The National Diabetes Foot Care Audit (NDFA) was launched in July 2014 and is ongoing. It is part of the family of audits linked to the parent National Diabetes Audit which holds anonymised data on over 98% of all people diagnosed with diabetes in England and Wales. The objective of the NDFA was (and is) to enable specialist services in England and Wales to document as many as possible of all diabetic foot ulcers (DFUs) in a way that permits comparison. In this respect, the term ‘specialist services’ (Box 1) includes any professional service that adopts responsibility for the management of the ulcer — whether community or hospital based. The hope is that the NDFA will promote better understanding of the causes of the very wide variation in clinical outcomes that exists between different localities and between different service providers (NHS Digital, 2019). The aim is that this will lead to reduced variation in clinical outcomes and improved overall outcome across the two countries.
What has been achieved so far?
Registered ulcer episodes
The number of new ulcer episodes registered within any 12-month period from April 1 has increased year on year and a total of 33,155 ulcer episodes were registered in 27,700 people in the 3 years from 2015 and 2018. Over 15,000 episodes are currently being recorded each year and although the total number of new ulcers occurring annually throughout England and Wales is not known, it is thought that this represents at least 20% of the total (NHS Digital, 2019). If this percentage seems relatively low, the total number of episodes documented by the NDFA is far greater than any other population of DFUs followed prospectively from the time of presentation.
Moreover, the NDFA does not record every new ulcer but only those occurring in a person who did not have another active foot ulcer already. Similarly, when multiple new ulcers present together, the NDFA will select only one — that judged clinically to be the most significant — for each new episode. Another reason for the apparently low ascertainment is that the data submitted to the NDFA is almost exclusively from staff working in specialist services and it is known that only a minority of DFUs are referred to such services by clinicians working in primary care (Guest et al, 2018). For these reasons, the actual percentage of new DFU episodes being recorded by the NDFA is likely to be reasonably representative of referrals to specialist services.
Details from three completed years of data collection and follow-up have recently been reported for April 2015–March 2018 (NHS Digital, 2019) and these have established that there is:
- A statistically significant direct relationship between the time that elapses between first presentation to any healthcare professional and being assessed by a specialist clinician and its severity at presentation: the longer the time to expert assessment, the more likely it is to be judged ‘severe’ using the SINBAD classification (Ince et al, 2008)
- A strong statistical relationship between time to first assessment and the primary clinical outcome — which is being alive and free from any ulcer (including related operation wounds such as for debridement, revascularisation or amputation) at 12 weeks (Figure 1). Ulcers that are more severe at presentation are less likely to be healed
- A significant link between time to referral, severity at first assessment and other clinical outcomes: hospital admission, hospital length of stay, incidence of major amputation within 6 months and death (NHS Digital, 2019).
Observations and conclusions
Perhaps the greatest benefit derived from the observations made to date is improved understanding of the multiple factors involved and the extent of the variation that exists in service provision. As a result, it is now possible to share this information with other professionals, with patients and their representatives, as well as with those responsible for commissioning clinical care. This has been associated with evolution of a new culture in podiatry services based on greater understanding of how multiple factors that contribute to clinical outcomes and raised awareness of how services can be re-designed to achieve the best outcomes.
Variation in outcome between localities
The NDFA has also shown that when different localities are compared, there is very wide variation in the average time that elapses between first presentation to any healthcare professional and first expert assessment (Figure 2). The implication is that there are important differences in referral pathways and it follows that if these can be identified and optimised, variation will be reduced and outcomes improved.
Aims for 2019-2020 and 2020-2021
There will be no NDFA annual report this year because it has not been commissioned. Nevertheless, it is important that teams continue to record data on as many as possible of all new referrals in order both to strengthen analyses to be performed in late 2020 and in 2021, as well as to help them monitor local trends. The aim of future analyses will be to gain further insight into those aspects of the care pathway which are most closely linked to clinical outcomes. It will be possible to start examining changes that occur as time passes — changes in ulcer severity, for example, and trends towards earlier expert assessment and improving overall outcomes.
Links between outcome and details of care structure and delivery
The key features of good care delivery will be determined from a number of sources including the NDFA data already collected, the results of a survey conducted in 2018 of the structure of the care pathway used by 10 best-performing centres (NHS Digital, 2019), and work currently being undertaken by representatives of 12 further services which have been working as part of a HQIP Quality Improvement Collaborative undertaken in partnership with Diabetes UK. Once these key features are defined, a survey of provider services will seek to establish links between clinical outcomes and the structures of local care.
Changes to data collection to be implemented from April 1, 2020
As a result of greater understanding of data requirements the record form will be modified in 2020. Questions relating to ulcers being associated with Charcot disease will be omitted and one new question will also be included which asks if a newly presenting ulcer is or is not the first ulcer (on either foot) that that person has ever had. It is now recognised that it is essential that we distinguish between ‘first ever’ and ‘not first ever’ ulcers because available evidence suggests that people with recurrent ulcers present sooner to specialist services — often because they know the specialist staff and find it easy to contact them directly to organise an early review.
NHS Digital has also now introduced a facility for bulk data upload and this will help reduce the time taken.
Benefits for centres that take part
The portal through which local data is submitted to the NDFA (the Clinical Audit Platform or CAP) can also be used by individual centres to download details of their own population and outcomes, this can be used to monitor the success of any changes they make to pathways of care. It is hoped that increased use of these resources will help services better understand the effects of changes introduced to improve the quality of care they deliver.
Continuing challenges faced by the NDFA
The main challenge is to continue increasing the participation of specialist services. The larger the population documented, the more robust will be the statistical analyses and this will allow better benchmarking and will help define the reasons for better or worse outcomes in different localities.