Machine learning for the NHS

June 2017

BrainFrom science fiction to the ward and into the IT department, Gareth Baxendale FBCS CITP explains why machine learning has the power to transform the NHS and the experiences of patients

‘It can only be attributable to human error...’ so said the HAL 9000 series computer from the movie 2001: A Space Odyssey. Of course, removing human error, where healthcare is concerned, would indeed be a remarkable achievement. A slightly more achievable goal, though, is to improve patient outcomes by augmenting clinical decision making with machine learning.

Given that NHS England engages with just over 500 patients a minute, it is obvious to many, that Machine Learning has a part to play in improving patient outcomes.

Meeting the machines

Machine Learning (ML) is a branch of the more commonly understood field of artificial intelligence (AI), the preserve of many Hollywood ‘rise-of-the-machines’ dystopian movie story lines. Simply put, artificial intelligence attempts to mimic human intelligence or behaviours while machine learning attempts to analyse, map and associate 'patterns' and 'behaviours' in multiple data sets to support intelligent, data-driven, decision making based on new knowledge and understanding.

This is of course an oversimplification of these complex disciplines, but the key focus of this article is: 'what can machine learning offer to the health sector?'

Meet the actors

There are varying platforms to choose from with products such as Google’s DeepMind, IBM’s Watson and Amazon’s Machine Learning which all offer a suite of tools, models and analytics augmented by cool sounding descriptors such as creating ‘Neural Networks’ and implementing ‘Deep Learning’.

Each differs in its approach, Google, for example, offers you access to open-source ‘hands-on’ software services like TensorFlow which provides a library for numerical computation using data flow graphs. Google uses TensorFlow for searching with their own Google Images and for predicting and creating auto-replies in Gmail.

Others, like Amazon’s Machine Learning, offer a more modular approach to guide you by making popular machine learning algorithms available to you, such as analysing customer feedback or recommending products on retail websites.

As always, the decision will be around how complex you need your computational models to be, and whether you have access to data scientists who can support the building and tailoring of the algorithms required. And behind the scenes you will find bespoke ASIC (Application Specific Integrated Circuit) hardware processing designed to accelerate Machine Learning routines.

Google’s Tensor Processing Unit (TPU)

What are the health opportunities for the NHS?

There are many areas where machine learning is already adding value. In the field of imaging and diagnostics, machine learning is being employed to search for patterns in images. Google's DeepMind Health is running a project with Moorfields Eye Hospital NHS Foundation Trust and University College London Hospitals NHS Foundation Trust to analyse images and surface potential areas of concern and to offer a course of action based on its learning.

‘Our algorithms interpret visual information in the form of de-personalised scans. The system is learning how to identify potential issues within these scans, and how to recommend the right course of action to a clinician’ - Google DeepMind Health

Optical Coherence Tomography scan

Streams is another machine learning solution from Google DeepMind Health and to quote: 'Streams is a secure instant alert app, addressing what clinicians call ‘failure to rescue’, when the right nurse or doctor doesn’t get to the right patient in time. Each year, many thousands of people in UK hospitals die preventably from conditions like sepsis and acute kidney injury, because the warning signs aren't picked up and acted on in time.'

While the trial is ongoing the current evidence suggest that Nurses are saving 2 hours per day and patients with serious diseases are being seen more quickly, which is promising news for patients.

IBM Watson is also using machine learning for a number of projects including Drug resistant Tuberculosis in South Africa by analysing drug susceptibility tests and TB genomes, each with 4.4 million base pairs. Another project is focused in the field of Neuroscience and is using images from multiple sources to find 'neuromarkers of emotion' that could improve Nurofeedback treatments.

Other key areas include the ability to predict treatments and assist with evidence-based medicine and reduce patient risk all based on Machine Learning using complex medical data.

Machine learning for clinical trials

Machine learning is also being used to assist in Clinical Trials. ScienceToday reports that Researchers at Cincinnati Children's Hospital Medical Center are using Machine Learning to figure out why people accept or decline invitations to participate in clinical trials. Recruiting sufficient numbers of participants is a current challenge in medical research that can compromise results or stop some studies altogether.

In the study, 60 percent of patients approached with traditional recruitment practices agreed to participate. Researchers are predicting that their new automated algorithm could push acceptance levels up to about 72 percent.

Machine learning and NHS cyber security?

Machine learning could also be used to improve NHS cyber security. Vendors such as Alert Logic are now turning to machine learning algorithms to detect security anomalies. Machine learning can potentially ‘defend at scale’ by allowing a system to learn, and adapt to unusual activity on a national, or global scale, based on previous learnings and patterns of expected behaviour. The real value, as with all machine learning projects, is to discover ‘new knowledge’, in this case it could be a new type of malware or ransomware attack.

However, this is still a maturing area with limitations. Interviewing security researchers one recent report notes that ‘there are too many high false positive rates, too much reliance on humans to make security decisions, slower security operations and ‘easy for attackers to bypass.’ (Carbon Black the.report May 2017). Clearly there is still work to be done before such machine learning based security tools are used without additional security layers, and humans supervising.

‘At least for the next five years, a battle of ‘human vs. human,’ where AI and ML can be used to augment and empower human reasoning, not replace it’ - Carbon Black the.report May 2017

While the HAL 9000 computer professed to be ‘by any practical definition of the words, fool proof and incapable of error’ it will still be some time before humans would take an ‘unsupervised’ approach to decision making based on machine learning. However, there is no doubt that Machine Learning is already beginning to offer real-world value. It's almost certain, that in the near future, all medical diagnostics, monitoring and treatment plans will, in-part, come from knowledge derived from, and recommended by, machine learning platforms.

Image: istock/akindo, Google

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