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[ICU Management & Practice]: 重癥醫(yī)學(xué)的再思考:人工智能的應(yīng)用與挑戰(zhàn)
22.11.08

[ICU Management & Practice]: 重癥醫(yī)學(xué)的再思考:人工智能的應(yīng)用與挑戰(zhàn)(圖1)

ICU Management & Practice, Volume 21 - Issue 1, 2021

Rethinking Critical Care - Use and Challenges of Artificial Intelligence

Why digitalisation of intensive care medicine means less rather than more data

Intensive Care Medicine is generating an amount of data that is hardly analysable by humans. Digitalising and using artificial intelligence has to focus on providing less rather than more data.


Introduction - AI in Intensive Care Medicine: Ghost or Glimmer of Hope?

Whether it's flying robots buzzing around the patient's bed or glowing beams that miraculously heal people in seconds: we are currently a long way from such science fiction scenarios in medicine - Good thing.


But the use of artificial intelligence (AI) in medicine is not a mysterium, and it certainly must not become one. After all, AI is not an autonomously acting black box over which we no longer have any influence and whose actions we humans can no longer comprehend. What many people are currently forgetting: every AI-based algorithm is always based on human intelligence. Everything that an AI does is developed and implemented by us humans. Only with highly complex deep learning do algorithms begin to independently recognise new patterns in the data sets and thus develop something like an apparent intelligence (Peine 2020). The machines therefore still have a long way to go before they have a life or even a will of their own.


No other area in a hospital is more influenced by the omnipresence of high-tech devices, then today’s intensive care units. Compared to other medical specialties there might be no other field where critically ill patients are such depended from organ support by machines and where their vitals are so frequently and continuously monitored. Thus, critically ill patients often generate data volumes that – in all dimensions - are not analysable by human brains (Johnson 2016).


Up to ten devices surround each patient bed in order to monitor all relevant parameters. This is actually quite a comfortable situation for us - if it weren't for the enormous volumes of data that have to be sifted through, documented and evaluated by far too few specialists at the same time. If we don't take countermeasures now, the system will inevitably collapse.


Patient data on an intensive care unit (ICU) are recorded in different resolutions or time intervals, depending on the urgency and implication (Table 1). Digital, electronic health records (EHR) are thus inconceivable in modern ICU treatment. At the same time, EHRs are creating pre-determined value for the use of big data, often linking all further incoming source systems like radiological, microbiological or laboratory findings, medication or other examination. EHRs bundle all relevant data and are particular sources for big data analysis. Nowadays, we aggregate over 1,000 data points per patient in a single hour on the wards (Cleophas 2015). If a physician cares for between 14 and 20 patients daily, there are between 14,000 and 20,000 data points that he or she would have to look at. This is a volume of work that almost no one can keep an overview of - this inevitably results in errors that can cost lives. This density of data will not decrease in the future. In fact, it is increasing by 30% per year, which intensive care physicians have to evaluate additionally. Like in an airplane cockpit, doctors try to keep the flood of data under control - sometimes with up to six screens simultaneously, on which new data appear every second. As a result, we have to spend an incredible amount of time preparing and interpreting this mass of data and recording it in accordance with general documentation requirements. The time that has to be invested in this could be used far more sensibly.

[ICU Management & Practice]: 重癥醫(yī)學(xué)的再思考:人工智能的應(yīng)用與挑戰(zhàn)(圖2)

To give you a better idea, consider the following comparison: if you're traveling at 200 km/h on a busy highway, you'll certainly be pleased with the numerous assistance systems that work for the driver in her or his own car. Even if these systems - apart from autonomous driving - are active and support the person behind the wheel, for example in keeping in lane, he or she still has the steering wheel in his or her own hands and can intervene at any time. So it's not about replacing the driver, but about cooperative assistance. With cars that are traveling so fast that the human eye can no longer perceive some things, we gladly accept this assistance. So why are there still many reservations from the medical field?


Availability of Intensive Care Datasets

In particular, the publication of two medical databases, the Medical Information Mart for Intensive Care III database (MIMIC-III) (Johnson 2016), consisting of data from 61,532 ICU patients from Beth Israel Deaconess Medical Center (USA), and the eICU Collaborative Research Database v2.0 (eICU) (Pollard 2018), consisting of data from 200,859 ICU patients from over 300 ICUs in the USA, has led to a democratisation of research in the field of big data in intensive care medicine. Recently, a European equivalent, the "Amsterdam UMCdb," with associated data from 20,181 ICU patients has also been published. With this retrospective data, scientists can now train AI systems without access to proprietary hospital data and any associated data privacy concerns.


Explainability and Transparency are Crucial

The complexity of algorithms means that a profound and detailed knowledge is needed to really understand them. That, in turn, would be the normal prerequisite for gaining acceptance for a new technology or product in medicine: Explain, Understand, Deploy. So how can it be ensured at all that a system actually fulfills the ethical principles for AI, such as being non-discriminatory, beneficial, autonomous and fair, if it cannot even be explained which factors and processing procedures underlie the result of an AI system?


Explainability therefore means both understandability and accountability. When medical decisions are supplemented and, in some cases, even overridden by AI-based algorithms, human experts should still have the possibility and ability to understand and explain the process of machine decision-making, at least upon request. An essential criterion of explainable artificial intelligence - especially in medicine - therefore remains causality as well as the measurement of the quality of explainability. Based on these premises, the challenge is to provide insight into why neural networks and other machine learning algorithms make their decisions (Wachter 2017) and how models that can be interpreted by humans can be developed and optimised (Stewart 2018). The aim has to be to generate adequate explanations for the decisions made (FDA 2020). The European Commission has also recently taken a position on this topic in a white paper (European Commission 2021).


Intensive Care Units: What to do Now?

