About Working Hand Syndrome

Overview

Working hand syndrome (WHS) is a newly defined neurological disease that affects individuals who have been working in physically demanding jobs that require the use of their hands and arms for at least 1 year. It is characterized by symptoms such as pain, numbness, tingling, and burning sensations in the hands, which tend to increase significantly during rest and nighttime. WHS primarily affects the sensory nerves in the upper extremities, without causing weakness in the muscles or abnormal deep tendon reflexes. This condition is more commonly observed in men who have been exposed to chronic overload from repetitive actions performed by their hands and arms. WHS is not associated with weakness in the muscles or abnormal deep tendon reflexes. To make a definitive diagnosis of WHS, similar diseases must be ruled out.

Causes and Risk Factors

The causes of working hand syndrome (WHS) are not fully understood, but it is believed that the chronic overload caused by repetitive actions performed by the hand and arm may lead to damage to the sensory nerves in the affected areas. It is important to note that vibrating tools are not a contributing factor to WHS.

Risk factors for WHS include:

• Gender: All reported cases of WHS were in men. This suggests that men may be more susceptible to developing the condition.
• Occupation: Individuals who have been working in physically demanding jobs that require repetitive use of their hands and arms for at least one year are at risk of developing WHS.
• Age
• Genetic predispositions
• Previous history of polyps
• Inflammatory bowel diseases (IBDs)

It's important to note that while some risk factors cannot be changed (non-modifiable), there are certain lifestyle modifications that can help reduce the risk of developing WHS. These include maintaining a healthy weight, engaging in regular physical activity, and following a healthy diet.

Symptoms

Working hand syndrome can cause a variety of symptoms that can vary depending on the stage and severity of the condition. Here are the most common early symptoms of working hand syndrome:

• Tingling in the hands: This is a common initial symptom experienced by patients. It is a sensation of pins and needles in the hands.
• Fatigability with repetitive movements: This can include activities such as typing, writing, or using tools.
• Feeling of heaviness in the arm: This can make it more difficult to perform tasks that require arm strength or coordination.
• Constant weakness: This weakness can affect grip strength and make it challenging to perform tasks that require fine motor skills.
• Loss of sensitivity in the fingers: This can make it difficult to feel and manipulate objects accurately.

As working hand syndrome progresses or becomes more severe, additional symptoms may occur. These symptoms can include:

• Muscle wasting in the hand: This means that the muscles in the hand become weaker and smaller over time.
• Difficulty with finger coordination: Individuals may have difficulty coordinating movements with their fingers.
• Pain in the hand and arm: Some people with working hand syndrome may experience pain in their hand and arm, which may worsen at night. This pain can be described as aching or burning.
• Shock-like or burning sensations: In addition to pain, individuals may also experience shock-like or burning sensations in their thumb and fingers. These sensations can be uncomfortable and may occur spontaneously or during certain activities.
• Weakness or clumsiness in the hand: As working hand syndrome advances, weakness or clumsiness in the hand may become more pronounced. This can lead to difficulties with gripping objects or performing tasks that require fine motor skills.

Diagnosis

To diagnose WHS, healthcare providers may perform the following examinations, tests, and procedures:

• Physical exam: During a physical exam, the healthcare provider will carefully examine your hand and assess for any physical signs of the syndrome, such as pain, swelling, or deformities.
• Neurocognitive testing: This is a type of testing that evaluates your cognitive abilities, such as speech, attention/working memory, abstraction/executive function, learning/recall, information processing speed, and motor functions. It is considered the gold standard for assessing neurocognitive impairment associated with working hand syndrome.
• Radiology studies: These imaging studies, such as X-rays or MRI scans, allow doctors to look inside your hand and assess for any structural abnormalities or damage to the bones, joints, or soft tissues.
• Biochemical analyses: These tests involve analyzing samples of cerebrospinal fluid (CSF) to check for any abnormalities that may be associated with Working Hand Syndrome.
• Electrophysiological studies: These studies include tests like EEG (electroencephalogram) and SEP (somatosensory evoked potentials), which measure electrical activity in the brain and nerves respectively. They can help identify any abnormalities in nerve function that may contribute to working hand syndrome.

It's important to note that while these examinations and tests can provide valuable information for diagnosis, working hand syndrome is primarily diagnosed based on clinical evaluation rather than solely relying on technical findings.

To determine the stage or severity of working hand syndrome, additional examinations, tests, and procedures may include:

• Repeat neurocognitive testing: Periodic reassessment of neurocognitive function can help track any changes or progression in the severity of cognitive impairment associated with working hand syndrome.
• Imaging studies: Follow-up imaging studies may be recommended to monitor any changes in the hand's structure or to assess the effectiveness of treatment interventions.
• Functional assessments: These assessments evaluate how well you can perform specific tasks using your hand and measure any limitations or difficulties you may experience due to working hand syndrome.
• Pain assessments: Pain scales or questionnaires may be used to assess the severity and impact of pain associated with working hand syndrome.
• Quality of life assessments: These assessments help evaluate how working hand syndrome affects your overall well-being and daily functioning.

