Disease Description (Causes and Symptoms)
- Definition: A peripheral neuropathy caused by compression of the median nerve in the carpal tunnel of the wrist, resulting in abnormal sensations in the hand (tingling, burning), pain, and muscle weakness (particularly reduced strength on the thumb side).
- Pathophysiology: Increased pressure within the carpal tunnel or a reduction in the cross-sectional area of the tunnel causes compression of the median nerve and impaired blood flow. If repeated compression continues, myelin damage, reduced axonal function, and muscle atrophy (thenar muscle atrophy) may occur.
- Main causes and risk factors: Repetitive wrist use (flexion, extension, vibration), middle-aged women, obesity, diabetes, pregnancy (temporary), chronic renal failure (dialysis), rheumatoid arthritis, hypothyroidism, etc.
- Main symptoms: Tingling or decreased sensation in the thumb, index finger, middle finger, and part of the outer side of the ring finger (the little finger is usually not affected), worsening of symptoms at night, frequently dropping objects, weakened thumb abduction/movement due to thenar muscle atrophy, and possible radiating pain in the arm or shoulder.
Treatment Methods
- Conservative treatment (mild or early cases)
- Wrist brace/night splint (maintaining a neutral position) — particularly effective for improving nighttime symptoms.
- Medication: Symptomatic anti-inflammatory analgesics such as NSAIDs (for pain relief).
- Local steroid injection: May improve symptoms in the short term, but repeated injections should be considered cautiously.
- Improvement of the work environment, wrist stretching, and rest (avoiding repetitive tasks and excessive wrist flexion/extension).
- Diagnostic and therapeutic tests
- Nerve conduction study and electromyography (EMG): Evaluation of the presence and severity of compression and whether there is muscle damage (thenar muscle atrophy).
- Ultrasound: Helpful for identifying nerve swelling within the carpal tunnel. X-rays are mainly used to differentiate spinal (cervical) lesions.
- Surgical treatment (when symptoms are severe or conservative treatment fails)
- Carpal tunnel release: Relieves compression by cutting the transverse carpal ligament.
- Surgical techniques: Traditional open release or endoscopic/minimally invasive methods. The recovery speed and pain may differ, but the basic principle is the same.
- Indications: Impairment of daily activities, failure to respond to conservative treatment, or persistent and progressive neurological deficits (sensory loss, muscle weakness, and muscle atrophy), etc.
- Precautions and self-management
- Blood glucose control before and after surgery (for patients with diabetes), infection-risk management, and awareness that smoking may delay recovery.
- If carpal tunnel symptoms persist for a long time and muscle atrophy is severe, functional recovery may be incomplete.
- Workplace adjustments are recommended for occupations involving repetitive wrist stress (e.g., hairdressers, assembly work, etc.).
Checklist Before an Outpatient Visit (Including Sample Questions)
- Items to prepare (recommended to bring)
- A list of all medications currently being taken (including prescription drugs, over-the-counter medicines, and supplements)
- Previous test results (nerve conduction study/EMG, ultrasound, X-ray, etc.) and images/documents
- Information about underlying conditions (diabetes, thyroid disease, renal failure or dialysis status, rheumatic diseases)
- Symptom records: when symptoms began, how often they occur (especially nighttime frequency), which movements worsen them, how often objects are dropped, etc.
- Information to tell the doctor in advance during the visit
- Whether symptoms are worsening (changes over time), occupation and whether the hands are used repetitively, and whether you are pregnant
- Sample questions (phrases for the patient to ask the doctor)
- "At what degree of abnormality on my nerve conduction study would you recommend surgery?"
- "If my symptoms cannot be controlled with a night splint and steroid injection, what is the next step?"
Examples of General Questions to Ask the Doctor
- What are the expected effects and side effects of this medication (or injection)?
- How should I interpret the results of my nerve conduction study/EMG? Are they considered severe?
- If surgery is recommended, what is the expected recovery period and when can I expect to return to daily activities and work?
- What lifestyle changes should I make to reduce the risk of recurrence and prevent it?
Examples of Condition-Specific Questions
- "Atrophy of the thenar muscles is visible. To what extent is this muscle's function likely to recover after surgery?"
- "My symptoms are currently worse mainly at night. Which would be more appropriate for me: a night splint or a steroid injection?"
Additional reference: Diagnosis is based on clinical symptoms (the distribution of tingling, the Phalen test, the Tinel test, etc.) and electrophysiological examinations. The appropriate treatment is determined by considering the severity of symptoms, nerve conduction study findings, and the impact on work and daily life as a whole.