Article(id=1322190346147185568, tenantId=1146029695717560320, journalId=1319373162502258839, issueId=1322190316019499694, articleNumber=null, orderNo=null, doi=10.16016/j.2097-0927.202507047, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1752508800000, receivedDateStr=2025-07-15, revisedDate=1753977600000, revisedDateStr=2025-08-01, acceptedDate=null, acceptedDateStr=null, onlineDate=1793164343629, onlineDateStr=2026-10-28, pubDate=1756483200000, pubDateStr=2025-08-30, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793164343629, onlineIssueDateStr=2026-10-28, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793164343629, creator=13701087609, updateTime=1793164343629, updator=13701087609, issue=Issue{id=1322190316019499694, tenantId=1146029695717560320, journalId=1319373162502258839, year='2025', volume='47', issue='16', pageStart='1825', pageEnd='1980', issueExtLink='null', onlineDate='null', pubDate='1756483200000', pubDateStr='2025-08-30', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1793164336447, creator='13701087609', updateTime=1793164553187, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322191225206198613, tenantId=1146029695717560320, journalId=1319373162502258839, issueId=1322190316019499694, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322191225206198614, tenantId=1146029695717560320, journalId=1319373162502258839, issueId=1322190316019499694, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1970, endPage=1980, ext={EN=ArticleExt(id=1322190346352706465, articleId=1322190346147185568, tenantId=1146029695717560320, journalId=1319373162502258839, language=EN, title=Risk factors for postoperative respiratory failure in patients undergoing cardiovascular surgery and construction of a prediction model, columnId=1320435174995772212, journalTitle=Journal of Army Medical University, columnName=Clinical Medicine, runingTitle=null, highlight=null, articleAbstract=
Objective To identify risk factors for postoperative respiratory failure (PORF) in cardiovascular surgery patients using machine learning algorithms and to construct a specific risk prediction model.
Methods A retrospective cohort was conducted on 1 623 patients undergoing cardiovascular surgery between 2011 and 2020 from the INSPIRE database. Following data quality analysis, multiple imputation was employed to handle missing data, and the Boruta algorithm was used for feature selection. Eight machine learning models were constructed based on the selected features, including Gradient Boosting Machine (GBM), Generalized Linear Model (GLM), Extreme Gradient Boosting (XGBoost), K-Nearest Neighbors (KNN), Neural Network (NNET), Naive Bayes (NB), Support Vector Machine (SVM), and Random Forest (RF). Model performance was evaluated using metrics including the area under the curve (AUC), sensitivity, and specificity. Variables significantly influencing PORF were identified using the permutation importance algorithm.
Results The overall incidence of PORF was 27.05% (439/1 623). The in-hospital mortality rate was significantly higher in the PORF group than the non-PORF group (12.98% vs 1.60%, P<0.001). Among the developed models, the SVM model demonstrated the best performance, achieving an AUC of 0.705 in the testing set, with a sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of 0.481, 0.825, 0.504, and 0.812, respectively. Based on feature importance analysis, the top 10 variables most predictive of PORF were anesthesia duration, arterial partial pressure of carbon dioxide (PaCO₂), calcium level, lymphocyte percentage, cardiopulmonary bypass duration, intraoperative blood loss, age, creatinine level, aspartate aminotransferase (AST) level, and activated partial thromboplastin time (aPTT).
Conclusion A predictieon model for PORF following cardiovascular surgery is successfully developed. This model can identify high-risk patients and estimate their probability of developing respiratory failure, thereby facilitating data-driven clinical decision-making.
