Healthcare NLP v2.7.2 Release Notes

Named Entity Recognizers for Medications

• A new medication NER (ner_drugs_greedy) that joins the drug entities with neighboring entities such as dosage, route, form and strength; and returns a single entity drug. This greedy NER model would be highly useful if you want to extract a drug with its context and then use it to get a RxNorm code (drugs may get different RxNorm codes based on the dosage and strength information).

Metrics

• A new medication NER (ner_posology_greedy) that joins the drug entities with neighboring entities such as dosage, route, form and strength. It also returns all the other medication entities even if not related to (or joined with) a drug.

Now we have five different medication-related NER models. You can see the outputs from each model below:

Text = ‘‘The patient was prescribed 1 capsule of Advil 10 mg for 5 days and magnesium hydroxide 100mg/1ml suspension PO. He was seen by the endocrinology service and she was discharged on 40 units of insulin glargine at night, 12 units of insulin lispro with meals, and metformin 1000 mg two times a day.’’

a. ner_drugs_greedy

b. ner_posology_greedy

c. ner_drugs

d.ner_posology

e. ner_drugs_large

Patient Gender Classification

This model detects the gender of the patient in the clinical document. It can classify the documents into Female, Male and Unknown.

We release two models:

• ‘Classifierdl_gender_sbert’ (more accurate, works with licensed sbiobert_base_cased_mli)

• ‘Classifierdl_gender_biobert’ (works with biobert_pubmed_base_cased)

The models are trained on more than four thousands clinical documents (radiology reports, pathology reports, clinical visits etc.), annotated internally.

Metrics (Classifierdl_gender_sbert)

Text= ‘‘social history: shows that does not smoke cigarettes or drink alcohol, lives in a nursing home. family history: shows a family history of breast cancer.’’

gender_classifier.annotate(text)['class'][0]
>> `Female`

See this Colab notebook for further details.

a. classifierdl_gender_sbert

document = DocumentAssembler()\
    .setInputCol("text")\
    .setOutputCol("document")

sbert_embedder = BertSentenceEmbeddings\
    .pretrained("sbiobert_base_cased_mli", 'en', 'clinical/models')\
    .setInputCols(["document"])\
    .setOutputCol("sentence_embeddings")\
    .setMaxSentenceLength(512)

gender_classifier = ClassifierDLModel\
    .pretrained('classifierdl_gender_sbert', 'en', 'clinical/models') \
    .setInputCols(["document", "sentence_embeddings"]) \
    .setOutputCol("class")

gender_pred_pipeline = Pipeline(
    stages = [
       document,
       sbert_embedder,
       gender_classifier
            ])

b. classifierdl_gender_biobert

documentAssembler = DocumentAssembler()\
    .setInputCol("text")\
    .setOutputCol("document")

clf_tokenizer = Tokenizer()\
    .setInputCols(["document"])\
    .setOutputCol("token")\

biobert_embeddings = BertEmbeddings().pretrained('biobert_pubmed_base_cased') \
    .setInputCols(["document",'token'])\
    .setOutputCol("bert_embeddings")

biobert_embeddings_avg = SentenceEmbeddings() \
    .setInputCols(["document", "bert_embeddings"]) \
    .setOutputCol("sentence_bert_embeddings") \
    .setPoolingStrategy("AVERAGE")

genderClassifier = ClassifierDLModel.pretrained('classifierdl_gender_biobert', 'en', 'clinical/models') \
    .setInputCols(["document", "sentence_bert_embeddings"]) \
    .setOutputCol("gender")

gender_pred_pipeline = Pipeline(
   stages = [
       documentAssembler,
       clf_tokenizer,
       biobert_embeddings,
       biobert_embeddings_avg,
       genderClassifier
   ])

New ICD10CM and RxCUI resolvers powered by s-Bert embeddings

The advent of s-Bert sentence embeddings changed the landscape of Clinical Entity Resolvers completely in Spark NLP. Since s-Bert is already tuned on MedNLI (medical natural language inference) dataset, it is now capable of populating the chunk embeddings in a more precise way than before.

We now release two new resolvers:

• sbiobertresolve_icd10cm_augmented (augmented with synonyms, four times richer than previous resolver accuracy:

  73% for top-1 (exact match), 89% for top-5 (previous accuracy was 59% and 64% respectively)

• sbiobertresolve_rxcui (extract RxNorm concept unique identifiers to map with ATC or durg families) accuracy:

  71% for top-1 (exact match), 72% for top-5 (previous accuracy was 22% and 41% respectively)

a. ICD10CM augmented resolver

Text = “This is an 82 year old male with a history of prior tobacco use , hypertension , chronic renal insufficiency , COPD , gastritis , and TIA who initially presented to Braintree with a non-ST elevation MI and Guaiac positive stools , transferred to St . Margaret's Center for Women & Infants for cardiac catheterization with PTCA to mid LAD lesion complicated by hypotension and bradycardia requiring Atropine , IV fluids and transient dopamine possibly secondary to vagal reaction , subsequently transferred to CCU for close monitoring , hemodynamically stable at the time of admission to the CCU . “

b. RxCUI resolver

Text= “He was seen by the endocrinology service and she was discharged on 50 mg of eltrombopag oral at night, 5 mg amlodipine with meals, and metformin 1000 mg two times a day . “

Using this new resolver and some other resources like Snomed Resolver, RxTerm, MESHPA and ATC dictionary, you can link the drugs to the pharmacological actions (PA), ingredients and the disease treated with that.

Code sample:

(after getting the chunk from ChunkConverter)

c2doc = Chunk2Doc().setInputCols("ner_chunk").setOutputCol("ner_chunk_doc")

sbert_embedder = BertSentenceEmbeddings\
    .pretrained("sbiobert_base_cased_mli",'en','clinical/models')\
    .setInputCols(["ner_chunk_doc"])\
    .setOutputCol("sbert_embeddings")

icd10_resolver = SentenceEntityResolverModel.pretrained("sbiobertresolve_icd10cm_augmented","en", "clinical/models") \
    .setInputCols(["sbert_embeddings"]) \
    .setOutputCol("icd10cm_code")\
    .setDistanceFunction("EUCLIDEAN")

See the notebook for details.