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Non Invasive Ventilation in Abdominal Postoperative Period (NIVAS)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01971892
Recruitment Status : Unknown
Verified December 2014 by University Hospital, Montpellier.
Recruitment status was:  Active, not recruiting
First Posted : October 29, 2013
Last Update Posted : December 3, 2014
Information provided by (Responsible Party):
University Hospital, Montpellier

Brief Summary:
Acute respiratory failure may occur early in the postoperative course, requiring endotracheal intubation and mechanical ventilation in selected patients, thus increasing morbidity and mortality and prolonging intensive care unit (ICU) and hospital stay.We will perform a multicenter, prospective, randomized clinical trial to compare the efficacy of non invasive ventilation (NIV) which associated pressure support ventilation (PSV: 5 to 15 cmH2O) and positive end expiratory pressure (PEEP: 5 to 10 cmH2O) with standard oxygen therapy in the treatment of postoperative acute respiratory failure. We also set out to examine the hypothesis that early application of NIV may prevent intubation and mechanical ventilation in patients who develop acute respiratory failure after abdominal surgery.

Condition or disease Intervention/treatment Phase
Surgery Trauma to the Abdomen Acute Respiratory Failure Other: Non Invasive ventilation (facial mask and NIV ventilator) Other: Standard oxygen therapy with facial mask Not Applicable

Detailed Description:
The Non-Invasive Ventilation After Surgery (NIVAS) is an investigator-initiated, multi-center, stratified, two-arm parallel-group trial with a computer-generated allocation sequence and electronic system based randomization. The study protocol and statistical analysis plan were approved for all centers by a central Ethics Committee (France) according to French law.The NIVAS study is conducted in accordance with the declaration of Helsinki and was registered on August 2013.All centers have a long experience with NIV (more than 10 years of NIV use for ARF, and more than 5 years of NIV use for ARF following abdominal surgery). Randomization will stratified by department, age (less or more 60 years), site of surgery (upper or lower abdominal) and according to the presence or absence of postoperative epidural analgesia as this may influence outcomes. Treatment assignments will concealed from patients, research staff, the statistician, and the data monitoring and safety committee.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 300 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Non Invasive Ventilation After Abdominal Surgery in Postoperative Acute Respiratory Failure: a Multicenter Randomized Controlled Trial.
Study Start Date : May 2013
Estimated Primary Completion Date : December 2014
Estimated Study Completion Date : December 2014

Arm Intervention/treatment
Experimental: Non invasive ventilation (NIV)
Experimental arm = non invasive ventilation (NIV) which associated pressure support ventilation (PSV: 5 to 15 cmH2O) and positive end expiratory pressure (PEEP: 5 to 10 cmH2O) NIV will intermittently delivered to the patients for at least six hours (cumulative tme of all trials which lasted at least 30 min) during the first 24h after the initiation of treatment. Between each NIV period, the patient will received supplemental oxygen through facial mask to achieve an oxygen saturation level above 94%.
Other: Non Invasive ventilation (facial mask and NIV ventilator)
Non invasive ventilation (NIV) which associated pressure support ventilation (PSV: 5 to 15 cmH2O) and positive end expiratory pressure (PEEP: 5 to 10 cmH2O). NIW will be delivered through a facial mask with either NIV ventilator or ICU ventilator with NIV option

Active Comparator: standard oxygen therapy with facial mask
Patients assigned to standard medical therapy will received supplemental oxygen via a facial Venturi mask at a rate of up to 15 liters per minute with in order to maintain peripheral oxygen saturation above 94%.
Other: Standard oxygen therapy with facial mask
facial Venturi mask

Primary Outcome Measures :
  1. The primary end point for the comparison between noninvasive ventilation (NIV) and standard oxygen therapy will be the tracheal intubation within 7 days after the initiation of treatment. [ Time Frame: primary end point will be evaluated within 7 days after the initiation of treatment. ]
    Endotracheal intubation.

Secondary Outcome Measures :
  1. Gas exchange after one to two hours after inclusion in the protocol [ Time Frame: one to two hours after inclusion in the protocol ]
    Gas exchange will be obtain from arterial blood gases from an arterial line (radial or femoral). Judgement criteria for gas exchange will be oxygenation evaluated by PaO2/FiO2 ratio and PaCO2.

  2. nosocomial infections within the 14 days and mortality [ Time Frame: At D-14 that means 14 days after initiation of treatment ]
    • Pulmonary infection
    • Urinary infection
    • Catherter related infection
    • Bacteriemia and Mortality

  3. length of ICU [ Time Frame: From inclusion until the study until discharge or at 90 days maximal of ICU ]
    Total ICU stay, i.e, from ICU admission until discharge will be also evaluated at a maximum of 90 days (which is the end of the follow up of the study).

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

Eligibility :

  • age of more than 18 years
  • scheduled for elective or not elective abdominal surgery requiring laparotomy or laparoscopy and general anesthesia.

Inclusion :

  • acute respiratory failure occurring within the seven days of the surgery procedure which is defined as presence and persistence for at least 30 min and at least one of the two followings: 1) a respiratory rate of more than 30 breaths per minute and 2) clinical signs suggestive of respiratory muscle fatigue, increased work of breathing, or both, such as use of respiratory accessory muscles, paradoxical motion of the abdomen, or retraction of intercostal spaces
  • hypoxemia defined by a PaO2 lower than 60 mmHg in ambient air or lower than 80 mmHg under 15 liters O2 or an arterial O2 saturation by pulse-oximetry (SpO2) lower than 90% (PaO2/FiO2< 200 mmHg).

Exclusion Criteria:

  • Emergency procedure surgery (operation that must be performed as soon as possible and no longer than 12 hours after inclusion in the study)
  • previous recruitment into another trial.
  • Cardiopulmonary arrest
  • Glasgow coma scale <8
  • Absence of airway protective gag reflex
  • Upper airway obstruction
  • Pregnancy.
  • Patients who refuse to undergo endotracheal intubation, whatever the initial therapeutic approach
  • Chronic home non invasive ventilation

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01971892

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Department of Anesthesiology & Critical Care, St Eloi University Hospital
Montpellier, France, 34000
Sponsors and Collaborators
University Hospital, Montpellier
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Principal Investigator: Samir Jaber, MD PhD University Hospital, Montpellier
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: University Hospital, Montpellier Identifier: NCT01971892    
Other Study ID Numbers: UF 9015
First Posted: October 29, 2013    Key Record Dates
Last Update Posted: December 3, 2014
Last Verified: December 2014
Keywords provided by University Hospital, Montpellier:
Abdominal surgery;
Postoperative complication;
Acute respiratory failure;
Non-invasive ventilation
Additional relevant MeSH terms:
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Respiratory Insufficiency
Respiratory Distress Syndrome, Adult
Abdominal Injuries
Respiration Disorders
Respiratory Tract Diseases
Lung Diseases
Wounds and Injuries