- Design
- Stepped-wedge cluster-randomised trial, nine wards in three hospitals
- Population
- 8,870 adult inpatients staying at least 48 hours
- Primary outcome
- Non-ventilator hospital-acquired pneumonia
- Effect
- 1.0% vs 0.7%; cumulative HR 0.40 (0.19–0.82)
HAPPEN, published in June, was a stepped-wedge cluster-randomised trial across nine wards in three Australian hospitals. Wards crossed from usual oral care to an enhanced bundle: products at the bedside, patient and staff education, and audit with feedback, supported by dedicated research nurses. Outcome assessors were masked.
Among 8,870 adults staying 48 hours or more, non-ventilator hospital-acquired pneumonia occurred in 1.0% under usual care and 0.7% under the intervention. The cumulative hazard ratio was 0.40 (95% CI 0.19–0.82), from about 1.00 to 0.41 infections per 100 admission-days at risk. Completion of the oral care protocol rose from 16% to 62%. Other respiratory and oral infections did not differ.
This is one of the few randomised tests of a simple measure against a common hospital infection. The bundle depended on dedicated nurses, so the challenge is sustaining it without them, but the intervention itself is cheap and safe.
- Consider an oral care bundle for medical and surgical wards: bedside products, staff education and audit.
- Measure completion of oral care, since adherence rose from 16% to 62% in the trial.
- Target assistance at patients who cannot manage their own oral hygiene.
- Count non-ventilator hospital pneumonia as a quality indicator rather than an unavoidable event.
Why it matters
Non-ventilator hospital pneumonia is one of the commonest hospital infections and has rarely had a tested remedy.
Don't overread it
With 78 events and dedicated research nurses, the effect size may shrink when wards deliver the bundle on their own.
The statistics, in plain English
A hazard ratio of 0.40 means about 60% fewer infections per day at risk. The interval is wide, 0.19–0.82, because there were only 78 cases, so the true effect could be considerably smaller.
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