Non Invasive ventilation (NIV) in chronic ventilatory failure: A comparison of different modes of ventilation and an analysis of mechanisms of action

ISRCTN ISRCTN33655313
DOI https://doi.org/10.1186/ISRCTN33655313
Secondary identifying numbers RRCC820F 444354
Submission date
23/01/2004
Registration date
23/01/2004
Last edited
03/12/2008
Recruitment status
No longer recruiting
Overall study status
Completed
Condition category
Nervous System Diseases
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data

Plain English summary of protocol

Not provided at time of registration

Contact information

Dr Justine Tuggey
Scientific

24 West End Road
Calverley Pudsey
Leeds
LS28 5PF
United Kingdom

Phone +44 (0)1943 604785

Study information

Study designRandomised controlled trial
Primary study designInterventional
Secondary study designRandomised controlled trial
Study setting(s)Not specified
Study typeNot Specified
Scientific title
Study objectivesNIV is an effective treatment for patients with ventilatory failure due to chest wall deformity, neuromuscular disease and some patients with lung disease. NIV during sleep improves oxygenation and transcutaneous CO2 overnight, together with an improvement in sleep quality and daytime arterial blood gas tensions. It has been postulated that either control of nocturnal hypoventilation with resetting of central drive, or the relief of chronic respiratory muscle fatigue is the crucial factor determining success. Some studies have shown that the improvement in daytime arterial blood gas tensions relates to a resetting of the central respiratory controller, but not to changes in respiratory muscle function. However Schoenhofer showed that NIV used for 8 hours per day during wakefulness was just as effective at improving arterial blood gas tensions as 8 hours per day during sleep. There was a significant improvement in respiratory muscle strength, without any change in central respiratory drive, and they postulated that NIV "works" by improving respiratory muscle function.
This distinction is important since the mechanism by which NIV "works" should determine the treatment endpoint, i.e. abolition of respiratory muscle activity to achieve complete muscle rest or improved sleep efficiency and optimisation of blood gas tensions overnight to restore central respiratory drive and improve sleep quality, with consequent beneficial effects upon daytime function. In turn this may affect the choice of ventilator that is to be used; for instance pressure support ventilation (PSV), in which the ventilator is triggered into inspiration and expiration according to patient effort, results in less complete muscle rest but may be more comfortable than full pressure controlled ventilation (PCV), during which the patient is required to make no respiratory effort. However, the cost of achieving complete muscle rest may be higher inflation pressures and an imposed pattern of breathing, which patients may find uncomfortable, and that compromises sleep quality.
We plan a comparison of pressure support ventilation against volume cycled ventilation in a one month randomised crossover trial to identify the relative importance of respiratory muscle fatigue and central respiratory drive in chronic respiratory failure. This will help to identify treatment endpoints in establishing patients on home non-invasive ventilation.
Ethics approval(s)Not provided at time of registration
Health condition(s) or problem(s) studiedNervous system diseases: Other nervous system disease
InterventionPressure support ventilation vs volume cycled ventilation
Intervention typeOther
Primary outcome measureArterial blood gas tensions (pO2, PCO2)
Secondary outcome measures1. Exercise tolerance (shuttle walk tests)
2. Psychometric tests
3. Central respiratory drive (using ventilatory and PO.1 response to carbon dioxide)
4. Assessment of respiratory muscle strength (sniff nasal pressures).
5. Full polysomnography (sleep quality and efficiency)
6. Health status
Overall study start date10/01/2000
Completion date10/01/2002

Eligibility

Participant type(s)Patient
Age groupNot Specified
SexNot Specified
Target number of participantsAdded December 2008: 13
Key inclusion criteriaPatients with established chronic respiratory failure due to chest wall deformity or neuromuscular weakness stable of home nocturnal non-invasive ventilation.
Key exclusion criteriaNot provided at time of registration
Date of first enrolment10/01/2000
Date of final enrolment10/01/2002

Locations

Countries of recruitment

  • England
  • United Kingdom

Study participating centre

24 West End Road
Leeds
LS28 5PF
United Kingdom

Sponsor information

NHS R&D Regional Programme Register - Department of Health (UK)
Government

The Department of Health
Richmond House
79 Whitehall
London
SW1A 2NL
United Kingdom

Phone +44 (0)20 7307 2622
Email dhmail@doh.gsi.org.uk
Website http://www.doh.gov.uk

Funders

Funder type

Government

NHS Executive Northern and Yorkshire (UK)

No information available

Results and Publications

Intention to publish date
Individual participant data (IPD) Intention to shareNo
IPD sharing plan summaryNot provided at time of registration
Publication and dissemination planNot provided at time of registration
IPD sharing plan

Study outputs

Output type Details Date created Date added Peer reviewed? Patient-facing?
Results article results 01/10/2005 Yes No