Logistic regression model to predict outcome after in-hospital cardiac arrest: validation, accuracy, sensitivity and specificity

被引:13
作者
Dodek, PM [1 ]
Wiggs, BR [1 ]
机构
[1] St Pauls Hosp, Pulm Res Lab, Vancouver, BC V6Z 1Y6, Canada
关键词
cardiac arrest; inpatient; outcome; predictors; logistic regression;
D O I
10.1016/S0300-9572(98)00012-4
中图分类号
R4 [临床医学];
学科分类号
1002 ; 100602 ;
摘要
Objective: To develop and validate a logistic regression model to identify predictors of death before hospital discharge after in-hospital cardiac arrest. Design: Retrospective derivation and validation cohorts over two 1 year periods. Data from all in-hospital cardiac arrests in 1986-87 were used to derive a logistic regression model in which the estimated probability of death before hospital discharge was a function of patient and arrest descriptors, major underlying diagnosis, initial cardiac rhythm, and time of year. This model was validated in a separate data set from 1989-90 in the same hospital. Calculated for each case was 95% confidence limits (C.L.) about the estimated probability of death. In addition, accuracy, sensitivity, and specificity of estimated probability of death and lower 95% C.L. of the estimated probability of death in the derivation and validation data sets were calculated. Setting. 560-bed university teaching hospital. Patients: The derivation data set described 270 cardiac arrests in 197 inpatients. The validation data set described 158 cardiac arrests in 120 inpatients. Interventions: none. Measurements and results: Death before hospital discharge was the main outcome measure. Age, female gender, number of previous cardiac arrests, and electrical-mechanical dissociation were significant variables associated with a higher probability of death. Underlying coronary artery disease or valvular heart disease, ventricular tachycardia, and cardiac arrest during the period July-September were significant variables associated with a lower probability of death. Optimal sensitivity and specificity in the validation set were achieved at a cut-off probability of 0.85. Conclusions: Performance of this logistic regression model depends on the cut-off probability chosen to discriminate between predicted survival and predicted death and on whether the estimated probability or the lower 95% C.L. of the estimated probability is used. This model may inform the development of clinical practice guidelines for patients who are at risk of or who experience in-hospital cardiac arrest. (C) 1998 Elsevier Science Ireland Ltd. All rights reserved.
引用
收藏
页码:201 / 208
页数:8
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