An enhanced oral-care bundle was associated with fewer non-ventilator hospital-acquired pneumonias

Design

Stepped-wedge, cluster-randomised trial, nine wards in three Australian hospitals

Population

8,870 hospitalised adults who stayed at least 48 hours

Primary outcome

Non-ventilator hospital-acquired pneumonia incidence

Effect

1.0% vs 0.7%; cumulative hazard ratio 0.40 (95% CI 0.19 to 0.82)

HAPPEN was an open-cohort, stepped-wedge, cluster-randomised trial in nine wards at three Australian hospitals, published in June. Wards moved from usual care to an enhanced oral-care intervention in sequence. It had three parts: better delivery of oral care with products supplied, education for patients and staff, and audit with feedback delivered by dedicated research nurses. Data collectors were masked.

Of 8,870 patients who stayed at least 48 hours, non-ventilator hospital-acquired pneumonia occurred in 46 of 4,523 (1.0%) under usual care and 32 of 4,347 (0.7%) with the intervention, a cumulative hazard ratio of 0.40 (95% CI 0.19 to 0.82), or a fall from 1.00 to 0.41 infections per 100 admission-days at risk. Completion of the oral-care protocol rose from 15.9% to 61.9%. Effects on other respiratory and oral infections were not clear.

The event numbers were small, the research nurses are a resource most wards lack, and the trial was in Australia. It does show that routine mouth care, done consistently and audited, can matter. It does not tell you which of the three components did the work.

• Make routine mouth care a documented, ward-level task, not an optional extra.
• Audit whether oral care is actually done; protocol completion was only 15.9% under usual care.
• Include nurses and carers in education on why mouth care matters for pneumonia.
• Expect modest absolute risk reduction in a general ward population (1.0% to 0.7%).

Why it matters

Non-ventilator pneumonia is rarely targeted by infection-prevention programmes, and this is randomised evidence for a ward-level measure.

Don't overread it

The effect comes from a bundle with dedicated nursing support, so it cannot be assigned to any single component.

The statistics, in plain English

A cumulative hazard ratio of 0.40 sounds large because the baseline risk was low; in absolute terms pneumonia fell from 1.0% to 0.7% of patients. The interval (0.19 to 0.82) is wide because there were only 78 events in total.

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