Closing a step-down unit pushed more patients into the ICU

Design

Retrospective before-after study with interrupted time-series analysis

Population

ICU admissions at one hospital before and after intermediate care unit closure

Primary outcome

ICU utilisation and characteristics of ICU admissions

Effect

ICU admissions 14.2% → 20.5% of hospital admissions (P<0.001); no rise in readmissions or mortality

A before-after study at one US hospital looked at what happened when its intermediate care unit was closed. ICU admissions rose from 14.2% to 20.5% of hospital admissions, monthly ICU admissions by 42%, and ICU and hospital days by about 30%. Admissions from the emergency department and the ward to ICU both increased, and low-risk 'monitoring only' ICU admissions rose from 23% to 33%.

ICU readmissions and the time from emergency department to ICU did not worsen. Mortality among ICU patients appeared lower after adjustment, but an interrupted time-series analysis found no change against the underlying trend.

For physicians, the lesson is that the patients do not disappear when a unit closes; they move to the next level up, and the ICU fills with patients who mainly need closer monitoring.

• Removing intermediate care shifted monitoring-only patients into the ICU.
• Expect higher ICU demand if a step-down or high-dependency unit is closed or downgraded.
• Clear criteria for ward-level enhanced monitoring can limit unnecessary ICU use.
• Mortality did not worsen, but outcomes for patients who would previously have gone to step-down were not studied.

Why it matters

Step-down beds are often cut to save money, and this shows where the cost reappears.

Don't overread it

The lower mortality was not confirmed against the secular trend, so it is not evidence that closing the unit helped.

The statistics, in plain English

The propensity-adjusted odds ratio of 0.82 suggested lower ICU mortality, but the time-series analysis, which accounts for mortality already falling over time, found no effect — so the apparent benefit probably reflects the trend, not the closure.

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