Artificial-intelligence-augmented clinical medicine
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1 Artificial-intelligence-augmented clinical medicine Klaus-Peter Adlassnig Section for Medical Expert and Knowledge-Based Systems Center for Medical Statistics, Informatics, and Intelligent Systems Medical University of Vienna Spitalgasse 23, A-1090 Vienna Einführung in Medizinische Informatik, WS 2014/15, 15. Oktober 2014
2 Artificial intelligence (AI) Definition 1: AI is a field of science and engineering concerned with the computational understanding of what is commonly called intelligent behavior, and with the creation of artifacts that exhibit such behavior. from: Shapiro, S.C. (1992) Artificial Intelligence. In Shapiro, S.C. (ed.) Encyclopedia of Artificial Intelligence, 2nd ed., vol. 1, Wiley, New York, Definition 2: AI is the science of artificial simulation of human thought processes with computers. from: Feigenbaum, E.A. & Feldman, J. (eds.) (1995) Computers & Thought. AAAI Press, Menlo Park, back cover.
3 Artificial intelligence applicable to clinical medicine It is the decomposition of an entire clinical thought process and its separate artificial simulation also of simple instances of clinical thought that make the task of AI in clinical medicine manageable. A functionally-driven science of AI that extends clinicians through computer systems step by step can immediately be established. artificial-intelligence-augmented clinical medicine
4 Computational intelligence in medical research medical knowledge definitional, causal, statistical, and heuristic knowledge facts consensus generalization molecular biomedicine evidence-based medicine medical studies biomolecular research medical statistics clustering and classification data and knowledge mining consensus conferences
5 Computational intelligence in patient care human-to-human patientphysician encounter AI-augmentation decision-oriented analysis and interpretation of patient data human-to-human patientphysician follow-up medical knowledge modules definitional, causal, statistical, and heuristic knowledge medical knowledge
6 Computers in clinical medicine steps of natural progression step 1: patient administration admission, transfer, discharge, and billing step 2: documentation of patients medical data electronic health record: all media, distributed, life-long (partially fulfilled) step 3: patient and hospital analytics data warehouses, quality measures, reporting and research databases, patient recruitment population-specific step 4: clinical decision support safety net, quality assurance, evidence-based patient-specific
7 Clinical medicine medication history symptomatic therapy history data patient symptoms signs laboratory test results biosignals images genetic data laboratory diagnosis radiological diagnosis symptoms signs test results findings differential diagnosis differential therapy prognosis patient medical guidelines examination subspecialities clinic
8 Clinical medicine medication history symptomatic therapy history data patient symptoms signs MYCIN laboratory laboratory test results diagnosis biosignalsanns QMR DxPlain symptoms CADIAG signs test results findings + differential diagnosis differential therapy prognosis patient images SVMs radiological diagnosis genetic data personalized medicine + medical guidelines examination subspecialities clinic
9 Clinical medicine: high complexity sources of medical knowledge definitional causal statistical heuristic layers of medical knowledge observational and measurement level interpretation, abstraction, aggregation, summation pathophysiological states diseases/diagnoses, therapies, prognoses, management decisions imprecision, uncertainty, and incompleteness imprecision (=fuzziness) of medical concepts * due to the unsharpness of boundaries of linguistic concepts uncertainty of medical conclusions * due to the uncertainty of the occurrence and co-occurrence of imprecise medical concepts incompleteness of medical data and medical theory * due to only partially known data and partially known explanations for medical phenomena gigantic amount of medical data and medical knowledge patient history, physical examination, laboratory test results, clinical findings symptom-disease relationships, disease-therapy relationships, terminologies, ontologies: SNOMED CT, LOINC, UMLS, specialization, teamwork, quality management, computer support
10 studies in Colorado and Utah and in New York (1997) errors in the delivery of health care leading to the death of as many as 98,000 US citizens annually causes of errors error or delay in diagnosis failure errors to employ indicated tests use of outmoded tests or therapy failure to act on results of testing or monitoring error in the performance of a test, procedure, or operation error in administering the treatment error in the dose or method of using a drug avoidable delay in treatment or in responding to an abnormal test inappropriate prevention (not indicated) care failure of communication equipment failure prevention of errors we must systematically design safety into processes of care
11
12 Medical information and knowledge-based systems patient s medical data medical statistics clustering & classification data & knowledge mining machine learning physician s medical knowledge symptoms signs test results clinical findings biosignals images diagnoses therapies nursing data standardization telecommunication chip cards information systems single patient many patients induction clinical decision support medical expert systems deduction general knowledge general knowledge diagnosis therapy prognosis management anatomy biochemistry physiology pathophysiology pathology nosology therapeutic knowledge disease management subjective experience intuition knowledge-based systems telemedicine integration telemedicine
13 Clinical decision support for patient safety and quality assurance patients structured medical data (HIS, LIS, PDMS, Web, documentation) diagnostic support alerts, reminders, to-do lists clinical interpretation, (tele)monitoring differential diagnostics rare diseases, rare syndromes further or redundant examinations diagnostic completeness (multi-morbidity) consensus-criteria-based evaluations disease classification and surveillance criteria prognostic prediction illness severity scores, prediction rules trend detection and visualization therapy advice drug alerts, reminders, calculations indication, contraindications, redundant medications, substitutions adverse drug events, interactions, dosage calculations, consequent orders management of antimicrobial therapies, resistance (open-loop) control systems hospital management and quality benchmarking evidence-based reminders and processes computerized clinical guidelines, protocols, SOPs healthcare-associated infection surveillance T highly-structured medical knowledge (rules, tables, trees, guidelines)
14 according to Kensaku Kawamoto, University of Utah, 2012: A Holy Grail of clinical informatics is scalable, interoperable clinical decision support. What have we done?
