Can AI forecast ICU risk from the first 36 hours of EHR data?
University of Washington researcher Sihan explains TrajSurv, a survival-prediction model that converts noisy, irregular ICU time series into interpretable latent trajectories using Neural Controlled Differential Equations (NCDEs) and time-aware contrastive learning aligned to SOFA. We cover how trajectories outperform snapshots, handle missingness without heavy imputation, and remain clinically legible via vector-field feature importance and trajectory clustering.
Validated on MIMIC-III and eICU with reported C-index ≈0.80 and cross-cohort ≈0.76, TrajSurv points to safer escalation, de-escalation, and bed allocation in the ICU.
In this episode: survival prediction basics; limits of Cox/RSF vs deep time-series models; NCDE explained in plain language; first-36h feature set (53 labs/vitals/demographics); metrics (C-index, Brier, dynamic AUC); interpretable clustering linked to outcomes; and what’s next—adding interventions for counterfactual simulation and extending to oncology.
Link to the paper: https://arxiv.org/abs/2508.00657
Timestamps
00:00 Why trajectories beat snapshots in EHR
01:00 Guest intro: Sihan, UW Biomedical Informatics
01:40 Survival prediction 101 and clinical use
03:40 From Cox/RSF to deep learning on time-varying data
05:03 What is TrajSurv (pronounced “traj-surf”)?
06:16 NCDE explained with the “ship + weather” analogy
08:14 Handling irregular sampling and missing data
09:14 Time-aware contrastive learning aligned to SOFA
10:47 Datasets: MIMIC-III and eICU; first 36h features (labs, vitals, demo)
12:40 Results: C-index ≈0.80; cross-cohort ≈0.76; interpretability
14:30 Workflow: CDS, monitoring, escalation, de-escalation
16:15 Why humans miss multi-variable long-horizon trends
18:21 Latent trajectory clustering and survival differences
23:18 Next: interventions, counterfactuals, oncology applications
25:40 Closing
Roupen Odabashian LinkedIn: https://www.linkedin.com/in/roupen-odabashian-md-frcpc-abim-183aaa142/
Sihang Zeng: https://www.linkedin.com/in/zengsh/
#HealthcareAI #ClinicalDecisionSupport #EHR #ICU #SurvivalAnalysis #DeepLearning #NCDE #MIMICIII #eICU #SOFA