, authors=Fuchao ZHOU, Xiang LIU, Kaizhi LU, Jianliang SHAO, authorsList=Fuchao ZHOU, Xiang LIU, Kaizhi LU, Jianliang SHAO, authorCompany=null, correspAuthors=Kaizhi LU, Jianliang SHAO, authorNote=null, correspAuthorsNote=null, copyrightStatement=© 2025 Journal of Army Medical University, copyrightOwner=Editorial Office of Journal of Army Medical University, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322190349120947114, articleId=1322190346147185568, tenantId=1146029695717560320, journalId=1319373162502258839, language=CN, title=心血管手术患者术后呼吸衰竭的危险因素及预测模型构建, columnId=1322185541475488183, journalTitle=陆军军医大学学报, columnName=临床医学, runingTitle=null, highlight=null, articleAbstract=
目的 基于机器学习算法识别心血管手术患者术后呼吸衰竭(postoperative respiratory failure,PORF)的危险因素,并构建特异性的风险预测模型。
方法 回顾性的纳入INSPIRE数据库2011到2020年间行心血管手术的1 623例患者,进行数据质量分析后,使用多重插补处理缺失数据,并采用Boruta筛选相关特征变量。基于筛选指标构建8种机器学习模型,包括GBM、GLM、XGBoost、KNN、NNET、NB、SVM及RF,以曲线下面积(area under the curve,AUC)、灵敏度、特异性等指标评估模型性能,并基于排列重要性算法识别对PORF有重要影响的变量。
结果 PORF总体发生率为27.05%(439/1 623),PORF组患者院内死亡率显著高于非PORF组(12.98% vs. 1.60%,P<0.001)。建立的预测模型中,SVM模型效果较好,在测试集中,该模型AUC达到0.705,其灵敏度、特异度、阳性和阴性预测值分别为0.481、0.825、0.504、0.812。根据特征重要性计算,对术后呼吸衰竭预测影响最大的前十个变量为麻醉时长、动脉血二氧化碳分压、钙、淋巴细胞百分比、体外循环时长、术中出血量、年龄、肌酐、天门冬氨基酸氨基转移酶和活化部分凝血活酶时间。
结论 本研究成功构建了预测心血管手术患者术后呼吸衰竭的模型,该模型可以识别出高危患者及其发生呼吸衰竭的概率,促进数据驱动的临床决策。
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1Department of Anesthesiology,First Affiliated Hospital,Army Medical University (Third Military Medical University),Chongqing,China), AuthorCompanyExt(id=1322190349364216749, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, companyId=1322190349347439531, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1陆军军医大学(第三军医大学)第一附属医院麻醉科,重庆)])], figs=[ArticleFig(id=1322190351100658634, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=EN, label=Figure 1, caption=
Flowchart for inclusion and exclusion of the participants, figureFileSmall=TNwNqjVpWGUlusgD6pdgBw==, figureFileBig=qq03vbJMIk6fhwuD+5HQTw==, tableContent=null), ArticleFig(id=1322190351176156107, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=CN, label=图1, caption=
纳入排除流程情况, figureFileSmall=TNwNqjVpWGUlusgD6pdgBw==, figureFileBig=qq03vbJMIk6fhwuD+5HQTw==, tableContent=null), ArticleFig(id=1322190351377482700, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=EN, label=Figure 2, caption=
Feature selection using Boruta, figureFileSmall=UAgvU7OdZHWTj1/hpq1/1Q==, figureFileBig=8dzo4Z1khsQd0ofsN+VfHQ==, tableContent=null), ArticleFig(id=1322190351452980173, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=CN, label=图2, caption=
Boruta特征选择示意图Green indicates importance,yellow indicates temporary importance,blue indicates shadow values,and red indicates unimportance
, figureFileSmall=UAgvU7OdZHWTj1/hpq1/1Q==, figureFileBig=8dzo4Z1khsQd0ofsN+VfHQ==, tableContent=null), ArticleFig(id=1322190351528477646, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=EN, label=Figure 3, caption=
Performance of 8 respiratory failure prediction models, figureFileSmall=dJcvG3R/FAlMgug9zKV4Jg==, figureFileBig=0utYv4VCYt4U74/PZhUaFg==, tableContent=null), ArticleFig(id=1322190351599780815, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=CN, label=图3, caption=
8种呼吸衰竭预测模型表现A,B,and C:the ROC curve,calibration curve,and decision curve of the training set respiratory failure prediction model,respectively; D,E,and F:the ROC curve,calibration curve,and decision curve of the test set respiratory failure prediction model,respectively
, figureFileSmall=dJcvG3R/FAlMgug9zKV4Jg==, figureFileBig=0utYv4VCYt4U74/PZhUaFg==, tableContent=null), ArticleFig(id=1322190351687861200, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=EN, label=Figure 4, caption=
Ranking of Feature Importance, figureFileSmall=uNe2M9K6KDkLm2fRlRO1sw==, figureFileBig=rOWWCWwXxoRxFljidPRlAw==, tableContent=null), ArticleFig(id=1322190353365582801, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=CN, label=图4, caption=
特征重要性排序PaCO2:partial pressure of carbon dioxide; CPB:cardiopulmonary bypass; AST:aspartate amino transferase; APTT:activated partial thromboplastin time
