Table 2 Summary of primary and secondary outcome measures

Day 0

Change in end expiratory lung impedance (∆EELI)

6 h

Primary outcome

Day 0

Change in end expiratory lung impedance (∆EELI)

15 min, 60 min, and 3 h

Secondary outcomes

Change in Tidal impedance variation (∆VARt)

0, 60 min, 3 h, and 6 h

Change in oxygenation (PaO₂/FiO₂)

Change in arterial CO₂ (PaCO₂)

Change in respiratory rate

Change in modified Borg dyspnoea score

Requirement for escalation of O₂ therapy

Discharge

Length of ICU stay

Day 2–3

Re-admission to ICU

Length of hospital stay

Diagnosis of a respiratory complication

Follow up

Hospital re-admission

Week 6

Diagnosis of a respiratory complication