Oral care documentation nearly doubled and hospital-acquired pneumonia did not move

Design

retrospective observational evaluation of a quality improvement programme over 60 months

Population

33,155 hospitalised older adults at one US hospital, January 2021 to December 2025

Primary outcome

oral care documentation rates and incidence of non-ventilator hospital-acquired pneumonia

Effect

documentation rose from about 30% to about 57% across age groups; pneumonia 2.1% pre-implementation, 2.3% pilot, 2.4% post-implementation

The evidence that oral care reduces non-ventilator hospital-acquired pneumonia is strong enough that the intervention is often described as proven, with reported reductions of 40% to 60%. This nurse-led programme at an American hospital set out to deliver it: evidence-based oral care protocols for hospitalised older adults, launched in July 2022, with staff education and patient engagement, evaluated retrospectively across 33,155 hospitalised older adults over 60 months from January 2021 to December 2025.

The process measure moved substantially. Documentation of oral care roughly doubled in every age group - from 30% to 57% in those aged 65-74, 31% to 58% in those 75-84, and 30% to 56% in those 85 and over, with the same pattern in both sexes. The outcome did not. Non-ventilator hospital-acquired pneumonia was 2.1% before implementation, 2.3% during the pilot and 2.4% afterwards.

The authors frame this positively, and the negative result deserves to be read straight instead. Two explanations compete and the study cannot separate them. Documentation may have improved without the care itself improving - recording a task and performing it are different, and a programme that measures documentation will reliably improve documentation. Or the care improved and 57% adherence is simply not enough to shift a 2% event rate. Either way, the practical lesson is the one that generalises: if you run an oral care programme, audit whether mouths are actually clean, not whether boxes are ticked, and set the outcome measure before you start.

• Audit oral care by inspecting mouths, not by counting documentation entries
• Set the pneumonia rate as the outcome measure before launching a programme, and report it whichever way it goes
• Aim for adherence well above 57% - half-delivered oral care may be no better than none
• Keep doing oral care: the trial evidence behind it is stronger than this single before-and-after evaluation
• Treat any quality improvement report whose process measure improved and outcome did not as an unanswered question, not a success

Why it matters

It is a working example of a quality improvement programme moving the thing it measured and not the thing it was for.

Don't overread it

A single-centre retrospective before-and-after evaluation - it does not overturn the trial evidence that oral care reduces hospital-acquired pneumonia.

The statistics, in plain English

With 33,155 patients and a baseline event rate of 2.1%, this study had ample power to detect the 40% to 60% reduction the intervention is credited with - so the flat result is informative rather than merely negative. A retrospective before-and-after design cannot exclude secular changes running the other way, such as an increasingly comorbid inpatient population over five years, which could mask a real benefit. But the simplest reading is that the documentation improved more than the care did.

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