Remember that each individual's diagnosis and treatment plan will vary based on their specific symptoms and needs. It's always best to consult with a healthcare provider for personalized guidance regarding examinations, tests, and procedures related to working hand syndrome.

Treatment Options

The main goals of treatment for working hand syndrome are to maintain or improve hand mobility and functioning and to reduce pain. There are several types of treatments and therapies that can help achieve these goals. Here is a breakdown of the different approaches:

• Physiotherapy and Occupational Therapy:
  • These therapies aim to compensate for pathological movement patterns and prevent long-term damage, such as contractures due to insufficient use as a result of pain avoidance.
  • Physiotherapy focuses on repetitive pain-free movements and training of fine motor skills with and without resistance.
  • The duration of physiotherapy or occupational therapy should be around 20-30 minutes a day with 5 therapy sessions per week if possible.
• Medication:
  • The types of medications commonly used include:
    • Selective serotonin reuptake inhibitors (SSRIs)
    • Serotonin and norepinephrine reuptake inhibitors (SNRIs)
    • Tricyclic antidepressants (TCAs)
    • Monoamine oxidase inhibitors (MAOIs)
    • Other antidepressants (such as bupropion and trazodone)
    • Anxiolytics (medications for anxiety)
    • Antipsychotics
    • Atypical antipsychotics (such as risperidone and aripiprazole)
    • Anticonvulsants
    • Centrally acting sympathomimetics (such as methylphenidate and amphetamine)
    • Hypnotics and sedatives
    • NMDA receptor antagonists (such as memantine and amantadine)
    • Imidazoline receptor agonists (such as guanfacine and clonidine)
• These medications can help manage pain, improve mood, reduce anxiety, and address other symptoms associated with working hand syndrome.
• Therapeutic Brain Stimulation:
  • This includes transcranial magnetic stimulation (TMS) and transcranial direct current stimulation, may be used in the treatment of working hand syndrome.
  • These techniques involve applying magnetic or electrical stimulation to specific areas of the brain to modulate neural activity.
  • Therapeutic brain stimulation has shown promise in reducing pain and improving functional outcomes in some individuals with working hand syndrome.
• Behavioral Therapy:
  • Behavioral therapy, including psychosocial therapy, family therapy, applied behavior therapy, and specialized therapies such as speech therapy, can be beneficial for individuals with working hand syndrome.
  • These therapies focus on addressing psychological factors that may contribute to pain perception and functional limitations.
  • Behavioral therapy aims to improve coping strategies, enhance emotional well-being, and promote overall functioning.
• Other Treatments:
  • These include health behavior changes, such as lifestyle modifications, stress management techniques, and relaxation exercises.
  • Additionally, therapeutic procedures like mobilization and traction therapy can be individually adapted to the patient's needs.
  • These procedures involve repetitive pain-free movements and training of fine motor skills with or without resistance.

Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Other side effects can occur. Check with your health care professional or read the information provided with your medication for additional side effect information.

Progression or Complications

Severe cases of WHS can lead to a complete loss of hand function. The natural progression of working hand syndrome involves the following stages:

• Early stage: During this stage, patients may experience pain, swelling, and limited range of motion in the affected hand and shoulder. The skin and muscles may appear normal.
• Intermediate stage: In this stage, the pain intensifies and spreads to other parts of the upper limb. The affected limb may show signs of atrophy, which means that the skin and muscles start to waste away. Joint activities become more limited.
• Late stage: At this stage, there is a significant loss of hand function due to muscle atrophy and joint stiffness. The skin becomes thin and shiny, and there may be noticeable changes in the nails and hair growth on the affected limb.

Complications commonly associated with working hand syndrome include:

• Functional impairment: The loss of hand function can greatly impact daily activities such as gripping objects, writing, or performing self-care tasks.
• Chronic pain: The persistent pain can significantly reduce quality of life and affect mental well-being.
• Joint deformities: Over time, joint malalignment and instability can occur, leading to joint deformities that further limit mobility.
• Reduced joint mobility: Stiffness and decreased range of motion in the affected limb can make it difficult to perform simple tasks.
• Emotional impact: Living with chronic pain and functional limitations can lead to feelings of frustration, depression, or anxiety.

Treatment for working hand syndrome aims to alleviate pain, slow disease progression, and improve functional outcomes. It typically involves a multidisciplinary approach that may include:

• Physical therapy: Physical therapy exercises help maintain joint mobility and strengthen muscles in the affected limb.
• Occupational therapy: Occupational therapists teach patients adaptive techniques to perform daily tasks more easily despite their limitations.
• Medications: Pain relievers or anti-inflammatory medications may be prescribed to manage pain and reduce inflammation.
• Nerve blocks: In some cases, nerve blocks may be used to temporarily relieve severe pain.
• Sympathetic nerve stimulation: This technique involves applying electrical stimulation to the nerves in the affected limb to help reduce pain.
• Psychological support: Counseling or therapy may be beneficial for patients dealing with emotional distress related to their condition.

It's important for individuals with working hand syndrome to consult with their healthcare provider for an accurate diagnosis and personalized treatment plan. While there are home remedies or over-the-counter medications that some people may find helpful for symptom management, it's crucial to seek professional medical advice before trying any new treatments or interventions.