Comparison of Pressure Support and Pressure Control Ventilation in Chronic Respiratory Failure

Phase 4

• Conditions: COPD; Chest Wall Disease; Neuromuscular Disease; Obesity Hypoventilation
• Interventions: Other: Pressure support ventilation; Other: Pressure control ventilation

• Registration Number: NCT00994552
• Lead Sponsor: Guy's and St Thomas' NHS Foundation Trust

Brief Summary

This study is looking at whether there is a difference in outcomes using two different types of breathing support in those patients who have chronic respiratory failure (patients who under-breathe).

There is little data to demonstrate which mode of ventilation is better in terms of physiological outcomes and outcome data relating to patient symptoms.

We hypothesize that one type of breathing support: pressure support ventilation would be more comfortable for patients as it more closely matches a patient's own respiratory pattern and and so leads to improved adherence and consequent improvement in quality of life.

Patients with respiratory failure will be randomly assigned to receive either pressure support ventilation or pressure control ventilation for the first 6 weeks and then cross-over to receive the mode not previously used for a further 6 weeks. They will have baseline data recorded and then be followed up after each 6 week block.

Detailed Description

Not available

Study Timeline

• Study Start: 2009-08
• Status Verified: 2009-10
• Study First Submitted: 2009-10-13
• Study First Submitted QC: 2009-10-13
• Last Update Submitted: 2009-10-13
• Study First Posted: 2009-10-14
• Last Update Posted: 2009-10-14
• Primary Completion: 2010-04

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 20

Inclusion Criteria

• Patients with chest wall deformity, neuromuscular disease or obesity hypoventilation syndrome with an FEV1/FVC ratio of >70% and VC <50% predicted or patients with COPD with a FEV1/FVC ratio of <70% an FEV1 <50% predicted

• Stable

  • pH >7.35
  • ESS <18
  • Symptomatically stable with clinical resolution of intercurrent infection: normal C reactive protein, white cell count and afebrile

• Daytime symptoms compatible with nocturnal hypoventilation i.e. poor sleep, morning headache, daytime somnolence, shortness of breath

• Arterial carbon dioxide partial pressure (PaCO2) > 6.0kPa during day with evidence of nocturnal hypoventilation (TcCO2 >7.5KPa or a rise in TcCO2 of >1 KPa)

• No prior domiciliary ventilation use

• Patients with COPD must be established on optimal medical treatment prior to enrolment

Exclusion Criteria

• Psychological, social or geographical situation that would impair compliance with the schedule
• Patients who have underlying malignancy or severe cardiac dysfunction (ejection fraction <40%)
• Complex OSA

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Pressure support ventilation	Pressure support ventilation	Pressure support ventilation
Pressure control ventilation	Pressure control ventilation	Pressure control ventilation

Primary Outcome Measures

Name	Time	Method
Adherence to ventilation	6 and 12 weeks

Secondary Outcome Measures

Name	Time	Method
Sleep fragmentation as assessed by actigraphy	2 week perids from 4 and 10 weeks
Patient ventilator synchrony as measured by number of ineffective efforts	6 and 12 weeks
Spirometry: forced expiratory volume in 1s and forced vital capacity	6 and 12 weeks
Respiratory muscle strength: maximum inspiratory pressure, maximum expiratory pressure and sniff nasal pressure	6 and 12 weeks
Arterial blood gases	6 and 12 weeks
Health related quality of life as measured by CRQ and SRI	6 and 12 weeks
Breathlessness (MRC dyspnoea score)	6 and 12 weeks
Assessment of daytime vigilance and fatigue by the Epworth sleepiness score,Oxford sleep resistance test and the fatigue severity score.	6 and 12 weeks
Sleep comfort as assessed by a visual analogue scale	6 and 12 weeks

Trial Locations

Locations (1)

Guy's and St Thomas' NHS Foundation Trust; 🇬🇧 London, United Kingdom