Objective: Patients admitted to the intensive care unit greatly differ in severity and intensity of care. We devised a system for selecting high-risk patients that reduces bias by excluding low-risk patients and patients with an early death irrespective of the treatment. Design: A posteriori analysis of a multiple-center prospective observational trial. Setting: A total of 89 units from 12 European countries, with 12,615 patients. Intervention: Demographic and clinical data: severity of illness at admission, daily score of nursing workload, length of stay, and hospital mortality. Methods: We enrolled patients with intensive care unit length of stay of >24 hrs. Three groups of high-risk patients were created: a) Severity group, those with Simplified Acute Physiology Score (SAPS II) over the median; b) Intensity-of-care group, patients with >1 day of high level of care (assessed by logistic analysis); and c) MIX group, patients fulfilling both Severity and Intensity-of-care criteria. The groups were included in a logistic regression model (random split-sample design) to identify the characteristics associated with hospital mortality. We compared the outcome prediction of the SAPS II model (unsplit sample) against our model. Main Results: Out of 8,248 patients, the Severity method selected 3,838 patients, Intensity-of-care selected 4,244, and both methods combined selected 2,662 patients. There were 2,828 low-risk patients. Significant associations with hospital mortality were observed for: age, sites of admission, medical/unscheduled surgical admission, acute physiologic score of SAPS II, and the indicator variable "only Severity," "only Intensity-of-care," or MIX (developmental sample: calibration chi-square test, p = .205; area under the receiver operation characteristic curve, 0.814). Calibration and discrimination were better in our model than with the SAPS II model (unsplit sample). Conclusion: All three indicator variables select high-risk patients, the Severity/Intensity-of-care MIX being the most robust. These stratification criteria can improve case-mix selection for clinical and organizational studies. Copyright

Scoring system for the selection of high-risk patients in the intensive care unit / G. Iapichino, G. Mistraletti, D. Corbella, G. Bassi, E. Borotto, DR. Miranda, A. Morabito. - In: CRITICAL CARE MEDICINE. - ISSN 0090-3493. - 34:4(2006), pp. 1039-1043.

Scoring system for the selection of high-risk patients in the intensive care unit

G. Iapichino
Primo
;
G. Mistraletti
Secondo
;
D. Corbella;G. Bassi;E. Borotto;A. Morabito
Ultimo
2006

Abstract

Objective: Patients admitted to the intensive care unit greatly differ in severity and intensity of care. We devised a system for selecting high-risk patients that reduces bias by excluding low-risk patients and patients with an early death irrespective of the treatment. Design: A posteriori analysis of a multiple-center prospective observational trial. Setting: A total of 89 units from 12 European countries, with 12,615 patients. Intervention: Demographic and clinical data: severity of illness at admission, daily score of nursing workload, length of stay, and hospital mortality. Methods: We enrolled patients with intensive care unit length of stay of >24 hrs. Three groups of high-risk patients were created: a) Severity group, those with Simplified Acute Physiology Score (SAPS II) over the median; b) Intensity-of-care group, patients with >1 day of high level of care (assessed by logistic analysis); and c) MIX group, patients fulfilling both Severity and Intensity-of-care criteria. The groups were included in a logistic regression model (random split-sample design) to identify the characteristics associated with hospital mortality. We compared the outcome prediction of the SAPS II model (unsplit sample) against our model. Main Results: Out of 8,248 patients, the Severity method selected 3,838 patients, Intensity-of-care selected 4,244, and both methods combined selected 2,662 patients. There were 2,828 low-risk patients. Significant associations with hospital mortality were observed for: age, sites of admission, medical/unscheduled surgical admission, acute physiologic score of SAPS II, and the indicator variable "only Severity," "only Intensity-of-care," or MIX (developmental sample: calibration chi-square test, p = .205; area under the receiver operation characteristic curve, 0.814). Calibration and discrimination were better in our model than with the SAPS II model (unsplit sample). Conclusion: All three indicator variables select high-risk patients, the Severity/Intensity-of-care MIX being the most robust. These stratification criteria can improve case-mix selection for clinical and organizational studies. Copyright
Critically ill; EURICUS; High risk; Intensity of care; Risk stratification; Severity
Settore MED/41 - Anestesiologia
Settore MED/01 - Statistica Medica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/22883
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