Extubation With or Without Spontaneous Breathing Trial (SBT)

October 14, 2009 updated by: Beijing Shijitan Hospital, Capital Medical University
Spontaneous breathing trial (SBT) has long been thought to be a essential process before extubation. In this study,the investigator hypothesized that SBT could be not essential during weaning from ventilator and investigated whether weaning could be better done without a spontaneous breathing trial in non-COPD（COPD, Chronic Obstructive Pulmonary Disease） critically ill patients. This study has revealed, for the first time, that compared with use of SBT in discontinuing ventilator process, patients underwent successful extubation without SBT. For this subset of patients the findings suggest that SBT may be excluded preceding extubation in a general intensive care population.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

In this 1000-bed primary teaching hospital, the study was conducted in the 8-bed adult general ICU over the course of 13 months. All patients enrolled in this study were mechanically ventilated for more than 48 hrs via endotracheal tubes during the study period. The investigation was approved by the hospital ethics committee, and informed written consent was obtained from the next of kin of every patient. Patients were ventilated in pressure support (PS) during the entire weaning period. The levels of inspiratory PS and positive end-expiratory pressure （PEEP) were progressively reduced depending on the patient's clinical assessment and blood gas values. Patients enrolled in this study had to meet all of the following readiness criteria: show significant improvement or resolution of the underlying cause of acute respiratory failure; be fully awake; require bronchial toilet less than twice in the 4 hours proceeding the assessment; stable hemodynamics without further need of vasoactive agents; arterial oxygen tension (PaO2)/fraction of inspired oxygen (FiO2) ratio >200 at a PEEP of 4.0 cm H2O with a maximal FiO2 of 0.40; core temperature <38.0℃; systolic blood pressure >90 mmHg; respiratory rate to tidal volume ratio (RVR) <105 breaths/min/L. The RVR was calculated after 1 min of spontaneous breathing.The maximal inspiratory PS of 12 cm H2O and no mandatory machine breaths supplied from the ventilator.

Study protocol The investigators investigated the weaning process with and without SBT. All patients were continuously assessed according to the readiness criteria and were screened for enrollment once a day. As soon as the patient was ready for weaning, he or she was randomly assigned to SBT or no-SBT study groups. Randomization was carried out in a blinded fashion using opaque and sealed envelopes. All patients in the study breathed through the ventilator circuit with flow-triggering (2L/min) and pressure support ventilation mode. In the SBT group, the patients underwent a 1 hr SBT with inspiratory PS of 7 cmH2O with other settings remaining constant (FiO2, PEEP, trigger sensitivity). For patients showing poor tolerance to the SBT, full ventilation support was immediately recommenced. This was defined by the following failure criteria: a decrease in oxygen saturation to <90%; respiratory rate >35/min for more than 5 min, in the presence of diaphoresis or thoraco-abdominal paradox; sustained increase in heart rate (>140/min), or significant change in systolic blood pressure (>180 or <90 mmHg). The patients who tolerated the SBT underwent immediate extubation and received (breathed in) supplemental oxygen via a facemask. In no-SBT group, as soon as a patient met readiness criteria, he or she underwent extubation without SBT process and received supplemental oxygen via a facemask. Following extubation, noninvasive ventilatory support was introduced in the following circumstances: hypoxemia (SaO2<90% for >15mins) under receiving supplemental oxygen; presence of respiratory acidosis (arterial PH<7.35 with arterial carbon dioxide tension (PaCO2)>45mmHg; and respiratory rate >25 breaths/min for 1 hr. The mode of ventilation was Bi-level Positive Airway Pressure (BiPAP). When such support was deemed inadequate (hypoxemia, hypercapnea, or respiratory distress), the patient was reintubated and mechanically ventilated.

The SBT and extubation were performed by two doctors who are members of the research team. Decisions regarding reintubation were made by doctors who were blinded for the treatment group. Extubation failure is defined as reintubation within 48 hrs. The reasons for reintubation were prospectively recorded.

Statistical Analysis Results are expressed as mean ± SD. Mean values of selected demographic variables and physiologic parameters of patients who underwent SBT were compared by student's t tests to those who underwent extubation directly. The differences in proportions between the two groups were determined using chi square test (X2-test).

Study Type

Interventional

Enrollment (Actual)

67

Phase

  • Not Applicable

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

16 years to 93 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Mechanically Ventilated patient

Exclusion Criteria:

  • Chronic Obstructive Pulmonary Disease

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: SBT group
In the SBT group, the patients underwent a 1 hr SBT with inspiratory PS of 7 cmH2O with other settings remaining constant (FiO2, PEEP, trigger sensitivity). The patients who tolerated the SBT underwent immediate extubation.
Behavioral: spontaneous breathing trial
No Intervention: no-SBT group
In no-SBT group, as soon as a patient met readiness criteria, he or she underwent extubation without SBT process.
Behavioral: spontaneous breathing trial

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Number of Participants With Successful Extubation, Reintubation and in Hospital Mortality
Time Frame: 13 months
13 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Beijing Shijitan Hospital, Capital Medical University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

June 1, 2006

Primary Completion (Actual)

July 1, 2007

Study Completion (Actual)

October 1, 2007

Study Registration Dates

First Submitted

March 21, 2009

First Submitted That Met QC Criteria

October 14, 2009

First Posted (Estimate)

November 26, 2009

Study Record Updates

Last Update Posted (Estimate)

November 26, 2009

Last Update Submitted That Met QC Criteria

October 14, 2009

Last Verified

October 1, 2009

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • Beijing Shijitan Hospital

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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