15 Interpretation of hepatitis serology test results
16 test results interpretation
17 ORBIS Experter: Hepatitis serology diagnostics
18 Interpretation of hepatitis serology test results
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20 Differentialdiagnose rheumatischer Erkrankungen
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22 Computergestützte Entwöhnung vom Respirator
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24 Personalized clinical decision support patient medical data history physical signs lab tests clinical findings + genomic data present (personalized) CDS future personalized CDS unavoidable, more specific diagnostics, extends the realm of therapy
25 Arden Syntax and Health Level Seven (HL7) A standard language for writing situation-action rules that can trigger alerts based on abnormal clinical events detected by a clinical information system. Each module, referred to as a medical logic module (MLM), contains sufficient knowledge to make a single decision. extended by packages of MLMs for complex clinical decision support The Health Level Seven Arden Syntax for Medical Logic Systems, Version 2.9 including fuzzy methodologies was approved by the American National Standards Institute (ANSI) and by Health Level Seven International (HL7) on 14 March 2013 Version 2.10 including ArdenML, an XML-based representation of Arden Syntax MLMs was approved on 6 May 2014 continuous development since 1989
26 General MLM Layout Maintenance Category Library Category Knowledge Category Resources Category Identify an MLM Data Types Operators Basic Operators Curly Braces List Operators Logical Operators Comparison Operators String Operators Arithmetic Operators Other Operators Control Statements Call/Write Statements and Trigger
27 Sample MLM (excerpt)
28 Arden Syntax server and software components Arden Syntax integrated development and test environment (IDE) including Medical logic module (MLM) editor and authoring tool Arden Syntax compiler (syntax versions 2.1, 2.5, 2.6, 2.7, 2.8, 2.9, and 2.10) Arden Syntax engine MLM test environment MLM export component command-line Arden Syntax compiler health care information system results reporting tools knowledge administration data Arden Syntax development & test environment knowledge Arden Syntax server 1) interfaces 2) data & knowledge services center 1) integrated, local, or remote 2) local and web services, web frontend knowledge results Arden Syntax data rule engine web-services-based Arden Syntax server including Arden Syntax engine MLM manager XML-protocol-based interfaces, e.g., SOAP, REST, and HL7 a project-specific data and knowledge services center may be hosted Java libraries Arden Syntax compiler Arden Syntax engine
29 Fuzzy Arden Syntax: Modelling uncertainty in medicine linguistic uncertainty due to the unsharpness (fuzziness) of boundaries of linguistic concepts; gradual transition from one concept to another modeled by fuzzy sets, e.g., fever, increased glucose level propositional uncertainty due to the uncertainty (or incompleteness) of medical conclusions; includes definitional and causal, statistical and subjective relationships modeled by truth values between zero and one, e.g., usually, almost confirming
30 Crisp sets vs. fuzzy sets χ Y young threshold age yes/no decision U = [0, 120] Y U with Y = {(χ Y (x)/ x) x U} χ Y : U {0, 1} χ Y (x) = 0 x > threshold 1 x threshold x U µ Y young threshold age gradual transition U = [0, 120] Y U with Y = {(µ Y (x)/ x) x U} µ Y : U [0, 1] 1 x > threshold µ 1 + (0.04 x) 2 Y (x) = x U 1 x threshold
31 Crisp sets vs. fuzzy sets χ Y young threshold age arbitrary yes/no decisions cause of unfruitful discussions often simply wrong µ Y young 1 intuitive gradual transitions 0 0 threshold age
32 Degree of compatibility [= degree of membership] µ A (x) 1.00 highly decreased decreased normal increased highly increased µ (x) = µ (x) = 0.18 µ (x) = 0.00 µ (x) = 0.00 µ (x) = x [mg/dl] glucose level in serum of 130 mg/dl
33 Clinical concepts and relationships between them truth value ( ) t S S S D 1 DoC 2 3
34
35
36 Integration into i.s.h.med at the Vienna General Hospital SOP checking in melanoma patients receiving chemotherapy
37 Towards a science of clinical medicine patient s medical data and healthcare processes for human processing patient s medical data and healthcare processes for machine processing observations measurements e.g., temperature chart e.g., CRP skin color (jaundice, livid, ) color measurement Measure what is measurable, and make measurable what is not so. Crucial point in clinical medicine: Digitize what is digitizable, and make digitizable what is not so. Galileo Galilei Klaus-Peter Adlassnig
38 The medical world becomes flat after Thomas L. Friedman The World is Flat. Penguin Books, in a local world decision support will be part of clinical information systems in a global world any activity where we can digitize and decompose the value chain*, and move the work around will get moved around * patient value chain: patient examination, diagnosis, therapy, prognosis, health care decisions, patient care
39 Future of artificial-intelligence-augmented clinical medicine today tomorrow predictable future medical data collection, storage, & distribution clinical decision support personalized medicine implants, prostheses, robotics HIS 1.0 HIS 2.0
40 Closing remark: formalism vs. reality Pure mathematics is much easier to understand, much simpler, than the messy real world! Gregory Chaitin (2005) Meta Math!: The Quest for Omega, Pantheon Books, New York. Clinical informatics deals with the messy real patient.
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