Role Of Foot Screening In Patients With Diabetes

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What is diabetes?

Diabetes is a metabolic disease that is characterized by increased blood sugar or hyperglycemia. It can occur due to derangements in insulin secretion, action or both. This increased blood sugar state can affect different organ systems which include blood vessels, eyes, heart, nerves, kidneys, and foot. Long standing diabetes is known to cause damage, dysfunction, and failure of these organs.

How diabetes affects the foot?

Diabetes can cause micro vascular and macro vascular complications. In the foot diabetes can lead to diabetic neuropathy and peripheral vascular disease. About 10% of patients develop foot ulcers due to these complications. Uncontrolled diabetes and chronically raised sugar levels damage the ability to sense pain and temperature leading to diabetic neuropathy. In 90% of the patients distal symmetrical polyneuropathy (DSPN) is the commonest form of sensory diabetic neuropathy (Tesfaye, Boulton and Dickenson, 2013). Peripheral vascular disease affects the blood circulation to the extremities and because of low blood flow the infection risks are greater. This can lead to gangrene and ulceration. Due to severe ischemia secondary to these mechanisms patients can be completely asymptomatic. (Figure 2) This highlights the importance of regular foot screening in diabetics.

Global burden of diabetes

The International Diabetes Federation estimated that 425 million people in the world are affected by diabetes of which 46% are undiagnosed. By the year 2045 this figure is expected to rise to 629 million.

What is screening?

According to WHO “Screening is defined as the presumptive identification of unrecognised disease in an apparently healthy, asymptomatic population by means of tests, examinations or other procedures that can be applied rapidly and easily to the target population.”

The lifetime risk of a person with diabetes developing a foot ulcer could be as high as 25% (Singh, 2005). Poor diabetic control and management of diabetic foot complications result in amputation. (New et al., 1998) says that the relative risk of amputation associated with all types of diabetes is 13 times that of non-diabetics. Thus, foot screening is mandatory in diabetics and should be done at regular intervals.

Goals of screening:

Prevention and or early detection, of diabetic foot complications
Appropriate treatment and management
Reduce progression to amputation

When to screen? (NICE) (2015), (SIGN) (2017)

At diagnosis
Annually there after
If the patients notice any new/significant change

How to screen?

Validated foot screening questionnaire
Inspection
Sensory testing
Palpation of peripheral pulses
Check for foot deformities and callus
Previous foot ulcerations/ Gangrene

Screening should include conventional clinical examination, history, agreement on treatment regimen/ risk stratification, education on diabetic foot and rapid referral to appropriate specialist if needed. (NICE) (2015), (SIGN) (2017)

History

Detailed personal and diabetic history (age, gender, ethnicity, duration, medication, blood sugar control, symptoms of hyperglycemia, hypoglycaemia, ischemia and neuropathy)
Previous and current foot complications (repetitive minor trauma, use of over the counter medications)
Detailed medical and surgical history (Rheumatoid arthritis, Renal disease, Cardiovascular disease, any surgeries including amputation, peripheral vascular disease)
Social history (Managing daily activities, physical exercise, smoking, alcoholism)

Examination:

Skin over the foot (Colour, pain, abrasion, ulceration)
Neuropathy (using graduated tuning fork, thermal discrimination devices, 10g monofilaments, or vibration perception thresholds (Young et al., 1994) (Abbott et al., 1998)
Peripheral vascular disease (palpation of peripheral pulses preferred for screening, ankle brachial pressure index can be falsely high in patients with elevated systolic pressures)
Foot deformities (hallux valgus, hallux rigidus and hammer toes, claw toes, ankle equinus, high arch and calluses)
Appropriate foot wear

Education

Appropriate education about the disease and complications has yielded both short term and long-term improvement amidst the patients (Valk, Kriegsman and Assendelft, 2002).

