Elsevier

Critical Care Clinics

Volume 13, Issue 2, 1 April 1997, Pages 389-408
Critical Care Clinics

INTERNATIONAL COMPARISONS OF CRITICAL CARE OUTCOME AND RESOURCE CONSUMPTION

https://doi.org/10.1016/S0749-0704(05)70317-1Get rights and content

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THE DENOMINATOR ("AT RISK") POPULATION

Evaluations of critical care populations have typically only analyzed patients admitted to an ICU.41, 71, 84 Thus, there is no information regarding the outcome of patients who may have benefited from, but did not receive, ICU management. If we assume that ICU admission policies are equivalent across ICUs, then we can assume that each ICU provides a similar level of support to the population served. The performance of that ICU in terms of patient treatment and outcome could then be compared.

THE NUMERATOR ("ICU-TREATED") POPULATION

Having described the universe of potential ICU admissions, we believe that those patients admitted to an ICU can now be considered in a broader context of a health delivery system. Problems confounding international comparisons of performance remain. We must consider what constitutes an ICU and adjust for differences in the case-mix of those admitted to an ICU.

The definition of an ICU has plagued researchers since the inception of critical care. With certain standard hospital guidelines, such

THE USE OF RISK-ADJUSTMENT MODELS

Risk-adjustment models have been applied across countries primarily in three ways. First, systems developed in the United States have been exported to other countries for intranational use. For example, APACHE II was used to look at several different ICU outcomes in England.67 Second, models developed in the United States have been used to compare ICU performance in other countries with that in the United States.41, 71, 84 Inferences about relative ICU performance are made in comparison with

CROSS-SECTIONAL VERSUS LONGITUDINAL STUDY DESIGN

Traditionally, investigators assessing ICU performance have examined overall mortality and length of stay (LOS) during the portion of a patient's care that occurred while in the ICU and hospital. This approach takes advantage of available risk stratification tools and allows an ICU to be judged on the basis of all patients treated within its confines.41, 60, 71, 84 A significant drawback of this approach is the limited time period over which an overall disease process is assessed. Ultimately,

OUTCOME

Having defined the study population, the elements of care that represent the critical care delivery system, and the methods by which to control for patient variation and study ICU performance either in isolation or as part of a continuum of care, the remaining challenge is to define the dependent variables by which to compare one delivery system with another. Using the two paradigms that characterize the optimal system described herein, the comparisons can arguably be made by measuring some

INTRASYSTEM HETEROGENEITY

Another difficulty in comparing systems is the natural heterogeneity that exists within a system. Much work has been done on variation in a variety of aspects of health care in the United States over the last 20 years (e.g., upper gastrointestinal endoscopy, coronary artery angiography and surgery, and carotid end-arterectomy rates).1, 18, 33, 54, 65, 82 Though there is less information on variation in critical care, we do know that such differences exist.5, 16, 19, 22, 32, 42, 45, 48, 56, 62,

SUMMARY

Though there are reasonable data to suggest that certain countries, such as the United States, spend considerably more money on the provision of critical care services than others, there is little information regarding the added benefits accrued with this additional expense. Studies to date have suggested little if no difference in outcome but have been limited in their size, design, and choice of outcome measures. Furthermore, significant underlying societal priorities and philosophy may

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    Address reprint requests to Derek C. Angus, MB, ChB, MPH Room 606B, Scaife Hall Critical Care Medicine University of Pittsburgh 200 Lothrop Street Pittsburgh, PA 15213

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