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56 D. Dixon and M. Edmonds
Near Infrared (NIR) Optical Imaging
The use of near infrared (NIR) optical imaging to map haemodynamic changes in diabetic foot ulcers has been an area of interest. The technology is non-invasive and non-ionizing and requires no contact. It utilises near infrared light between 650 and 1000 nm which is minimally absorbed and allows deep tissue imaging (Kaile and Godavarty 2019). NIR has been used as an adjunct to improving surgical debridement techniques by quantifying the level of tissue oxygenation around areas of callus after debridement. This was reported from a small multi-centre trial between Florida and India, to show a greater than 80% change in tissue oxygenation following debridement (Kaile et al. 2021). Development of smart phone technology using NIR to aid with non-contact 2D and 3D wound image analysis is still in the early stages, but is currently being used in a different modality (contact) to aid with skin cancer assessment and brain imaging (Kaile and Godavarty 2019).
Innovative Technology in Wound Applications to Accelerate Healing
Historically, there has been a scarcity of evidence-based topical therapy to accel­erate the healing of diabetic foot ulcers In 2019, the IWGDF made several rec­ommendations (Rayman et al. 2020). It advised that practitioners consider the use of the sucrose-octasulfate impregnated dressing in non-infected, neuro-ischaemic diabetic foot ulcers that are difcult to heal despite best standard of care, following on from the Explorer study which reported the benet of sucrose octasulphate dressing when applied to ulcers in neuroischaemic feet (Edmonds et al. 2018). The use of LeucoPatch was also recommended as he LeucoPatch study had reported the benet of a multi-layered patch comprising autologous leucocytes, platelets, and brin, which releases cytokines and growth factors involved in tissue repair, in a multinational, observer blinded, randomised, controlled trial (Game et al. 2018). The IWGDF also recommended the use of placental derived products as an adjunctive treatment in addition to best standard of care, when the latter alone has failed to reduce the size of the wound (Tettelbach et al. 2019). Recommendations were also made by the IWGDF to consider the use of systemic hyperbaric oxygen therapy as an adjunctive treatment in non-healing ischaemic diabetic foot ulcers despite best standard of care, and the use of negative pressure wound therapy (NWPT) to reduce wound size, in addition to best standard of care, in patients with diabetes and a post-operative (surgical) wound on the foot. In one well-designed RCT, Armstrong and Lavery (2005) compared NPWT to standard moist wound care in 162 people with diabetes who had partial foot amputations up to the transmetatarsal level. They found a healing rate at 16 weeks of 56% compared to 39% in the standard care group. A systematic review and meta-analysis performed by Liu et al. ( from 11 RCTs involving 1,044 patients concluded that NPWT was 1.48 times more likely than conventional dressings to heal wounds, with a decreased time to closure (by 8 days) and a reduced risk of amputation (relative risk 0.31). Three RCTs have
2017)
also compared NPWT to conventional dressings. This analysis
The Diabetic Foot, Its Complications, Role of Technology 57
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compared conventional NPWT to NPWT with saline instillation. Lavery et al. showed no difference in a study of 150 patients (Lavery et al. 2020). However, Giri et al. reported a decreased bacterial burden and decreased wound size in 48 patients (Giri et al. 2021). Kim et al. found no differences in their primary endpoints but did demonstrate a 3.1-fold decrease in readmission of patients treated with saline instillation and NPWT compared to NPWT alone (Kim et al.
2020; Boulton et al.
2022). Although previous studies have been criticized as providing low-certainty
evidence from trials with risk of bias and imprecision, NWPT has become standard treatment of complex diabetic foot ulcers (Boulton et al. 2022). Overall, there is evidence that this form of therapy increases granulation tissue, and prospective RCTs have shown that it accelerates wound healing.
Recently there has been new evidence to support the technology for topical oxygen therapy (TOT). There are three general types of delivery systems for TOT, each of which allows for ambulatory or home-based treatment: (1) those generating continuous delivery of oxygen (CDO) at negligible pressures, (2) low constant pressure delivery in a contained chamber, and (3) higher cyclically pressurized and humidied delivery in a contained extremity chamber (Boulton et al. 2022). Using the cyclically pressurized topical wound oxygen device for healing recalcitrant diabetic foot ulcers, a robust multicentre, sham-controlled, double-blinded RCT was reported in 2020 (Frykberg et al. 2020). At the rst planned (a priori) interim analysis point, the active therapy was found to be superior to the sham, with a closure rate at 12 weeks of 41.7% compared to 13.5% (P = 0.007). Improved healing rates in the TOT group were also demonstrated by adjusted Cox propor­tional hazards modelling that yielded a hazard ratio of 4.66 (97.8% CI 1.36–15.98, P = 0.004). The real-world impact of this device on hospitalizations and amputa­tions in 202 patients with diabetic foot ulcers was reported in
a retrospective, comparative cohort study (Yellin et al. 2021). It found that 6.6 and 12.1% of those using cyclically pressurized topical oxygen had hospitalizations and amputations, respectively, at 1 year, compared to 54.1 and 41.4%, respectively, of those who had not used this adjunctive topical oxygen modality (each P < 0.0001).
