Clinical trial NCT00915161: Sustained Effects of Thoracocentesis in Mechanically Ventilated Patients
Official title: Sustained Effects of Thoracocentesis in Mechanically Ventilated Patients: an Observational Single Centre Cohort Study
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Pleural Effusion
Keywords: ventilation
oxygenation
Lead sponsor: Oxford University Hospitals NHS Trust
Sponsor class: OTHER
First posted: 2009-06-05
Enrollment: 10
Sex: ALL
Minimum age (years): 18
Maximum age (years): 90
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Patients on Mechanical ventilation with evidence of pleural effusion on CXR confirmed with bedside ultrasound

Brief summary: Collections of fluid around the lung (pleural effusions) are common in patients on mechanical ventilation. Long stays on mechanical ventilation can lead to serious complications such as pneumonia and are associated with significant morbidity and mortality. The drainage of pleural effusions may lead to improvements in oxygenation making it easier to discontinue mechanical ventilation.

The purpose of this study was to examine the effects of thoracocentesis (pleural fluid drainage) on blood oxygenation over a 48 hour period to see whether the effects are sustained and therefore helpful in this discontinuation.

Detailed description: This will be a collection of data in patients in whom it has been decided by the attending clinician that pleural drainage would be beneficial. Ultrasound will be used to confirm the presence of pleural effusion and to estimate the size of the pleural effusions and to confirm the position of the pleural drain. Data will be collected before drainage, 30 minutes after drainage and then at 4,8,12 and 24 hours after the insertion of the drain (please see also attached summary of investigations). Measurements will include arterial blood gas analysis drawn from an indwelling arterial catheter, blood pressure, pulse, respiratory rate, mixed, expired CO2 and ventilator settings. The measurements will stop either at the end of the 48 hour period or when the team caring for the patient chose to remove the drain (whichever is the first).

All measurements including the arterial blood gas analysis form part of the standard care of an ICU patient. The arterial blood gas measurements are withdrawn from an indwelling arterial catheter which is routinely in place on all ICU patients. Only the use of thoracic ultrasound by a trained ultrasonographer both before and after the procedure will be additional to the standard care of the patient. The use of Chest X-rays is at the discretion of the treating clinician and does not form part of the study protocol. Standard biochemical, microbiological and cytological tests will be performed on the pleural fluid and blood in keeping with the standard practice for pleural effusions.

The primary outcome measure is the effects of drainage on the P:F ratio. measures of dead space ventilation, A-a gradiants, ventilator settings and dynamic compliance will also be assessed

Eligibility criteria: Inclusion Criteria:

* Patients on mechanical ventilation with evidence of pleural effusions on plain CXR confirmed to be large on bedside ultrasound in whom the attending clinician felt drainage would be beneficial

Exclusion Criteria:

* Coagulopathy

Primary outcomes:
measure: The ratio of Partial pressure of oxygen to inspired concentration of oxygen (P:F ratio)
timeFrame: pre-procedure, 30 minutes, 4,8,24 and 48 hours post procedure
Secondary outcomes:
measure: Effects on A-a gradients, dead space ventilation, ventilator settings and dynamic compliance
timeFrame: pre-procedure, 30minutes, 4,8,24 and 48 hours post procedure
Other outcomes:
Locations:
city: Oxford
country: United Kingdom
facility: John Radcliffe hospital
state: Oxon
Study officials:
affiliation: Oxford University Hospitals NHS Trust
name: andrew p walden, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Walden AP, Garrard CS, Salmon J. Sustained effects of thoracocentesis on oxygenation in mechanically ventilated patients. Respirology. 2010 Aug;15(6):986-92. doi: 10.1111/j.1440-1843.2010.01810.x. Epub 2010 Jul 20.