Mucopolysaccharidoses

Disease Description (Causes and Symptoms)

Diabetic peripheral neuropathy is a common complication of diabetes that occurs when peripheral nerves (mainly sensory nerves and small and large fibers) are damaged by chronic hyperglycemia. Pathophysiologically, metabolic and microvascular damage caused by hyperglycemia, oxidative stress, and reduced neurotrophic support damage nerve axons and their myelin sheaths. The main symptoms are as follows.

• Sensory abnormalities: tingling, prickling, burning sensations in the hands and feet (especially worsening at night), and reduced sensation (numbness)
• Pain: neuropathic pain (burning pain, electric shock-like sensations) — some patients have little or no pain
• Distribution: usually begins in a length-dependent “glove-and-stocking” distribution and ascends from the toes
• Autonomic symptoms (in some patients): changes in sweating, delayed gastric emptying, orthostatic hypotension, and sexual dysfunction

Treatment Methods

1. Fundamental treatment

   • Blood glucose control: the most important treatment for slowing the development and progression of the condition over the long term. Setting an individualized HbA1c target and maintaining ongoing management are recommended.

2. Pain control (symptomatic treatment) — main medications

   • First-line recommendations: duloxetine (a serotonin-norepinephrine reuptake inhibitor), pregabalin
   • Alternatives/add-on treatments: gabapentin, tricyclic antidepressants (amitriptyline, nortriptyline) — caution is needed in patients with cardiovascular disease and older adults
   • Topical treatment: lidocaine patches, high-concentration capsaicin patches (administered by medical professionals)
   • Selective short-term analgesic: tramadol (use cautiously); traditional strong opioids are not generally recommended
   • Medication selection should be adjusted according to kidney function, concomitant medications (drug interactions), and the adverse-effect profile

3. Nonpharmacological treatment and rehabilitation

   • Regular exercise (aerobic exercise + low-intensity strength training) and weight management
   • Smoking cessation and limiting alcohol consumption (to improve blood circulation)
   • Physical therapy, nerve stimulation treatment at a pain clinic (when selectively indicated), and other measures

4. Complications and prevention

   • Foot care: inspect the feet every day, wear appropriate shoes, manage calluses and misshapen toenails, and consult a podiatrist
   • Correct cardiovascular risk factors, including management of blood pressure, lipids, and kidney function

5. Referral criteria

   • Rapidly progressive sensory loss, recurrent foot ulcers, neurological deficits (weakness, gait disturbance), or suspected other causes (vitamin deficiency, thyroid disease, drug toxicity) require specialist referral to neurology, podiatry, vascular surgery, or other relevant specialties

Checklist Before an Outpatient Visit (Items to Prepare and Information to Provide; Examples of Main Items the Doctor May Ask About)

Items and materials to prepare

• A list of all medications currently being taken (including prescription drugs, OTC medications, and supplements)
• Recent blood glucose records (printouts of self-monitoring records and continuous glucose monitoring records, if available), and recent HbA1c test results
• Recent blood test results (kidney function, lipids, and electrolytes), electrocardiogram results, and other test results (if available)
• A symptom diary (when symptoms began, distribution, effects on sleep and daily life, aggravating and relieving factors) and photographs of the feet (to check foot condition)
• Previous nerve conduction studies (NCV/EMG) or a history of foot ulcers (if applicable)

Items the doctor will mainly ask about (organizing these in advance can help with the appointment)

• When the symptoms began, how they have changed, and the rate of progression
• The nature of the pain (burning, stabbing, tingling, etc.) and whether it worsens at night
• Whether there are wounds, ulcers, warmth, or swelling on the feet or legs
• The effects on daily life and sleep, and methods that help relieve the pain
• Alcohol consumption and smoking status, and exercise habits

Examples of General Questions to Ask the Doctor

• Can this pain be completely eliminated? What are the expected treatment goals?
• What blood glucose (HbA1c) target do you recommend? When should treatment be changed?
• Which first-line medication do you recommend for me, and what are its adverse effects? Does it interact with my other medications?
• What shoes and foot-care methods do you recommend to prevent foot ulcers?
• How does medication selection change if kidney function is reduced?

Examples of Disease-Specific Questions

• Among pain medications (e.g., duloxetine and pregabalin), which one would you recommend first for me, considering my kidney function (HbA1c, creatinine, etc.)?
• If I have almost no sensation in my feet, what symptoms at home (such as warmth, pain, or bleeding in the foot) should prompt me to visit immediately?