Innovative Technology in Cellular and Molecular Therapies to Accelerate Healing
Stem Cell Therapy
The use of stem cell therapy to enhance the physiological processes of wound healing in diabetic foot ulcers has led to the development of various dressings and topical applications These techniques facilitate the delivery of growth factors, cytokines and chemokines within a structure or medium which maximises exposure of the wound to the relevant components to aid wound healing.
Using stem cell therapy to develop mesenchymal and mononuclear cell lineages has been shown to produce higher levels of collagen and growth factors, leadi ng to faster wound healing compared to standard care alone (Albehairy et al. 2018). There were signicantly higher rates of ulcer surface area reduction in those treated
58 D. Dixon and M. Edmonds
with mesenchymal or mononuclear groups of stem cells [68% with mesenchymal, 59% with mononuclear] compared to the controls [6.25%, p < 0.05] at 12 weeks (Albehairy et al. 2018). There was no signicant difference in ulcer healing between the two stem cell treated groups. Adipose stem cells, known to be an abundant source of mesenchymal stem cells, showed 80% healing at 6 months post lower-limb min or amputation, compared with 46% in the control group of standard care alone (p = 0.0064) (Lonardi et al.
2019).Ameta-anal
ysis of the efcacy of stem cell therapy in the treatment of diabetic foot ulcers looked at 14 studies with 683 participants. It concluded that stem cell therapy was more effective than standard treatment regarding ulcer healing, improving lower extremity ischaemia, increasing pain free walking distance and reducing rest-pain score compared with conventional therapy. It also demonstrated a reduction in amputation rates (Sun et al. 2022). However, there is a need for larger studies, involving multi-centre involvement with randomized double-blind placebo controlled trials to further evaluate long term efcacy of this treatment.
Gene Therapy
Developments in gene therapy using viral vectors to deliver growth factors to sites of ulcers is still in the early phases. Initial trials show some promise with the use of non-viral vectors in terms of lower risk of stimulating adverse side effects such as exaggerated immune responses, carcinogenesis and insertional mutagenesis. However, the use of viral vectors has demonstrated better therapeutic effects with lower levels of adverse effects (Kwon et al. 2012; Dixon and Edmonds 2021).
Nanotechnology
There are a number of trials in the early stages of investigation looking at different medium
o deliver targeted gene therapy to affected sites including those using
s t nanotechnology. Exploration of the use of lipid nano-carriers (liposomes, solid lipid nanoparticles, niosomes and ethosomes) as drug delivery systems has shown pro­mise in aiding diabetic foot ulcer healing (Kandregula et al. 2022). The lipid nano-carriers can be used to encapsulate nucleic acids like siRNA and miRNA to silence the expression of inammatory cytokines which are often seen in chronic wounds. They can also be used to encapsulate proteins, peptides and growth factors which can be d elivered to the wound bed and facilitate wound healing (Kandregula et al. 2022)
Devel
ets
.
opments in nanotechnology to aid wound healing have shown early ben-
in animal models of rats with diabetic neuropathy and ulceration. The use of Poly lactic-co-glycolic-acid (PLGA) as a synthetic polymer material on which to load growth factors to deliver directly to wounds has been shown to improve wound healing in animal models (He et al. 2021). The main focus with developing nanoparticle therapies is on properties which demonstrate structural similarity, biocompatibility and biodegradability between the different polymers and skin (He et al.
PLGA has many of these properties and is therefore one of the more
2021).
studied polymers in nano-technology. PLGA microspheres loaded with recombi­nant human Epidermal Growth Factor (EGF) nanoparticles showed faster
The Diabetic Foot, Its Complications, Role of Technology 59
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proliferation of broblasts and faster healing rates when compared with PLGA and recombinant human EGF. Similar effects have been demon strated with the use of curcumin nanoparticle gelatin microspheres, loaded into hydrogels. There was improved wound healing, collagen formation and neovascularisation (He et al.
2021; Liu et al. 2018).
