Name of the Procedure:

Quantitative Sensory Testing (QST) using Vibration Stimuli to Assess Large Diameter Fiber Sensation

Summary

Quantitative Sensory Testing (QST) using vibration stimuli is a diagnostic procedure used to assess the function of large sensory nerve fibers in the extremities. It helps in identifying abnormalities in sensory perception by using specific vibration frequencies.

Purpose

QST using vibration stimuli aims to:

• Diagnose sensory neuropathies
• Assess nerve damage from conditions such as diabetes or nerve compression syndromes
• Monitor the progression of neurological diseases

Indications

• Unexplained numbness or tingling in extremities
• Chronic pain or altered sensation in arms or legs
• Monitoring of known conditions like diabetes, multiple sclerosis, or carpal tunnel syndrome
• Evaluating effectiveness of treatments for nerve-related disorders

Preparation

• No fasting or medication adjustments typically required.
• Patients should inform their healthcare provider of any current medications and medical history.
• Diagnostic tests, like nerve conduction studies, might be performed beforehand.

Procedure Description

1. The patient will be seated comfortably.
2. Specific vibration devices are applied to targeted areas of the extremity.
3. The devices emit vibrations at different frequencies and intensities.
4. The patient's perception and response to the vibrations are recorded to assess sensory nerve function.
5. The procedure is repeated on multiple points of the extremity.

Tools/Equipment: Vibration devices calibrated to specific frequencies and intensities.

Duration

Typically takes 30 to 60 minutes, depending on the number of extremities tested.

Setting

Usually performed in an outpatient clinic or specialized neurology diagnostic center.

Personnel

• Neurologists or specialized technicians
• Nurses or medical assistants

Risks and Complications

• Generally low-risk; non-invasive.
• Rare risk of slight discomfort or skin irritation at the test sites.

Benefits

• Provides detailed information on nerve function.
• Helps in early detection and diagnosis of nerve damage.
• Can guide effective treatment plans.

Recovery

• No significant recovery time needed.
• Patients can resume normal activities immediately after the procedure.
• Follow physician’s advice on any ongoing treatments.

Alternatives

• Nerve conduction studies: measures electrical conduction of nerves.
• Electromyography (EMG): assesses muscle response to nerve stimulation.
• Clinical examinations and symptom history analysis.
• Pros and cons of alternatives: QST offers a non-invasive option focused on sensory perception without electrical stimulation, unlike nerve conduction studies or EMG.

Patient Experience

• Patients may feel slight vibration and varying degrees of sensation.
• Usually well-tolerated with minimal discomfort.
• No pain management typically required; procedure is designed to be as comfortable as possible.