, figureFileSmall=uNe2M9K6KDkLm2fRlRO1sw==, figureFileBig=rOWWCWwXxoRxFljidPRlAw==, tableContent=null), ArticleFig(id=1322190353462051794, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=EN, label=Table 1, caption=
Baseline demographic data of the postoperative respiratory failure group and the non-postoperative respiratory failure group [M(P25,P75),n(%)]
, figureFileSmall=null, figureFileBig=null, tableContent=
| Indicators | Non-postoperative respiratory failure (n=1 184) | Postoperative respiratory failure (n=439) | Z/χ2 | P-value |
|---|
| Age,years | 60.00(50.00,70.00) | 65.00(55.00,75.00) | -2.928 | 0.003 |
| Gender | | | 25.816 | <0.001 |
| Female | 591(49.92%) | 157(35.76%) | | |
| Male | 593(50.08%) | 282(64.24%) | | |
| Body Mass Index/(kg/m²) | 23.42(21.19,25.76) | 23.38(20.43,25.91) | -1.242 | 0.214 |
| ASA | | | 64.513 | <0.001 |
| Ⅰ | 116(9.96%) | 28(6.50%) | | |
| Ⅱ | 481(41.29%) | 103(23.90%) | | |
| Ⅲ | 525(45.06%) | 260(60.32%) | | |
| Ⅳ | 42(3.61%) | 38(8.82%) | | |
| Ⅴ | 1(0.09%) | 2(0.46%) | | |
| Emergency | | | 1.615 | 0.204 |
| No | 1 047(88.43%) | 378(86.10%) | | |
| Yes | 137(11.57%) | 61(13.90%) | | |
| Anesthesia method | | | 4.859 | 0.088 |
| Monitoring Anesthesia | 10(0.84%) | 0(0.00%) | | |
| Nerve Block Anesthesia | 3(0.25%) | 0(0.00%) | | |
| General Anesthesia | 1 171(98.90%) | 439(100.00%) | | |
| Surgery type | | | 14.195 | 0.007 |
| Pericardial Surgery | 55(4.65%) | 14(3.19%) | | |
| Great Vessel Surgery | 17(1.44%) | 5(1.14%) | | |
| Coronary Surgery | 168(14.19%) | 95(21.64%) | | |
| Valve Surgery | 736(62.16%) | 256(58.31%) | | |
| Other | 208(17.57%) | 69(15.72%) | | |
), ArticleFig(id=1322190353722098643, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=CN, label=表1, caption=
术后呼吸衰竭组和非呼吸衰竭组的人口特征基线表
, figureFileSmall=null, figureFileBig=null, tableContent=
| Indicators | Non-postoperative respiratory failure (n=1 184) | Postoperative respiratory failure (n=439) | Z/χ2 | P-value |
|---|
| Age,years | 60.00(50.00,70.00) | 65.00(55.00,75.00) | -2.928 | 0.003 |
| Gender | | | 25.816 | <0.001 |
| Female | 591(49.92%) | 157(35.76%) | | |
| Male | 593(50.08%) | 282(64.24%) | | |
| Body Mass Index/(kg/m²) | 23.42(21.19,25.76) | 23.38(20.43,25.91) | -1.242 | 0.214 |
| ASA | | | 64.513 | <0.001 |
| Ⅰ | 116(9.96%) | 28(6.50%) | | |
| Ⅱ | 481(41.29%) | 103(23.90%) | | |
| Ⅲ | 525(45.06%) | 260(60.32%) | | |
| Ⅳ | 42(3.61%) | 38(8.82%) | | |
| Ⅴ | 1(0.09%) | 2(0.46%) | | |
| Emergency | | | 1.615 | 0.204 |
| No | 1 047(88.43%) | 378(86.10%) | | |
| Yes | 137(11.57%) | 61(13.90%) | | |
| Anesthesia method | | | 4.859 | 0.088 |
| Monitoring Anesthesia | 10(0.84%) | 0(0.00%) | | |
| Nerve Block Anesthesia | 3(0.25%) | 0(0.00%) | | |
| General Anesthesia | 1 171(98.90%) | 439(100.00%) | | |
| Surgery type | | | 14.195 | 0.007 |
| Pericardial Surgery | 55(4.65%) | 14(3.19%) | | |
| Great Vessel Surgery | 17(1.44%) | 5(1.14%) | | |
| Coronary Surgery | 168(14.19%) | 95(21.64%) | | |
| Valve Surgery | 736(62.16%) | 256(58.31%) | | |
| Other | 208(17.57%) | 69(15.72%) | | |
), ArticleFig(id=1322190353797596116, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=EN, label=Table 1, caption=
Baseline demographic data of the postoperative respiratory failure group and the non-postoperative respiratory failure group [M(P25,P75),n(%)]
, figureFileSmall=null, figureFileBig=null, tableContent=
| Indicators | Non-postoperative respiratory failure (n=1 184) | Postoperative respiratory failure (n=439) | Z/χ2 | P-value |
|---|
| Surgical Approach | | | 1.033 | 0.310 |
| Minimally Invasive | 32(2.70%) | 8(1.82%) | | |
| Open | 1 152(97.30%) | 431(98.18%) | | |
| Anesthesia Duration,minutes | 315.00(220.00,420.00) | 425.00(331.25,520.00) | -11.781 | <0.001 |
| Cardiopulmonary Bypass Duration,minutes | 115.00(0.00,190.00) | 185.00(115.00,240.00) | -10.702 | <0.001 |
| Surgical Blood Loss/mL | 240.56(0.00,698.36) | 385.92(0.00,931.39) | -3.057 | 0.002 |
| Creatinine/(mmol/L) | 0.84(0.71,1.05) | 0.92(0.77,1.16) | -5.903 | <0.001 |
| Blood Urea Nitrogen/(mg/dL) | 16.00(12.00,21.00) | 17.00(12.00,21.00) | -3.147 | 0.002 |
