About Diabetic Foot Ulcer

Overview

A diabetic foot ulcer is an open sore or wound on the skin that cannot heal properly. It typically occurs in individuals with diabetes, especially those who have neuropathy (nerve damage) in their legs and feet. The ulcer may start as a minor injury, such as a cut or blister, but due to a combination of factors like slow healing and reduced sensation, it can progress into a non-healing wound. Diabetic foot ulcers are often located below the ankle and can become infected if not properly treated. They pose a significant risk to the overall health of the leg and may require medical intervention, such as amputation, if left untreated for an extended period of time. It's important for individuals with diabetes to be vigilant about foot care and seek prompt medical attention if they notice any signs of ulcers or wounds on their feet.

Causes and Risk Factors

The pathophysiologic causes of Diabetic Foot Ulcers (DFUs) are multifactorial and can include the following:

• Immunopathy: Impaired immune response can make it harder for the body to fight off infections, leading to the development of ulcers.
• Neuropathy: Nerve damage can result in a loss of sensation in the feet, making it difficult for individuals to detect injuries or wounds that can lead to ulcers.
• Neuroarthropathy: This condition, also known as Charcot foot, is characterized by joint deformities and instability due to nerve damage. It can contribute to the development of DFUs.
• Vasculopathy: Poor blood circulation in the feet can impair wound healing and increase the risk of ulcers.
• Mechanical stress: Excessive pressure or trauma on the feet, often due to poorly fitted shoes or abnormal foot structure, can lead to tissue damage and ulcer formation.

Non-modifiable risk factors for DFUs include:

• Older age
• Male sex
• Type 2 diabetes
• Longer duration of diabetes
• Diabetic retinopathy

Modifiable risk factors for DFUs include:

• Poorly fitted or poor quality shoes
• Poor hygiene
• Improper trimming of toenails
• Alcohol consumption
• Heart disease
• Kidney disease
• Obesity
• Tobacco use

It's important to note that these risk factors increase the likelihood of developing DFUs but do not guarantee their occurrence. Proper foot care and management of diabetes are crucial in reducing the risk.

Symptoms

The most common early symptoms of Diabetic Foot Ulcer include:

• Drainage from the foot that may stain socks or leak out in the shoe
• Unusual swelling, irritation, redness, and odors from one or both feet
• Black tissue (eschar) surrounding the ulcer due to a lack of healthy blood flow
• Partial or complete gangrene, which can cause odorous discharge, pain, and numbness

As the condition progresses or reaches higher severity, additional symptoms may occur:

• Skin discoloration, especially tissue turning black
• Pain around an area that appears callused or irritated
• Fissures, blisters, and abundant callus formation
• Increased temperature in affected regions

It's important to note that signs of foot ulcers are not always obvious, and sometimes there may be no symptoms until the ulcer becomes infected. If you notice any skin discoloration or experience pain around an area that appears callused or irritated, it is important to consult with your doctor for proper evaluation and management.

Diagnosis

To diagnose Diabetic Foot Ulcer (DFU), the following examinations, tests, and procedures are commonly performed:

• Complete foot examination: This includes assessing blood pressure, checking for altered sensations, evaluating pedal pulses, and examining for bony foot deformities.
• Laboratory testing: Blood tests may be done to measure complete blood cell counts, creatinine, glycated hemoglobin (HbA1c), erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP) levels.
• Ankle-brachial index (ABI): This test measures the blood pressure in your ankle and arm to assess peripheral arterial disease (PAD).
• Imaging: X-rays and MRI scans may be used to evaluate the extent of tissue damage, detect bone involvement, or assess infection.

Additional examinations, tests, and procedures to determine the stage or severity of DFU may include:

• Microcirculation assessment: Techniques such as TCPO2, laser doppler flowmetry, hyperspectral imaging, and laser speckle contrast imager can help evaluate the microvascular function in tissue injury and inflammation.
• Nerve function tests: Quantitative sensory testing, vibration perception testing, galvanic skin response, and sudomotor activity testing can assess nerve damage associated with DFU.
• Temperature measurement: Infrared thermography can help identify areas of increased temperature associated with inflammation or infection.
• Biomechanical properties measurements: Plantar pressure and ultrasound indentation tests/elastography can assess pressure distribution on the foot and tissue stiffness.

Remember, these examinations, tests, and procedures should be conducted by healthcare professionals to accurately diagnose and determine the stage or severity of DFU.

Treatment Options

The goals of treatment for Diabetic Foot Ulcer are to promote healing, prevent infection, relieve pressure on the area, and prevent further complications. Here are the recommended treatments and how they work to achieve these goals:

Medication types:

• Antibiotics: Prescribed if there is an infection present. They help fight against the infection-causing organisms.
• Topical medications: Applied directly to the ulcer to promote healing and prevent infection.

Therapies:

• Debridement: Removal of damaged tissue from the ulcer to facilitate healing.
• Skin grafts: Surgical procedure where healthy skin is transplanted onto the ulcer site to aid in healing.
• Vascular surgery: Performed to improve blood circulation to the affected area.
• Reconstruction procedures: Such as realigning or fusing joints and lengthening tendons, may be done to relieve pressure and promote healing.

Therapeutic procedures:

• Offloading pressure: Using crutches, a wheelchair, or a non-removable cast to reduce pressure on the ulcerated area and allow for healing.

Health behavior changes:

• Regular foot care: Keeping feet clean, moisturized, and dry. Checking for any injuries or abnormalities daily.
• Wearing proper-fitting shoes: To prevent friction and pressure on the feet.
• Maintaining blood sugar levels within target ranges: To promote wound healing and reduce complications.
• Quitting smoking: Smoking impairs blood circulation, which can hinder healing.

Other treatments:

• Saline, growth factors, ulcer dressings, and skin substitutes may be used to promote wound healing.

Remember, treatment plans should be personalized. Consult with your healthcare professional for specific recommendations tailored to your situation.

Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Other side effects can occur. Check with your health care professional or read the information provided with your medication for additional sides effect information.