Chronic Obstructive Pulmonary Disease Clinical Trial
Official title:
A Pilot Randomised Controlled Trial of Withdrawal of Non-invasive Ventilation in COPD Patients With Acute Hypercapnic Respiratory Failure
The investigators design a pilot randomised, single-centred, controlled trial to compare different withdrawal methods of Non-invasive ventilation. Our study aims at comparing stepwise withdrawal of Non-invasive ventilation versus immediate withdrawal of Non-invasive ventilation. The primary endpoint is to compare the rate of success between two withdrawal methods. The investigators define success as no recurrence of acute hypercapnic respiratory failure or restitution of Non-invasive ventilation within 48 hours after NIV is stopped. The secondary endpoints include time to recurrence of acute hypercapnic respiratory failure measured from the time of randomisation, the total days of Non-invasive ventilation use and the days of hospitalisation. Results from this trial will inform design of future randomised trial in this area.
All patients would receive standard medical treatment with inhaled bronchodilator, systemic
steroid, antibiotics according to our local bacteriology. Acute NIV was initiated by trained
respiratory nurses according to standardised protocols. The nurses would be at the bedside
during the initial acclimatization. BIPAP vision was used to provide bi-level pressure
support ventilation. Interfacing with different types of nasal or full-mask would be
individualised. NIV was used for as many as possible in the first day, at least 20 hrs.
Throughout the NIV treatment, the following parameters will be monitored when NIV is
started: arterial blood gases, respiratory rate, heart rate and blood pressure, mental
state, pulse oximetry. If a patient failed to respond to NIV, he or she would be intubated
if appropriate. Criteria for failure include lack of clinical improvement with increasing
dyspnea and deterioration of blood gases, hemodynamic instability, uncontrolled ventricular
arrythmia, development of hypercapnic coma and cardiopulmonary arrest.
A patient would be considered suitable to withdraw from the ventilator if he or she fulfil
the criteria at rest.
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Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment
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