| Phosphorus/(mmol/L) | 3.60(3.20,3.90) | 3.50(2.90,3.90) | -1.504 | 0.133 |
| Chloride/(mg/dL) | 104.00(102.00,106.00) | 103.00(100.25,106.00) | -2.743 | 0.006 |
| Potassium/(mmol/L) | 3.60(3.40,4.00) | 3.80(3.40,4.00) | -1.856 | 0.063 |
| Sodium/(mmol/L) | 137.00(136.00,139.00) | 136.00(135.00,139.00) | -6.599 | <0.001 |
| Alanine Aminotransferase/(U/L) | 18.00(13.00,27.00) | 20.00(13.00,30.00) | -1.922 | 0.055 |
| Aspartate Aminotransferase/(U/L) | 22.00(18.00,28.00) | 24.00(19.00,35.00) | -5.385 | <0.001 |
| Alkaline Phosphatase/(U/L) | 64.00(52.00,80.00) | 68.00(55.00,86.00) | -2.667 | 0.008 |
| Total Bilirubin/(mg/dL) | 0.70(0.50,0.80) | 0.80(0.50,1.20) | -5.705 | <0.001 |
| Albumin/(g/dL) | 4.10(3.90,4.30) | 4.00(3.60,4.20) | -5.584 | <0.001 |
| Total Protein/(g/dL) | 6.90(6.50,7.30) | 6.90(6.40,7.30) | -2.776 | 0.006 |
| Calcium/(mg/dL) | 9.00(8.60,9.30) | 8.80(8.50,9.20) | -4.186 | <0.001 |
| Fibrinogen/(mg/dL) | 301.00(263.00,357.00) | 301.00(263.00,357.00) | -1.170 | 0.242 |
| Activated Partial Thromboplastin Time,seconds | 31.70(29.60,34.70) | 33.80(30.10,38.20) | -6.456 | <0.001 |
| International Normalized Ratio | 1.00(0.95,1.07) | 1.03(0.97,1.20) | -6.249 | <0.001 |
| Blood Glucose/(mg/dL) | 105.00(91.00,132.00) | 115.00(96.00,145.00) | -4.633 | <0.001 |
| Lymphocyte Percentage | 28.70(22.10,37.80) | 24.10(18.30,31.30) | -6.262 | <0.001 |
| Neutrophil Percentage | 58.60(53.10,67.50) | 63.20(56.00,71.70) | -5.420 | <0.001 |
| Platelet/(×10³/μL) | 211.00(166.00,258.00) | 189.00(152.00,233.00) | -4.821 | <0.001 |
| Hematocrit | 35.20(31.00,40.40) | 35.20(30.00,39.75) | -1.724 | 0.085 |
| Hemoglobin/(g/dL) | 12.90(11.60,14.20) | 12.50(11.00,14.20) | -2.695 | 0.007 |
| White Blood Cell/(×10³/μL) | 6.30(5.20,7.46) | 6.30(5.20,7.90) | -2.498 | 0.012 |
| C-Reactive Protein/(mg/dL) | 0.11(0.02,0.31) | 0.19(0.06,0.77) | -6.286 | <0.001 |
| Lactic Acid/(mmol/L) | 0.90(0.60,1.40) | 0.90(0.80,1.50) | -1.417 | 0.156 |
| Ionized Calcium/(mmol/L) | 1.10(1.06,1.14) | 1.10(1.05,1.14) | -0.437 | 0.662 |
| Oxygen Saturation | 99.00(98.00,100.00) | 99.20(98.00,100.00) | -0.904 | 0.366 |
| Bicarbonate/(mmol/L) | 25.40(24.20,27.20) | 25.80(23.80,27.80) | -2.260 | 0.024 |
| Arterial Oxygen Pressure/mmHg | 153.00(110.00,209.00) | 165.00(110.00,227.80) | -0.790 | 0.43 |
| Arterial Carbon Dioxide Pressure/mmHg | 38.00(35.00,41.40) | 40.00(35.00,42.30) | -2.697 | 0.007 |
| pH | 7.42(7.40,7.45) | 7.42(7.39,7.46) | -0.178 | 0.859 |
| Residual Alkali/(mmol/L) | 0.40(-1.40,1.30) | 0.40(-1.40,2.30) | -0.061 | 0.061 |
| Chronic obstructive pulmonary disease | 24(2.0%) | 10(2.3%) | 0.098 | 0.754 |
| Cerebrovascular disease | 107(9.04%) | 31(7.06%) | 1.607 | 0.205 |
| Major cardiovascular disease | 502(42.40%) | 255(58.09%) | 31.670 | <0.001 |
| Hypertension | 147(12.42%) | 75(17.08%) | 5.912 | 0.015 |
| Diabetes | 100(8.45%) | 45(10.25%) | 1.282 | 0.258 |
| Coagulation Dysfunction | 8(0.68%) | 19(4.33%) | 26.114 | <0.001 |
| In-hospital death | 19(1.60%) | 57(12.98%) | 92.910 | <0.001 |
| Preoperative use of tranexamic acid | 30(2.53%) | 33(7.52%) | 21.316 | <0.001 |
| Preoperative use of β-blockers | 354(29.90%) | 145(33.03%) | 1.474 | 0.225 |
| Preoperative use of ACEI drugs | 41(3.46%) | 29(6.61%) | 7.666 | 0.006 |
), ArticleFig(id=1322190353889870805, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=CN, label=续表1, caption=
术后呼吸衰竭组和非呼吸衰竭组的人口特征基线表
, figureFileSmall=null, figureFileBig=null, tableContent=
| Indicators | Non-postoperative respiratory failure (n=1 184) | Postoperative respiratory failure (n=439) | Z/χ2 | P-value |
|---|
| Surgical Approach | | | 1.033 | 0.310 |
| Minimally Invasive | 32(2.70%) | 8(1.82%) | | |
| Open | 1 152(97.30%) | 431(98.18%) | | |
| Anesthesia Duration,minutes | 315.00(220.00,420.00) | 425.00(331.25,520.00) | -11.781 | <0.001 |
| Cardiopulmonary Bypass Duration,minutes | 115.00(0.00,190.00) | 185.00(115.00,240.00) | -10.702 | <0.001 |
| Surgical Blood Loss/mL | 240.56(0.00,698.36) | 385.92(0.00,931.39) | -3.057 | 0.002 |
| Creatinine/(mmol/L) | 0.84(0.71,1.05) | 0.92(0.77,1.16) | -5.903 | <0.001 |
