ohca-classifier-v8

OHCA Classifier v8 — PubMedBERT fine-tuned for cardiac arrest detection

Author: Mona Moukaddem
Model: monajm36/ohca-classifier-v8
Task: Binary text classification — Out-of-Hospital Cardiac Arrest (OHCA) vs Non-OHCA
Base model: microsoft/BiomedNLP-PubMedBERT-base-uncased-abstract

This model predicts whether a discharge note likely describes out-of-hospital cardiac arrest (OHCA).
It was fine-tuned from PubMedBERT on MIMIC-derived discharge notes using patient-level splits to prevent leakage.

⚠️ For research and decision support only. Not a substitute for clinical judgment.

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How to use

from transformers import AutoTokenizer, AutoModelForSequenceClassification
import torch

model_id = "monajm36/ohca-classifier-v8"
tokenizer = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForSequenceClassification.from_pretrained(model_id)

text = """Chief Complaint: cardiac arrest
History of Present Illness: Patient found unresponsive at home... ROSC after EMS CPR..."""

inputs = tokenizer(text, return_tensors="pt", truncation=True, padding=True, max_length=512)
with torch.no_grad():
    logits = model(**inputs).logits
probs = torch.softmax(logits, dim=-1).squeeze()
print(probs)
Threshold recommendations
Clinical Goal	Threshold	Behavior
High Sensitivity	0.28–0.32	Captures nearly all OHCA cases
Balanced	0.36	Validation-optimized
High Precision	≥0.50	Fewer false positives

At 0.36, validation yielded:

Sensitivity (Recall): 1.000

Specificity: 0.879

AUC: 0.971

Data & Training Summary
Source: MIMIC-derived discharge notes

Sections used: Chief Complaint, History of Present Illness

Splits: Train 210, Val 54, Test 66 (patient-level)

Max length: 512 tokens

Epochs: 5

Loss: Weighted cross-entropy

Sampler: Class-balanced

Hardware: CPU

Evaluation (Test Set)
Pred Non-OHCA	Pred OHCA
Actual Non	51	7
Actual OHCA	0	9

Metrics:

Recall: 1.000

Specificity: 0.879

Precision: 0.562

NPV: 1.000

F1-score: 0.720

AUC: 0.971

Interpretation: The model captured all OHCA cases at the chosen threshold, with 7 false positives.

License
MIT

Citation
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M. Moukaddem. OHCA Classifier v8: PubMedBERT fine-tuned for Out-of-Hospital Cardiac Arrest