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Calculate the Michigan Neuropathy Screening Instrument (MNSI) score to assess the risk and presence of diabetic peripheral neuropathy. This tool combines patient-reported symptoms with physical examination findings.
Answer the following questions about symptoms (1 = Yes, 0 = No)
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128 Hz tuning fork test
128 Hz tuning fork test
Peripheral neuropathy is nerve damage that commonly affects the feet and legs, causing pain, numbness, and weakness. In people with diabetes, it's one of the most common complications, affecting up to 50% of patients over time.
The Michigan Neuropathy Screening Instrument (MNSI) is a validated tool designed to screen for diabetic peripheral neuropathy. It combines patient-reported symptoms with objective physical examination findings to assess neuropathy risk.
Untreated peripheral neuropathy can lead to serious complications including foot ulcers, infections, Charcot joint (bone and joint damage), and in severe cases, amputation. Early detection and proper management are crucial to prevent these outcomes.
High blood sugar levels over time damage the small blood vessels that supply nerves, particularly in the feet and legs. This reduces oxygen and nutrient delivery to nerves, causing them to malfunction or die. Other factors include inflammation, oxidative stress, and accumulation of toxic metabolic byproducts.
The MNSI has two components: a 13-question patient questionnaire (score ≥7 is abnormal) and a physical examination (score ≥2.5 out of 10 is abnormal). If either component is abnormal, peripheral neuropathy is likely and further evaluation is warranted.
In most cases, diabetic neuropathy cannot be completely reversed, but its progression can be slowed or stopped with excellent blood sugar control. Early-stage neuropathy may improve with aggressive glucose management, vitamin supplementation (especially B12), and lifestyle changes. The focus is on preventing further damage and managing symptoms.
Beyond screening tools like MNSI, diagnostic tests include nerve conduction studies (measure electrical signal speed), electromyography (EMG) to assess muscle electrical activity, quantitative sensory testing, skin biopsy to examine nerve fiber density, and blood tests to rule out other causes like vitamin deficiencies or thyroid problems.
The American Diabetes Association recommends screening all patients with type 2 diabetes at diagnosis and patients with type 1 diabetes five years after diagnosis. After initial screening, annual screening should continue. More frequent screening may be needed if symptoms develop or risk factors worsen.
First-line medications include pregabalin (Lyrica), gabapentin (Neurontin), and duloxetine (Cymbalta). Other options include tricyclic antidepressants (amitriptyline), SNRIs (venlafaxine), and topical treatments (capsaicin cream, lidocaine patches). Opioids are generally avoided due to addiction risk. Treatment is individualized based on pain severity and side effects.
Neuropathy reduces sensation, so injuries may go unnoticed. Small cuts or blisters can become infected and lead to serious complications including ulcers and amputation. Daily inspection helps catch problems early. Check between toes, examine soles with a mirror, look for color changes, swelling, or drainage, and seek immediate care for any concerning findings.
Warning signs include worsening pain or numbness, new areas affected, complete loss of sensation, difficulty walking or maintaining balance, foot deformities, recurring foot ulcers, inability to detect injuries, and loss of ankle reflexes. Report these changes to your healthcare provider immediately as they may indicate need for treatment adjustment or additional interventions.
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Medical Disclaimer: This calculator is for educational and screening purposes only. It should not replace professional medical advice, diagnosis, or treatment. The MNSI is a screening tool that identifies patients who may need further evaluation. Diagnosis and treatment of peripheral neuropathy should be managed by qualified healthcare professionals.