A Novel Machine Learning Model for Predicting Stroke-Associated Pneumonia After Spontaneous Intracerebral Hemorrhage

<black square> BACKGROUND: Pneumonia is one of the most common complications after spontaneous intracerebral hemorrhage (sICH), i.e., stroke-associated pneumonia (SAP). Timely identification of targeted patients is beneficial to reduce poor prognosis. So far, there is no consensus on prediction, and application of existing predictors is limited. The aim of this study was to develop a machine learning model to predict SAP after sICH. <black square> METHODS: We retrospectively reviewed 748 patients diagnosed with sICH and collected data from 4 mensions-demographic features, clinical features, medical history, and laboratory tests. Five machine learning algorithms-logistic regression, gradient boosting decision tree, random forest, extreme gradient boosting, category boosting-were used to build and validate predictive model. We also applied recursive feature elimination with cross-validation to obtain the best feature combination for each model. Predictive performance evaluated by area under the receiver operating characteristic curve. <black square> RESULTS: SAP was diagnosed in 237 patients. The model developed by category boosting yielded the most satisfactory outcomes overall with area under the receiver operating characteristic curves in the training set and set of 0.8307 and 0.8178, respectively. <black square> CONCLUSIONS: The incidence of SAP after sICH in center was 31.68%. Machine learning could potentially provide assistance in the prediction of SAP after sICH.