| Blood Urea Nitrogen/(mg/dL) | 16.00(12.00,21.00) | 17.00(12.00,21.00) | -3.147 | 0.002 |
| Phosphorus/(mmol/L) | 3.60(3.20,3.90) | 3.50(2.90,3.90) | -1.504 | 0.133 |
| Chloride/(mg/dL) | 104.00(102.00,106.00) | 103.00(100.25,106.00) | -2.743 | 0.006 |
| Potassium/(mmol/L) | 3.60(3.40,4.00) | 3.80(3.40,4.00) | -1.856 | 0.063 |
| Sodium/(mmol/L) | 137.00(136.00,139.00) | 136.00(135.00,139.00) | -6.599 | <0.001 |
| Alanine Aminotransferase/(U/L) | 18.00(13.00,27.00) | 20.00(13.00,30.00) | -1.922 | 0.055 |
| Aspartate Aminotransferase/(U/L) | 22.00(18.00,28.00) | 24.00(19.00,35.00) | -5.385 | <0.001 |
| Alkaline Phosphatase/(U/L) | 64.00(52.00,80.00) | 68.00(55.00,86.00) | -2.667 | 0.008 |
| Total Bilirubin/(mg/dL) | 0.70(0.50,0.80) | 0.80(0.50,1.20) | -5.705 | <0.001 |
| Albumin/(g/dL) | 4.10(3.90,4.30) | 4.00(3.60,4.20) | -5.584 | <0.001 |
| Total Protein/(g/dL) | 6.90(6.50,7.30) | 6.90(6.40,7.30) | -2.776 | 0.006 |
| Calcium/(mg/dL) | 9.00(8.60,9.30) | 8.80(8.50,9.20) | -4.186 | <0.001 |
| Fibrinogen/(mg/dL) | 301.00(263.00,357.00) | 301.00(263.00,357.00) | -1.170 | 0.242 |
| Activated Partial Thromboplastin Time,seconds | 31.70(29.60,34.70) | 33.80(30.10,38.20) | -6.456 | <0.001 |
| International Normalized Ratio | 1.00(0.95,1.07) | 1.03(0.97,1.20) | -6.249 | <0.001 |
| Blood Glucose/(mg/dL) | 105.00(91.00,132.00) | 115.00(96.00,145.00) | -4.633 | <0.001 |
| Lymphocyte Percentage | 28.70(22.10,37.80) | 24.10(18.30,31.30) | -6.262 | <0.001 |
| Neutrophil Percentage | 58.60(53.10,67.50) | 63.20(56.00,71.70) | -5.420 | <0.001 |
| Platelet/(×10³/μL) | 211.00(166.00,258.00) | 189.00(152.00,233.00) | -4.821 | <0.001 |
| Hematocrit | 35.20(31.00,40.40) | 35.20(30.00,39.75) | -1.724 | 0.085 |
| Hemoglobin/(g/dL) | 12.90(11.60,14.20) | 12.50(11.00,14.20) | -2.695 | 0.007 |
| White Blood Cell/(×10³/μL) | 6.30(5.20,7.46) | 6.30(5.20,7.90) | -2.498 | 0.012 |
| C-Reactive Protein/(mg/dL) | 0.11(0.02,0.31) | 0.19(0.06,0.77) | -6.286 | <0.001 |
| Lactic Acid/(mmol/L) | 0.90(0.60,1.40) | 0.90(0.80,1.50) | -1.417 | 0.156 |
| Ionized Calcium/(mmol/L) | 1.10(1.06,1.14) | 1.10(1.05,1.14) | -0.437 | 0.662 |
| Oxygen Saturation | 99.00(98.00,100.00) | 99.20(98.00,100.00) | -0.904 | 0.366 |
| Bicarbonate/(mmol/L) | 25.40(24.20,27.20) | 25.80(23.80,27.80) | -2.260 | 0.024 |
| Arterial Oxygen Pressure/mmHg | 153.00(110.00,209.00) | 165.00(110.00,227.80) | -0.790 | 0.43 |
| Arterial Carbon Dioxide Pressure/mmHg | 38.00(35.00,41.40) | 40.00(35.00,42.30) | -2.697 | 0.007 |
| pH | 7.42(7.40,7.45) | 7.42(7.39,7.46) | -0.178 | 0.859 |
| Residual Alkali/(mmol/L) | 0.40(-1.40,1.30) | 0.40(-1.40,2.30) | -0.061 | 0.061 |
| Chronic obstructive pulmonary disease | 24(2.0%) | 10(2.3%) | 0.098 | 0.754 |
| Cerebrovascular disease | 107(9.04%) | 31(7.06%) | 1.607 | 0.205 |
| Major cardiovascular disease | 502(42.40%) | 255(58.09%) | 31.670 | <0.001 |
| Hypertension | 147(12.42%) | 75(17.08%) | 5.912 | 0.015 |
| Diabetes | 100(8.45%) | 45(10.25%) | 1.282 | 0.258 |
| Coagulation Dysfunction | 8(0.68%) | 19(4.33%) | 26.114 | <0.001 |
| In-hospital death | 19(1.60%) | 57(12.98%) | 92.910 | <0.001 |
| Preoperative use of tranexamic acid | 30(2.53%) | 33(7.52%) | 21.316 | <0.001 |
| Preoperative use of β-blockers | 354(29.90%) | 145(33.03%) | 1.474 | 0.225 |
| Preoperative use of ACEI drugs | 41(3.46%) | 29(6.61%) | 7.666 | 0.006 |
), ArticleFig(id=1322190354158306262, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=EN, label=Table 2, caption=
Information about the missing data
, figureFileSmall=null, figureFileBig=null, tableContent=
| Index | Missing number(n) | Missing Percentage | Index | Missing number(n) | Missing Percentage |
|---|
| Body Mass Index | 9 | 0.55% | International Normalized Ratio | 36 | 2.22% |
| ASA | 27 | 1.66% | Glucose | 27 | 1.66% |
| Creatinine | 24 | 1.48% | Lymphocytes | 205 | 12.63% |
| Blood Urea Nitrogen | 28 | 1.73% | Neutrophils | 205 | 12.63% |
| Phosphorus | 41 | 2.53% | Platelets | 30 | 1.85% |
| Chloride | 20 | 1.23% | Hematocrit | 3 | 0.18% |
| Potassium | 7 | 0.43% | Hemoglobin | 21 | 1.29% |
