Abstract
We designed a tool to measure the rate and appropriateness of intensive care unit (ICU) nursing coverage as a proxy for the use of resources. We tested the tool in 32 Italian ICUs during a cross-sectional study (4 days/week, October 2001 and April 2002). The level of care was classified as high or low. The appropriate patient-to-nurse ratio for both levels (2/1 and 3/1 in this ICU mix) was defined. The provided and theoretical nurse assistance was computed, the difference between the two quantifying the ICU use of personnel: a positive difference means over-utilization, a negative one under-utilization. We calculated the maximum number of high-level and low-level care days available for ICU and the relative utilization rates. These two rates quantify the appropriateness of resource use in relation to the planned use. Analysing 5783 treatment-days, the tool identified units using almost all available resources (five), overcrowded (14: too small units) or empty (16: too big). Units were overcrowded on account of the high-level of care required (five: utilization rate >100%) or reallocated too much of their residual high-care nursing capacity to low-level care (six). In empty units both utilization rates were lower than expected. The method quantifies the rate and appropriateness of resource usage and suggests the best management in units with fixed human resources or a fixed number of beds.
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