Routine ventilator disconnection on critically ill patients - how bad is it? A clinical observational study in the intensive care unit at Uppsala University Hospital

ISRCTN ISRCTN76631800
DOI https://doi.org/10.1186/ISRCTN76631800
Secondary identifying numbers N/A
Submission date
15/03/2012
Registration date
29/03/2012
Last edited
12/08/2015
Recruitment status
No longer recruiting
Overall study status
Completed
Condition category
Respiratory
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data

Plain English summary of protocol

Background and aims
Lung collapse occurs when the positive pressure drops in mechanically ventilated patients with acute respiratory failure. The aim in this study is to investigate whether a short, routine disconnection to change the bacterial filter in a mechanical ventilator circle would affect lung function.

Who can participate?
Critically ill and mechanical ventilated patients who are admitted to an intensive care unit and are above 18 years of age.

What does the study involve?
All participants will receive the same treatment. Before a routine filter change, blood pressure and pulse rate will be registered and a blood sample will be drawn. One hour and fifteen minutes after the filter change the same measurements will be repeated.

What are the possible benefits and risks of participating?
Since this study examines the effect of a routine procedure, no risk (more than in the normal routine care) exists. There are no direct benefits, but participation in the study could lead to gained knowledge in the field of respiratory care. It is also possible that the gained knowledge could help future intensive care patients.

Where is the study run from?
Uppsala Academic Hospital, Sweden

When is the study starting and how long is it expected to run for?
The study will be open to participants from approximately February 2011 until January 2013.

Who is funding the study?
Local hospital grants

Who is the main contact?
Mr Joakim Engström
joakim.engstorm@akademiska.se

Contact information

Prof Anders Larsson
Scientific

Department of Anesthesiology and Intensive Care Medicine
Uppsala University
Akademiska sjukhuset
ANIVA Ing70, 1 tr
Uppsala
75185
Sweden

Study information

Study designSingle-centre prospective observational study with consecutive inclusion
Primary study designObservational
Secondary study designCross sectional study
Study setting(s)Hospital
Study typeTreatment
Participant information sheet http://www.physix.se:1080/forskning/disc_studyinfo.pdf [Swedish]
Scientific titleRoutinely ventilator disconnection on critically ill patients - effect on oxygenation and lung function. A clinical observational study in the intensive care unit at Uppsala University Hospital
Study objectivesEven a short disconnection from a ventilator during a daily change of a High-Efficiency Particulate Air (HEPA) filter may cause deterioration of lung function in critically ill patients.

Aim:
To test this hypothesis with the primary end-point of lung function expressed by oxygenation and compliance in a clinical prospective observational study in an intensive care unit (ICU) at Uppsala University Hospital.
Ethics approval(s)Regional Ethical Review Board in Uppsala [Regionala etikprövningsnämnden i Uppsala], 09/12/2010, ref: 2010/317
Health condition(s) or problem(s) studiedCritically ill patients with an acute respiratory failure treated with mechanically ventilation.
InterventionTwenty patients admitted to the intensive care unit will be consecutively enrolled in this clinical prospective observational study. The study is approved by the Regional Ethical Review Board in Uppsala, Sweden. Informed consent will be obtained from the next in kin before measurements is made.
Before the routinely filter change tidal volume [Vt], respiratory rate, end-inspiratory plateau pressure [EIP] and PEEP (Positive End Expiratory Pressure, will be registered. Compliance of the respiratory system (Crs) will be calculated as VT/(EIP-PEEP). Both EIP and PEEP is measured after a prolonged pause of 10 seconds. A decrease of Crs could suggest that lung collapse has occurred. The fraction of inspired oxygen [FiO2], blood pressure and pulse rate will be registered and an arterial blood gas sample for determination of PaO2, PaCO2, pH and BE will be drawn from the patient. A decrease in PaO2 could also suggest that lung collapse has occurred. Fifteen minutes and one hours after the filter change the same measurements will be repeated.
Intervention typeOther
Primary outcome measureThe difference in PaO2 (kPa) between baseline, 15 minutes and 60 minutes after the HEPA filter change.
Secondary outcome measuresThe difference in pulmonary compliance between baseline, 15 minutes and 60 minutes after the HEPA filter change.
Overall study start date14/02/2011
Completion date01/01/2013

Eligibility

Participant type(s)Patient
Age groupAdult
SexBoth
Target number of participantsThe aim is to include 20 patients
Key inclusion criteria1. Patients with respiratory failure treated in the ICU with controlled mechanical ventilatory support
2. Need for fraction of inspired oxygen ≥ 0.5 and positive end expiratory pressure ≥ 10 cmH2O
Key exclusion criteria1. Patients with spontaneous mechanical ventilatory treatment, patients without an arterial access, 2. Patients without an informed consent from next of kin
3. Pregnant patients
4. Patients under the age of 18
5. Patients that do not meet the inclusion criteria
Date of first enrolment14/02/2011
Date of final enrolment01/01/2013

Locations

Countries of recruitment

  • Sweden

Study participating centre

Uppsala University
Uppsala
75185
Sweden

Sponsor information

Uppsala University Hospital (Sweden)
Hospital/treatment centre

Akademiska sjukhuset
Uppsala
75185
Sweden

Website http://www.uas.se/
ROR logo "ROR" https://ror.org/01apvbh93

Funders

Funder type

Hospital/treatment centre

Uppsala University Hospital - Akademiska Sjukhuset (Sweden)

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 01/08/2014 Yes No