Evidence for the Use of Technology on Offloading
Plantar pressure measurements have been shown to be useful in the design and assessment of therapeutic footwear for high risk diabetic patients: in particular, in-shoe plantar pressure analysis is an effective means to evaluate and guide footwear modications that reduce pressure in the neuropathic diabetic foot. By this means the quality of footwear can be improved and hence, reduce the risk for pressure-related plantar foot ulcers (Bus et al. 2011; Waaijman et al. 2012). The ofoading capability of therapeutic insoles or orthopaedic footwear can thus be improved when guided by plantar pressure measurement and the risk of ulcer recurrence reduced by 46–65%, assuming that the footwear is actually worn. This has been a pivotal step forward as footwear was previously designed and assessed on the expertise and skills of the prescribing physician and orthotist, and efficacy was gauged according to whether a foot ulcer subsequently occurred or not.
Covid 19 Pandemic and Management of the Diabetic Foot
One concern during the pandemic, was to nd a balance between reducing unnecessary travel to hospital for foot clinic appointments, and ensuring there was appropriate foot care for those with moderate to severe ulceration or new ulcers requiring specialist input. The use of technology to facilitate this judgement included mobile apps that encrypted messages and photographs with patient sen­sitive data. In South East London, the use of a communication app which also allowed seamless sharing of photos and encrypted patient information was approved through information governance in much shorter time frames than would normally take. The roll out of the app across 5 hospitals allowed the seamless sharing of information about clinical cases across a region where expert advice on wound care, dressing management and decisions for surgical intervention could be made as needed without the patient having to travel unnecessarily. It also allowed support across community, primary and secondary care teams. Across the world, there was a noticed reduction in visits to diabetes foot clinics with visits falling as much as 70% in Los Angeles and 50% in Manchester UK to 29% in Argentina (Miranda et al. 2022). The International Working Group on Diabetic Foot and D-Foot International developed a fast-track pathwayfor non-specialist health care professionals with the aim to reduce late referrals with foot ulcers and reduce diabetes related foot admissions to hospital (Meloni et al. 2021). It gave guidelines
60 D. Dixon and M. Edmonds
on time to see a specialist foot service with regard to severity of ulceration at presentation. Foot in Diabetes UK (FDUK) also wrote a guidance document stressing the importance of recognising foot and leg complications that are limb- or life-threatening and referring them to multidisciplinary clinics which remained open in the UK (Foot in Diabetes UK 2020).
There was a variability in technology across different countries to facilitate telemedi tions rather than video consultations. Despite this variability, a meta-analysis of four controlled-trials demonstrated that treating of diabetic foot ulcers via telemedicine was an effective alternative when face to face consultations are reduced or not possible (Yammine and Estephan 2022). A qualitative survey in Tuscany demon­strated patient satisfaction with telemedi cine as a means to monitor diabetic foot ulcers and would be happy for future use in monitoring the condition when needed (Iacopi et al. 2021).
cine
revie
ws.Often
the
term
telemedicine referred to telephone consulta-
Conclusion
We have described the usefulness of technology and evidence to aid diagnosis and management of diabetic foot ulcers. Technological advances have been made in the diagnosis and assessment of neuropathy, which successfully permit the prediction of ulcers but not as yet in the prevention of ulcers. Advances have been made in the measurement of plantar pressure to facilitate the development of efcient footwear which can reduce the risk of ulcer recurrence. Advances in the measurement of skin temperature have permitted the early diagnosis of skin breakdown. Foot skin temperature monitoring has prevented a rst or a recurrent foot ulcer in high risk patients, at between 65 and 75% compared with usual care. Point-of-care uores­cence imaging has aided the characterisation of infection and ulcer healing rates have been improved.
Technological advances have been made in the treatment of ulcers and the
e ba
evidenc trolled clinical trials. Their usefulness in real life is more difficult to gauge and further multicentre studies would be helpful. Also, some of these technologies especially gene therapy and nanotechnology are in the early stages of development and research and will require further studies in the clinical arena.
Whilst the treatment of ulcers and thus the prevention of amputations may be facilitated to be synchronised and harmonised into an organised multidisciplinary treatment of the diabet ic foot ulcer which embraces mechanical, microbiological, vascular and educational aspects of care in addition to the direct treatment of the ulcer itself. It is only then that patients will fully benet from the impact of these technologies and experience successful ulcer healing which is so eagerly desired but still eludes many of them.
se for many of these technologies has been established by well con-
by individual therapeutic innovations in technology, such advances have
The Diabetic Foot, Its Complications, Role of Technology 61
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