Disease Description (Causes and Symptoms)
- Definition and pathophysiology: This condition occurs when the median nerve passing through the carpal tunnel in the wrist is compressed. Its main features are sensory abnormalities in the area supplied by the median nerve and weakness of the thenar muscles. Compression is caused by a reduced cross-sectional area of the carpal tunnel (due to thickening of complex tissues, space-occupying tumors, bony lesions, etc.) or an increase in the contents within the tunnel (edema, fluid increase related to menstruation, pregnancy, or dialysis, inflammatory diseases, etc.).
- Major causes and precipitating factors: Middle-aged women, obesity, diabetes, chronic kidney failure (dialysis), pregnancy (temporary), structural changes in the tunnel due to rheumatoid arthritis or injury, repetitive wrist use (prolonged computer or mobile phone use, occupational repetitive movements), and other conditions that narrow the carpal tunnel or increase pressure.
- Main symptoms: Tingling or decreased sensation in the thumb, index finger, middle finger, and part of the ring finger (the median nerve distribution), worsening of symptoms at night (awakening), burning or numbness in the hand, frequently dropping objects, morning stiffness or hand cramps, and, as the condition progresses, decreased thumb abduction and grip strength and muscle atrophy (thenar muscle atrophy).
Treatment Methods and Precautions
- Conservative treatment (mild or early cases)
- Wrist splint (worn at night or during the day in a neutral position) and work/posture correction (limiting repetitive movements and taking breaks)
- Medication: Pain management with nonsteroidal anti-inflammatory drugs (NSAIDs) (for symptom relief)
- Local steroid injection: Effective for symptom relief and also useful diagnostically (the effect may be temporary)
- Physical therapy (nerve gliding, stretching, etc.) and occupational therapy
- Surgical treatment (severe cases or failure of conservative treatment)
- Carpal tunnel release: Incision of the transverse carpal ligament to decompress the median nerve
- Methods: Open surgery or endoscopic surgery (minimizing the skin incision). The operation is usually brief (approximately 30 minutes).
- Indications: Neurological deficits that do not respond to or are worsening despite conservative treatment (sensory or motor loss, muscle atrophy), severe pain, or compression after acute trauma.
- Postoperative care: Wound care, rehabilitation to restore hand function (strength and sensory recovery training), and monitoring for infection and complications
- Precautions and complications
- Complications: Infection, nerve injury (rare), incomplete release or recurrence, pillar pain, delayed postoperative recovery, and, rarely, complex regional pain syndrome (CRPS)
- Considerations before and after surgery: Control of underlying conditions such as diabetes and thyroid disease, checking whether anticoagulants are being taken (consultation about whether discontinuation is necessary), and prioritizing nonsurgical treatment during pregnancy
- Prognosis: Improvement rates are generally high (many patients experience resolution of tingling and nighttime symptoms after surgery). However, if symptoms have persisted for a long time and muscle atrophy has progressed, recovery may be slow or some residual effects may remain. Reports indicate that the majority of surgical patients have satisfactory outcomes.
Checklist Before an Outpatient Visit (Examples of Items and Records to Prepare)
- Items/materials to bring
- A list of currently used medications (including prescription drugs, over-the-counter medicines, and supplements), especially whether anticoagulants, antiplatelet drugs, or steroids are being taken
- Copies of previous test results, if available (nerve conduction studies, electromyography, wrist imaging, blood glucose and thyroid tests, etc.)
- Records of occupation, main tasks, and hobbies (whether they involve repetitive wrist use), as well as activities associated with symptoms
- Symptom records (if possible, by date)
- When symptoms started and how they have progressed (gradual or acute)
- Symptom frequency and timing (for example, whether they cause awakening at night), and whether objects are frequently dropped or gripping objects is difficult
- Location of pain or tingling (which fingers, and whether it affects one or both hands)
- Factors that relieve symptoms (rest, stretching, changes in posture, etc.)
- Other points to check
- Previous wrist trauma or surgery, rheumatoid disease, pregnancy, and chronic diseases (diabetes, kidney failure, etc.)
- Plans for returning to work (consultation is needed regarding the return-to-work period if surgery is performed)
Example questions (to check for yourself during the outpatient visit)
- How and in which fingers do the symptoms occur?
- Do the symptoms mainly occur at night? Do you frequently drop objects?
- What medications are you currently taking?
Examples of General Questions to Ask the Doctor
- What is the exact cause of this condition? (What causes are suspected, and what can be confirmed through testing?)
- Which tests are recommended for my symptoms, and how will treatment differ depending on the test results?
- Which is more appropriate for me, conservative treatment or surgery? What are the success rate and risks?
- What are the effects and side effects of steroid injections? How often can they be administered?
- If I have surgery, how long will the recovery period be, and when can I resume daily activities and return to work?
- How likely is recurrence, and what lifestyle changes should I make to prevent it?
Examples of Condition-Specific Questions
- My symptoms are mainly severe at night. How likely is it that they will improve with nighttime splinting and injection treatment alone?
- My finger strength is already weak, and the thenar muscle has slightly become hollowed out. If I undergo surgery, how quickly and to what extent can I expect my sensation and strength to recover?
(If necessary, individualized consultation based on the testing and treatment plan is recommended.)