Considering factors such as ethnicity and age when educating patients are important.
Self-care and monitoring, good foot hygiene, nail care, self-examination and use of moisturisers
Explain the danger signs such as blood-stained callous, skin injuries and infections
Dangers of neglect should also be communicated to the patient
Foot wear advice

Appropriate referral

Supervision of a multidisciplinary diabetic foot care team (specialist podiatrists, orthotist, nurses with training in diabetic wound care, diabetes physicians, vascular surgeons, interventional radiologists and microbiologists.)
Onward referrals to, and supervision of treatment by necessary specialists

For screening programmes to run effectively access to specialist services must be rapid, and there should be good communication between the primary and secondary care providers

Conclusion

The global burden of diabetes is on the rise, this is mostly attributed to the increasing population, life expectancy and modification of lifestyle including urbanisation. It is thus imperative to introduce a uniform screening and management guideline to prevent diabetic complications (Formosa, Gatt and Chockalingam, 2016).

The famous Scottish poet Thomas Campbell once wrote, “Coming events cast their shadows before.” Proper screening and patient education with prompt and appropriate referral can go a long way in minimising the impact of diabetic foot complications.

BIBLIOGRAPHY

SKYLER, J.S., BAKRIS, G.L., BONIFACIO, E., DARSOW, T., ECKEL, R.H., GROOP, L., GROOP, P., HANDELSMAN, Y., INSEL, R.A., MATHIEU, C., MCELVAINE, A.T., PALMER, J.P., PUGLIESE, A., SCHATZ, D.A., SOSENKO, J.M., WILDING, J.P.H. & RATNER, R.E., 2017. Differentiation of Diabetes by Pathophysiology, Natural History, and Prognosis. Diabetes. 66(2), pp.241-255. Available from: http://dx.doi.org/10.2337/db16-0806.
TESFAYE, S., BOULTON, A.J.M. & DICKENSON, A.H., 2013. Mechanisms and Management of Diabetic Painful Distal Symmetrical Polyneuropathy. Diabetes Care. 36(9), pp.2456-2465. Available from: 10.2337/dc12-1964.
ARMSTRONG, D.G., BOULTON, A.J.M. & BUS, S.A., 2017. Diabetic Foot Ulcers and Their Recurrence. The New England Journal of Medicine. 376(24), pp.2367-2375. Available from: http://dx.doi.org/10.1056/NEJMra1615439
INTERNATIONAL DIABETES FEDERATION. DIABETES ATLAS EIGHTH EDITION 2017
WORLD HEALTH ORGANISATION
SINGH, N., ARMSTRONG, D.G. & LIPSKY, B.A., 2005. Preventing foot ulcers in patients with diabetes. Jama. 293(2), pp.217-228. Available from: https://search.proquest.com/docview/67362230?accountid=15977
NEW, J., MCDOWELL, D., BURNS, E. & YOUNG, R.,1998. Problem of amputations in patients with newly diagnosed diabetes mellitus. Diabetic Medicine. 15(9), pp.760-764.
NATIONAL INSTITUTE FOR HEALTH AND CLINICAL EXCELLENCE (NICE), Diabetic foot problems, Patient Management of Diabetic Foot Problems London: NICE, 2015
SCOTTISH INTERCOLLEGIATE GUIDELINES NETWORK 2017, SIGN 116: Management of Diabetes, Scottish Intercollegiate Guidelines Network, Edinburgh.
YOUNG, M., BREDDY, J., VEVES, A. & BOULTON, A., 1994. The Prediction of Diabetic Neuropathic Foot Ulceration Using Vibration Perception Thresholds: A prospective study. Diabetes Care. 17(6), pp.557-560.
ABBOTT, C., VILEIKYTE, L., WILLIAMSON, S., CARRINGTON, A. & BOULTON, A., 1998. Multicentre Study of the Incidence of and Predictive Risk Factors for Diabetic Neuropathic Foot Ulceration. Diabetes Care. 21(7), pp.1071-1075.
SCOTTISH DIABETIC FOOT ACTION GROUP (SDFAG) 2016
VALK, G., KRIEGSMAN, D. & ASSENDELFT, W., 2002. Patient education for preventing diabetic foot ulceration. Endocrinology and Metabolism Clinics of North America. 31(3), pp.633-658.
FORMOSA, C., GATT, A. & CHOCKALINGAM, N., 2016. A Critical Evaluation of Existing Diabetic Foot Screening Guidelines. The Review of Diabetic Studies. 13(2-3), pp.158-186.

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