To cut to the chase: if we want to maintain our high-quality care in critical care, we need to act now! Critical care needs a work environment where medical staff is not spending 50% of their work time in front of a computer. Meaningful mechanisms and powerful tools are needed - coupled with algorithms that help ensure we can focus on the essential data. In the future, we will need support systems that are technologically mature and help us provide evidence-based therapy at every moment. Telemedicine solutions bring specialist expertise to our patients' bedsides - both in the big city and in the countryside.


Clinical Decision Support Systems (CDSS)

Evidently, sepsis/septic shock and the acute respiratory distress syndrome are the most relevant fatal entities in the ICU (SepNet Critical Care Trials Group 2016; Phua 2009), with mortality rates up to 50%. Both syndromes have in common that early diagnosis and adequate, guideline-adhered treatment is urgently demanded. However, particularly regarding early diagnosis, ICU physicians are often confronted with patients being transferred from home to ambulatory care to the ED and finally to the ICU. This is often time consuming and may aggravate patients` outcome due to delayed treatment.


Besides, in ARDS, nearly 40% of the cases are not even diagnosed by physicians, which suggests procedural and infrastructural deficits (Bellani 2016). Digital use and the approach of pre-processing data from EHRs respectively, could be a meaningful solution (Peine 2021). As kind of a medical decision support, a mobile device could draw attention to the relevant diagnosis of ARDS by providing diagnostic data and treatment recommendations from the EHR to a smartphone app (or other mobile devices). The use case ‘Algorithmic Surveillance of ICU patients with acute respiratory distress syndrome’ (ASIC) follows this strategy within a quality improvement project and is an integral part of the ‘Smart Medical Information Technology for Healthcare’ (SMITH) project (Winter 2018). It is the aim of this project to improve ARDS detection and guideline adherence in the treatment of mechanically ventilated ARDS-patients by implementing an application software (app) provided on a mobile device and consecutively improve outcome in this patient population (Figure 1). The data used by the ASIC app is obtained from the local EHR. Further, the ASIC app operates system-independently on different devices; however, it is primarily intended to be used on a mobile device (e.g. tablet, smartphone). All in all, this app use is only one clinical example for upcoming, diverse clinical considerations, giving physicians the opportunity to


timely keep vital data under control

make adequate diagnosis

adhere to guidelines.

[ICU Management & Practice]: 重癥醫(yī)學(xué)的再思考:人工智能的應(yīng)用與挑戰(zhàn)(圖3)

Moreover, app use can be a relevant interlink to bundle data from the EHR and to transfer them for the purpose of AI research. Ideally, an intersectoral infrastructure will lead to interoperability for comparing big data on a higher level and for building data bases in analogy to MIMIC-III.


Conflict of Interest

LM, AP, and GM are co-founders of Clinomic GmbH. LM and AP are chief executive officers of Clinomic GmbH. GM received restricted research grants and consultancy fees from BBraun Melsungen, Biotest, Adrenomed, and Sphingotec GmbH outside of the submitted work. LM rand AP received consultancy fees from Sphingotec GmbH. JB received consultancy fees from Bayer and Biotest.


References:

Amsterdam Medical Data Science. Available from amsterdammedicaldatascience.nl/


Bellani G, Laffey JG, Pham T et al. (2016) Epidemiology, Patterns of Care, and Mortality for Patients With Acute Respiratory Distress Syndrome in Intensive Care Units in 50 Countries. JAMA, 315(8):788-800.


Cleophas TJ, Zwinderman AH (2015) Machine Learning in Medicine – a Complete Overview. Springer 2015.


Health C for D and R: Artificial Intelligence and Machine Learning in Software as a Medical Device. (2020) FDA. Available from fda.gov/medical-devices/ software-medical-device-samd/artificial- intelligence-and-machine-learning- software-medical-device


Johnson AEW, Pollard TJ, Shen L et al (2016) MIMIC-III, a freely accessible critical care database. Sci Data, 3:160035.


Peine A, Lütge C, Poszler F et al. (2020) Celi L, Sch?ffski O, Marx G et al: Künstliche Intelligenz und maschinelles Lernen in der intensivmedizinischen Forschung und klinischen Anwendung. An?sth Intensiv med., 61:372–384. DOI: 10.19224/ai2020.372


Peine A, Hallawa A, Bickenbach J et al. Development and Validation of a Reinforcement Learning Algorithm to Dynamically Optimize Mechanical Ventilation in Critical Care. NPJ Digital Medicine. Accepted ahead of print.


Phua J, Badia JR, Adhikari NKJ et al. (2009) Has mortality from acute respiratory distress syndrome decreased over time?: a systematic review. Am J Respir Crit Care Med., 179: 220-227.


Pollard TJ, Johnson AEW, Raffa JD et al. (2018) The eICU Collaborative Research Database, a freely available multi-center database for critical care research. Sci Data, 5:180178


SepNet Critical Care Trials Group. Incidence of severe sepsis and septic shock in German intensive care units: the prospective, multicentre INSEP study. (2016) Intensive Care Med., 42(12):1980-1989


Stewart J, Sprivulis P, Dwivedi G (2018) Artificial intelligence and machine learning in emergency medicine. Emerg Med Australas., 30:870–874


Wachter S, Mittelstadt B, Floridi L (2017) Transparent, explainable, and account- able AI for robotics. Sci Robot. Available from ora.ox.ac.uk/objects/uuid: fd0a0307-dc89-488e-bdec-4a100d- 1f073e


White Paper on Artificial Intelligence: a European approach to excellence and trust. European Commission. Available from ec.europa.eu/digital-single-market/en/artificial-intelligence


Winter A, Staubert S, Ammon D et al. (2018) Smart Medical Information Technology for Healthcare (SMITH). Methods Inf Med., 57(S 01):e92-e105.



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