| Sodium | 7 | 0.43% | White Blood Cells | 22 | 1.36% |
| Alanine Aminotransferase | 35 | 2.16% | C-Reactive Protein | 121 | 7.46% |
| Aspartate Aminotransferase | 35 | 2.16% | Lactic Acid | 302 | 18.61% |
| Alkaline Phosphatase | 52 | 3.20% | Ionized Calcium | 281 | 17.31% |
| Total Bilirubin | 53 | 3.27% | Oxygen Saturation | 90 | 5.55% |
| Albumin | 51 | 3.14% | Bicarbonate | 90 | 5.55% |
| Total Protein | 46 | 2.83% | Arterial Oxygen Pressure | 118 | 7.27% |
| Calcium | 41 | 2.53% | Arterial Carbon Dioxide Pressure | 118 | 7.27% |
| Fibrinogen | 69 | 4.25% | pH | 118 | 7.27% |
| Activated Partial Thromboplastin Time | 51 | 3.14% | Base Excess | 415 | 25.57% |
), ArticleFig(id=1322190354246386647, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=CN, label=表2, caption=
缺失情况表
, figureFileSmall=null, figureFileBig=null, tableContent=
| Index | Missing number(n) | Missing Percentage | Index | Missing number(n) | Missing Percentage |
|---|
| Body Mass Index | 9 | 0.55% | International Normalized Ratio | 36 | 2.22% |
| ASA | 27 | 1.66% | Glucose | 27 | 1.66% |
| Creatinine | 24 | 1.48% | Lymphocytes | 205 | 12.63% |
| Blood Urea Nitrogen | 28 | 1.73% | Neutrophils | 205 | 12.63% |
| Phosphorus | 41 | 2.53% | Platelets | 30 | 1.85% |
| Chloride | 20 | 1.23% | Hematocrit | 3 | 0.18% |
| Potassium | 7 | 0.43% | Hemoglobin | 21 | 1.29% |
| Sodium | 7 | 0.43% | White Blood Cells | 22 | 1.36% |
| Alanine Aminotransferase | 35 | 2.16% | C-Reactive Protein | 121 | 7.46% |
| Aspartate Aminotransferase | 35 | 2.16% | Lactic Acid | 302 | 18.61% |
| Alkaline Phosphatase | 52 | 3.20% | Ionized Calcium | 281 | 17.31% |
| Total Bilirubin | 53 | 3.27% | Oxygen Saturation | 90 | 5.55% |
| Albumin | 51 | 3.14% | Bicarbonate | 90 | 5.55% |
| Total Protein | 46 | 2.83% | Arterial Oxygen Pressure | 118 | 7.27% |
| Calcium | 41 | 2.53% | Arterial Carbon Dioxide Pressure | 118 | 7.27% |
| Fibrinogen | 69 | 4.25% | pH | 118 | 7.27% |
| Activated Partial Thromboplastin Time | 51 | 3.14% | Base Excess | 415 | 25.57% |
), ArticleFig(id=1322190354338661336, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=EN, label=Table 3, caption=
Statistical comparison before and after imputation of missing indicators [M(P25,P75),n(%)]
, figureFileSmall=null, figureFileBig=null, tableContent=
| Indicator | Before imputation | After imputation | Z/χ2 | P-value |
|---|
| BMI/(kg/m²) | 23.42 (21.00,25.78) | 23.42 (21.00,25.78) | -0.013 | 0.991 |
| ASA | | | 0.028 | 1 |
| Ⅰ | 144 (9.02%) | 148 (9.12%) | | |
| Ⅱ | 584 (36.59%) | 593 (36.54%) | | |
| Ⅲ | 785 (49.19%) | 799 (49.23%) | | |
| Ⅳ | 80 (5.01%) | 80 (4.93%) | | |
| Ⅴ | 3 (0.19%) | 3 (0.18%) | | |
| Creatinine/(mg/dL) | 0.84 (0.71,1.05) | 0.84 (0.71,1.05) | -0.140 | 0.903 |
| Blood Urea Nitrogen/(mg/dL) | 16.00 (12.00,21.00) | 16.00 (12.00,21.00) | -0.245 | 0.832 |
| Phosphorus/(mg/dL) | 3.50 (3.20,3.90) | 3.50 (3.20,3.90) | -0.125 | 0.914 |
| Chloride/(mmol/L) | 103.00 (101.00,106.00) | 103.00 (101.00,106.00) | -0.007 | 0.995 |
| Potassium/(mmol/L) | 3.60 (3.40,4.00) | 3.60 (3.40,4.00) | -0.960 | 0.934 |
| Sodium/(mmol/L) | 137.00 (135.00,139.00) | 137.00 (135.00,139.00) | -0.048 | 0.966 |
| Alanine Aminotransferase/(U/L) | 18.00 (13.00,30.00) | 18.00 (13.00,30.00) | -0.053 | 0.963 |
| Aspartate Aminotransferase/(U/L) | 23.00 (18.00,31.00) | 23.00 (18.00,31.00) | -0.108 | 0.926 |
| Alkaline Phosphatase/(U/L) | 64.00 (52.00,80.00) | 64.00 (52.00,80.00) | -0.200 | 0.986 |
| Total Bilirubin/(mg/dL) | 0.70 (0.50,1.00) | 0.70 (0.50,1.00) | -0.356 | 0.757 |
| Albumin/(g/dL) | 4.10 (3.80,4.30) | 4.10 (3.80,4.30) | -0.374 | 0.745 |
| Total Protein/(g/dL) | 6.90 (6.50,7.30) | 6.90 (6.50,7.30) | -0.142 | 0.902 |
| Calcium/(mg/dL) | 8.90 (8.60,9.30) | 8.90 (8.60,9.30) | -0.254 | 0.826 |
| Fibrinogen/(mg/dL) | 301.00 (263.00,357.00) | 301.00 (263.00,357.00) | -0.138 | 0.905 |
| Activated Partial Thromboplastin Time,seconds | 32.30 (29.60,34.70) | 31.70 (29.60,34.70) | -0.339 | 0.768 |
| International Normalized Ratio | 1.00 (0.95,1.09) | 1.00 (0.95,1.09) | -0.369 | 0.749 |
