Automated oxygen control kept saturations on target far more often

Design

Systematic review and meta-analysis of randomised trials

Population

635 hospitalised adults on non-invasive oxygen in 7 trials

Primary outcome

Proportion of time within the target SpO2 range

Effect

Mean difference 21.2 percentage points (95% CI 18.5–23.8) favouring closed-loop control

This meta-analysis pooled seven randomised trials with 635 hospitalised adults receiving non-invasive oxygen, comparing automated closed-loop oxygen control with manual adjustment by staff.

Closed-loop systems kept patients within their target saturation range 81% to 95% of the time, against 51% to 84% with manual control: a mean difference of 21.2 percentage points (95% CI 18.5–23.8). The advantage was larger with low-flow oxygen (31 points) than with high-flow nasal oxygen (13 points), which explained most of the heterogeneity.

Both too little and too much oxygen cause harm, and manual titration is hard to sustain on busy wards. The trials measured time on target, not clinical outcomes, and these devices are not widely available in Indian hospitals.

• Set and document a target saturation range for every patient on oxygen.
• Expect manual titration to leave patients outside target much of the time.
• Where closed-loop devices are available, consider them for patients on low-flow oxygen.
• Avoid hyperoxia as carefully as hypoxaemia, especially in COPD.

Why it matters

Oxygen is a drug that is rarely dosed accurately on the ward.

Don't overread it

The trials measured time in range, not mortality or length of stay.

The statistics, in plain English

A 21-point difference means patients spent about a fifth more of their time within the target range. High heterogeneity (I² 88%) reflected different oxygen delivery methods; once split by method, results were consistent.

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