Atelectasis and mechanical ventilation mode during conservative oxygen therapy: A before-and-after study

Area of Science:

• Critical Care Medicine
• Pulmonary Medicine
• Radiology

Background:

• Mechanical ventilation is crucial for critically ill patients but can lead to complications like atelectasis.
• Optimizing oxygen therapy is essential for patient outcomes in intensive care units (ICUs).

Purpose of the Study:

• To evaluate the impact of conservative oxygen therapy (COT) targeting SpO2 of 90%-92% on radiological atelectasis.
• To assess the effect of COT on mechanical ventilation parameters, including weaning and spontaneous ventilation trials.

Main Methods:

• Secondary analysis of 105 ICU patients from a pilot before-and-after study.
• Radiologists assessed atelectasis scores (AS) on 555 chest radiographs, blinded to treatment allocation.
• Primary outcomes included changes in AS and time to weaning from mandatory ventilation and first spontaneous ventilation trial (SVT).

Main Results:

• COT was associated with significantly lower time-weighted average and best atelectasis scores.
• Patients receiving COT showed greater improvement in AS within the first 7 days.
• COT significantly reduced time to successful weaning from mechanical ventilation and shortened the time to the first SVT.

Conclusions:

• Conservative oxygen therapy may decrease radiological evidence of atelectasis in mechanically ventilated ICU patients.
• COT appears to facilitate earlier weaning from mandatory ventilation modes.
• The study suggests COT may lead to an earlier first trial of spontaneous ventilation.