| Glucose/(mg/dL) | 110.00 (91.00,138.00) | 110.00 (91.00,132.00) | -0.184 | 0.873 |
| Lymphocyte Percentage | 28.70 (20.10,34.10) | 28.70 (22.10,34.10) | -1.378 | 0.228 |
| Neutrophil Percentage | 61.00 (53.10,67.50) | 58.60 (53.10,67.50) | -1.357 | 0.235 |
| Platelets/(×10³/μL) | 200.00 (166.00,258.00) | 211.00 (166.00,258.00) | -0.133 | 0.908 |
| Hematocrit | 35.20 (31.00,40.40) | 35.20 (31.00,40.40) | -0.009 | 0.994 |
| Hemoglobin/(g/dL) | 12.90 (11.30,14.20) | 12.90 (11.30,14.20) | -0.197 | 0.864 |
| White Blood Cells/(×10³/μL) | 6.30 (5.20,7.46) | 6.30 (5.20,7.46) | -0.041 | 0.972 |
| C-Reactive Protein/(mg/dL) | 0.11 (0.06,0.50) | 0.11 (0.06,0.50) | 0.500 | 0.663 |
| Lactate/(mmol/L) | 0.90 (0.60,1.40) | 0.90 (0.60,1.40) | 0.606 | 0.593 |
| Ionized Calcium/(mmol/L) | 1.10 (1.05,1.14) | 1.10 (1.06,1.15) | -3.566 | 0.002 |
| Oxygen Saturation | 99.00 (98.00,100.00) | 99.00 (98.00,100.00) | -1.403 | 0.222 |
| Bicarbonate/(mmol/L) | 25.80 (23.80,27.20) | 25.40 (23.80,27.20) | -0.422 | 0.714 |
| Arterial Blood Oxygen Pressure/mmHg | 165.00 (110.00,227.80) | 153.00 (110.00,209.00) | -1.984 | 0.084 |
| Arterial Blood Carbon Dioxide Pressure/mmHg | 38.00 (35.00,41.40) | 38.00 (35.00,41.40) | -0.436 | 0.704 |
| pH | 7.42 (7.39,7.46) | 7.42 (7.40,7.46) | -0.024 | 0.983 |
| Base Excess/(mmol/L) | 0.40 (-1.40,1.80) | 0.40 (-1.40,1.80) | -0.684 | 0.544 |
), ArticleFig(id=1322190354477073369, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=CN, label=表3, caption=
缺失指标插补前后统计表
, figureFileSmall=null, figureFileBig=null, tableContent=
| Indicator | Before imputation | After imputation | Z/χ2 | P-value |
|---|
| BMI/(kg/m²) | 23.42 (21.00,25.78) | 23.42 (21.00,25.78) | -0.013 | 0.991 |
| ASA | | | 0.028 | 1 |
| Ⅰ | 144 (9.02%) | 148 (9.12%) | | |
| Ⅱ | 584 (36.59%) | 593 (36.54%) | | |
| Ⅲ | 785 (49.19%) | 799 (49.23%) | | |
| Ⅳ | 80 (5.01%) | 80 (4.93%) | | |
| Ⅴ | 3 (0.19%) | 3 (0.18%) | | |
| Creatinine/(mg/dL) | 0.84 (0.71,1.05) | 0.84 (0.71,1.05) | -0.140 | 0.903 |
| Blood Urea Nitrogen/(mg/dL) | 16.00 (12.00,21.00) | 16.00 (12.00,21.00) | -0.245 | 0.832 |
| Phosphorus/(mg/dL) | 3.50 (3.20,3.90) | 3.50 (3.20,3.90) | -0.125 | 0.914 |
| Chloride/(mmol/L) | 103.00 (101.00,106.00) | 103.00 (101.00,106.00) | -0.007 | 0.995 |
| Potassium/(mmol/L) | 3.60 (3.40,4.00) | 3.60 (3.40,4.00) | -0.960 | 0.934 |
| Sodium/(mmol/L) | 137.00 (135.00,139.00) | 137.00 (135.00,139.00) | -0.048 | 0.966 |
| Alanine Aminotransferase/(U/L) | 18.00 (13.00,30.00) | 18.00 (13.00,30.00) | -0.053 | 0.963 |
| Aspartate Aminotransferase/(U/L) | 23.00 (18.00,31.00) | 23.00 (18.00,31.00) | -0.108 | 0.926 |
| Alkaline Phosphatase/(U/L) | 64.00 (52.00,80.00) | 64.00 (52.00,80.00) | -0.200 | 0.986 |
| Total Bilirubin/(mg/dL) | 0.70 (0.50,1.00) | 0.70 (0.50,1.00) | -0.356 | 0.757 |
| Albumin/(g/dL) | 4.10 (3.80,4.30) | 4.10 (3.80,4.30) | -0.374 | 0.745 |
| Total Protein/(g/dL) | 6.90 (6.50,7.30) | 6.90 (6.50,7.30) | -0.142 | 0.902 |
| Calcium/(mg/dL) | 8.90 (8.60,9.30) | 8.90 (8.60,9.30) | -0.254 | 0.826 |
| Fibrinogen/(mg/dL) | 301.00 (263.00,357.00) | 301.00 (263.00,357.00) | -0.138 | 0.905 |
| Activated Partial Thromboplastin Time,seconds | 32.30 (29.60,34.70) | 31.70 (29.60,34.70) | -0.339 | 0.768 |
| International Normalized Ratio | 1.00 (0.95,1.09) | 1.00 (0.95,1.09) | -0.369 | 0.749 |
| Glucose/(mg/dL) | 110.00 (91.00,138.00) | 110.00 (91.00,132.00) | -0.184 | 0.873 |
| Lymphocyte Percentage | 28.70 (20.10,34.10) | 28.70 (22.10,34.10) | -1.378 | 0.228 |
| Neutrophil Percentage | 61.00 (53.10,67.50) | 58.60 (53.10,67.50) | -1.357 | 0.235 |
| Platelets/(×10³/μL) | 200.00 (166.00,258.00) | 211.00 (166.00,258.00) | -0.133 | 0.908 |
| Hematocrit | 35.20 (31.00,40.40) | 35.20 (31.00,40.40) | -0.009 | 0.994 |
| Hemoglobin/(g/dL) | 12.90 (11.30,14.20) | 12.90 (11.30,14.20) | -0.197 | 0.864 |
| White Blood Cells/(×10³/μL) | 6.30 (5.20,7.46) | 6.30 (5.20,7.46) | -0.041 | 0.972 |
| C-Reactive Protein/(mg/dL) | 0.11 (0.06,0.50) | 0.11 (0.06,0.50) | 0.500 | 0.663 |
| Lactate/(mmol/L) | 0.90 (0.60,1.40) | 0.90 (0.60,1.40) | 0.606 | 0.593 |
