randomised (like flipping a coin) to receive either the simple or the complex way of managing the disease. The primary question we are looking to answer is whether the more complex approach is really better than the simpler one. Specifically, the study will determine which treatment is better for patients in terms of quality of life, blood test results and and how easily they can get out and about. The study will also help establish which of these approaches is more cost-effective for the community.

Trial website

Trial related presentations / publications


Howard, M. E., A. J. Piper, B. Stevens, A. E. Holland, B. J. Yee, E. Dabscheck, D. Mortimer, A. T. Burge, D. Flunt, C. Buchan, L. Rautela, N. Sheers, D. Hillman and D. J. Berlowitz (2016). "A randomised controlled trial of CPAP versus non-invasive ventilation for initial treatment of obesity hypoventilation syndrome." Thorax.

Public notes

Contacts

Principal investigator

Name

Prof David Hillman

Address

Sir Charles Gairdner Hospital
1st Floor, G Block / Hospital Avenue,
Nedlands, WA 6009

Country

Australia

Phone

+61 8 9346 3011

Fax

david.hillman@health.wa.gov.au

Contact person for public queries

Name

David Berlowitz

Address

Institute for Breathing and Sleep
Bowen Centre. Austin Health
PO Box 5555
Heidelberg. 3084 Vic

Country

Australia

Phone

+61 3 9496 3871

Fax

david.berlowitz@austin.org.au

Contact person for scientific queries

Name

David Berlowitz

Address

Institute for Breathing and Sleep
Bowen Centre. Austin Health
PO Box 5555
Heidelberg. 3084 Vic

Country

Australia

Phone

+61 3 9496 3871

Fax

david.berlowitz@austin.org.au

No information has been provided regarding IPD availability

What supporting documents are/will be available?

No Supporting Document Provided

Results publications and other study-related documents

Documents added manually

No documents have been uploaded by study researchers.

Documents added automatically

Source	Title	Year of Publication	DOI
Embase	A randomised controlled trial of CPAP versus non-invasive ventilation for initial treatment of obesity hypoventilation syndrome.	2017	https://dx.doi.org/10.1136/thoraxjnl-2016-208559

N.B. These documents automatically identified may not have been verified by the study sponsor.

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Documents added manually

Documents added automatically