Prognostic Values of Serum Lactate-to-Bicarbonate Ratio and Lactate for Predicting 28-Day IN-Hospital Mortality in Children With Dengue Shock Syndrome

Authors

Thanh Nguyen Tat
Nhu Vo Hoang-Thien
Dat Nguyen Tat
Phuc Hoang Nguyen
Lien Thi Ho
Duong Hung Doan
Dung Tuan Phan
Yen Nguyen-Hoang Duong
Truc Huynh Nguyen
Tuyet Kim Nguyen
Ha Thi-Thu Dinh
Thuy Thi-Diem Dinh
Anh Thi-Mai Pham
Viet Do Chau
Tung Huu Trinh
Luan Vo Thanh

Publication Date

4-26-2024

Journal

Medicine

Abstract

This study aimed to assess the clinical utility of blood lactate-to-bicarbonate (L/B) ratio, as a prognostic factor for 28-day in-hospital mortality in children with dengue shock syndrome (DSS), admitted to the pediatric intensive care unit (PICU). This single-center retrospective study was conducted at a tertiary children hospital in southern Vietnam from 2013 to mid-2022. Prognostic models for DSS mortality were developed, using a predefined set of covariates in the first 24 hours of PICU admission. Area under the curves (AUCs), multivariable logistic and Least Absolute Shrinkage and Selection Operator (LASSO) regressions, bootstrapping and calibration slope were performed. A total of 492 children with DSS and complete clinical and biomarker data were included in the analysis, and 26 (5.3%) patients died. The predictive values for DSS mortality, regarding lactate showing AUC 0.876 (95% CI, 0.807-0.944), and that of L/B ratio 0.867 (95% CI, 0.80-0.934) (P values of both biomarkers < .001). The optimal cutoff point of the L/B ratio was 0.25, while that of lactate was 4.2 mmol/L. The multivariable model showed significant clinical predictors of DSS fatality including severe bleeding, cumulative amount of fluid infused and vasoactive-inotropic score (>30) in the first 24 hours of PICU admission. Combined with the identified clinical predictors, the L/B ratio yielded higher prognostic values (odds ratio [OR] = 8.66, 95% confidence interval [CI], 1.96-38.3; P < .01) than the lactate-based model (OR = 1.35, 95% CI, 1.15-1.58; P < .001). Both the L/B and lactate models showed similarly good performances. Considering that the L/B ratio has a better prognostic value than the lactate model, it may be considered a potential prognostic biomarker in clinical use for predicting 28-day mortality in PICU-admitted children with DSS.

Keywords

Humans, Male, Female, Retrospective Studies, Prognosis, Lactic Acid, Severe Dengue, Child, Hospital Mortality, Child, Preschool, Biomarkers, Bicarbonates, Intensive Care Units, Pediatric, Vietnam, Predictive Value of Tests, Infant, Area Under Curve