| Ionized Calcium/(mmol/L) | 1.10 (1.05,1.14) | 1.10 (1.06,1.15) | -3.566 | 0.002 |
| Oxygen Saturation | 99.00 (98.00,100.00) | 99.00 (98.00,100.00) | -1.403 | 0.222 |
| Bicarbonate/(mmol/L) | 25.80 (23.80,27.20) | 25.40 (23.80,27.20) | -0.422 | 0.714 |
| Arterial Blood Oxygen Pressure/mmHg | 165.00 (110.00,227.80) | 153.00 (110.00,209.00) | -1.984 | 0.084 |
| Arterial Blood Carbon Dioxide Pressure/mmHg | 38.00 (35.00,41.40) | 38.00 (35.00,41.40) | -0.436 | 0.704 |
| pH | 7.42 (7.39,7.46) | 7.42 (7.40,7.46) | -0.024 | 0.983 |
| Base Excess/(mmol/L) | 0.40 (-1.40,1.80) | 0.40 (-1.40,1.80) | -0.684 | 0.544 |
), ArticleFig(id=1322190354573542362, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=EN, label=Table 4, caption=
Comparisons of predictive performance of machine learning models for risk of respiratory failure
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| Training set |
|---|
| Models | AUC | ACC | Sensitivity | Specificity | PPV | NPV | F1 | Kappa | Brier |
| GBM | 0.946 | 0.883 | 0.791 | 0.942 | 0.897 | 0.877 | 0.840 | 0.749 | 0.104 |
| XGBoost | 1.000 | 0.999 | 0.998 | 1.000 | 1.000 | 0.998 | 0.999 | 0.998 | 0.008 |
| GLM | 0.784 | 0.714 | 0.435 | 0.891 | 0.718 | 0.713 | 0.542 | 0.352 | 0.184 |
| KNN | 0.900 | 0.809 | 0.774 | 0.831 | 0.744 | 0.853 | 0.759 | 0.601 | 0.123 |
| NB | 0.787 | 0.712 | 0.316 | 0.964 | 0.847 | 0.689 | 0.460 | 0.316 | 0.252 |
| NNET | 0.915 | 0.844 | 0.738 | 0.911 | 0.840 | 0.846 | 0.785 | 0.663 | 0.104 |
| SVM | 0.895 | 0.847 | 0.711 | 0.932 | 0.870 | 0.836 | 0.782 | 0.666 | 0.119 |
| RF | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 0.015 |
| Test set |
| Models | AUC | ACC | Sensitivity | Specificity | PPV | NPV | F1 | Kappa | Brier |
| GBM | 0.706 | 0.726 | 0.428 | 0.837 | 0.491 | 0.798 | 0.457 | 0.275 | 0.187 |
| XGBoost | 0.693 | 0.722 | 0.374 | 0.851 | 0.480 | 0.787 | 0.421 | 0.242 | 0.211 |
| GLM | 0.704 | 0.728 | 0.420 | 0.842 | 0.797 | 0.797 | 0.455 | 0.275 | 0.185 |
| KNN | 0.652 | 0.679 | 0.397 | 0.793 | 0.403 | 0.779 | 0.400 | 0.181 | 0.226 |
| NB | 0.700 | 0.757 | 0.344 | 0.910 | 0.584 | 0.790 | 0.433 | 0.291 | 0.205 |
| NNET | 0.700 | 0.712 | 0.481 | 0.797 | 0.467 | 0.806 | 0.474 | 0.275 | 0.223 |
| SVM | 0.705 | 0.733 | 0.481 | 0.825 | 0.504 | 0.812 | 0.492 | 0.311 | 0.186 |
| RF | 0.721 | 0.765 | 0.260 | 0.952 | 0.667 | 0.777 | 0.374 | 0.262 | 0.172 |
), ArticleFig(id=1322190354657428443, tenantId=1146029695717560320, journalId=1319373162502258839, articleId=1322190346147185568, language=CN, label=表4, caption=
呼吸衰竭风险预测模型结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| Training set |
|---|
| Models | AUC | ACC | Sensitivity | Specificity | PPV | NPV | F1 | Kappa | Brier |
| GBM | 0.946 | 0.883 | 0.791 | 0.942 | 0.897 | 0.877 | 0.840 | 0.749 | 0.104 |
| XGBoost | 1.000 | 0.999 | 0.998 | 1.000 | 1.000 | 0.998 | 0.999 | 0.998 | 0.008 |
| GLM | 0.784 | 0.714 | 0.435 | 0.891 | 0.718 | 0.713 | 0.542 | 0.352 | 0.184 |
| KNN | 0.900 | 0.809 | 0.774 | 0.831 | 0.744 | 0.853 | 0.759 | 0.601 | 0.123 |
| NB | 0.787 | 0.712 | 0.316 | 0.964 | 0.847 | 0.689 | 0.460 | 0.316 | 0.252 |
| NNET | 0.915 | 0.844 | 0.738 | 0.911 | 0.840 | 0.846 | 0.785 | 0.663 | 0.104 |
| SVM | 0.895 | 0.847 | 0.711 | 0.932 | 0.870 | 0.836 | 0.782 | 0.666 | 0.119 |
| RF | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 0.015 |
| Test set |
| Models | AUC | ACC | Sensitivity | Specificity | PPV | NPV | F1 | Kappa | Brier |
| GBM | 0.706 | 0.726 | 0.428 | 0.837 | 0.491 | 0.798 | 0.457 | 0.275 | 0.187 |
| XGBoost | 0.693 | 0.722 | 0.374 | 0.851 | 0.480 | 0.787 | 0.421 | 0.242 | 0.211 |
| GLM | 0.704 | 0.728 | 0.420 | 0.842 | 0.797 | 0.797 | 0.455 | 0.275 | 0.185 |
| KNN | 0.652 | 0.679 | 0.397 | 0.793 | 0.403 | 0.779 | 0.400 | 0.181 | 0.226 |
| NB | 0.700 | 0.757 | 0.344 | 0.910 | 0.584 | 0.790 | 0.433 | 0.291 | 0.205 |
| NNET | 0.700 | 0.712 | 0.481 | 0.797 | 0.467 | 0.806 | 0.474 | 0.275 | 0.223 |
| SVM | 0.705 | 0.733 | 0.481 | 0.825 | 0.504 | 0.812 | 0.492 | 0.311 | 0.186 |
| RF | 0.721 | 0.765 | 0.260 | 0.952 | 0.667 | 0.777 | 0.374 | 0.262 | 0.172 |
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