Tuberous sclerosis

Disease Description (Causes and Symptoms)

• Definition: Amyotrophic lateral sclerosis (ALS) is a degenerative neurological disease in which upper and lower motor neurons (motor nerve cells in the cerebrum, brainstem, and spinal cord) are progressively destroyed, resulting in decreased muscle strength and muscle atrophy. The cause has not been fully identified.
• Causes and pathophysiology: Multiple causes have been proposed, including sporadic and genetic factors, autoimmunity, metabolic and environmental factors, and hypotheses involving viral or heavy-metal exposure. Hereditary forms (e.g., SOD1 and C9orf72) have been identified in a small number of cases. Degeneration of upper and lower motor neurons causes denervation of muscle fibers, leading to muscle atrophy, fasciculations, spasms, and increased tone of antagonist muscles.
• Main symptoms:
  • Progressive muscle weakness (decreased limb strength), muscle atrophy, and muscle twitching (fasciculations)
  • Difficulty speaking (decreased articulation) and swallowing (dysphagia)
  • Respiratory muscle weakness → shortness of breath and nocturnal hypoventilation
  • Due to the nature of the disease, sensory, bladder, and cognitive functions are generally relatively preserved, but some patients may have cognitive and behavioral changes (frontotemporal dementia spectrum)
• Clinical course/prognosis: Symptoms progressively worsen after onset. Although there are individual differences, the average survival period is several years (depending on the literature and data, approximately 3–5 years), and some people may survive long term. The provided data reports that approximately 50% of patients die within 3–4 years.
• Diagnostic approach (brief): Evaluation of clinical upper and lower motor neuron signs; findings of denervation and reinnervation on nerve conduction studies/electromyography (EMG); exclusion of similar diseases using MRI and other tests (e.g., cervical spine lesions and polyneuropathy); and, when necessary, cerebrospinal fluid testing, muscle biopsy, or genetic testing.

Treatment Methods and Precautions

• There is currently no fundamental cure. The goals are to maintain function, prevent complications, relieve symptoms, and improve quality of life.
• Medication treatment
  • Riluzole: Reported to extend survival through mechanisms related to the neurotransmitter glutamate.
  • Edaravone: May slow the rate of functional deterioration in some patients (indications and effects vary depending on the patient group).
  • Symptomatic treatment: Control of oral secretions (e.g., anticholinergic drugs), muscle relaxants for spasms and spasticity (e.g., baclofen and tizanidine), and symptomatic treatment for pain, insomnia, and depression.
• Respiratory support
  • Noninvasive positive-pressure ventilation (NIV, e.g., CPAP/BiPAP): May improve survival and quality of life in cases of nocturnal hypoventilation and respiratory muscle weakness.
  • In the terminal stage, endotracheal intubation, mechanical ventilation, or tracheostomy may be considered (determined according to the patient's wishes and treatment goals).
• Nutrition and swallowing management
  • If dysphagia progresses, gastrostomy (PEG) placement may be considered to prevent aspiration and provide nutritional supplementation.
  • Weight loss and malnutrition adversely affect the prognosis.
• Rehabilitation and assistive devices
  • Physical and occupational therapy to maintain function, fall-prevention education, and use of assistive devices (cane, walker, and powered wheelchair).
  • Speech therapy (augmentative and alternative communication devices) and respiratory rehabilitation.
• Multidisciplinary care
  • Integrated management by a team including neurology, pulmonology, nutrition, rehabilitation, speech therapy, clinical nutrition, mental health, and hospice care is recommended.
• Genetic testing and genetic counseling
  • Genetic testing may be considered when there is a family history or suspected clinical findings.
• Clinical trials
  • Research on various new drugs and gene therapies is ongoing, and eligible patients may consider participating in clinical trials.
• Precautions and risk of complications
  • Aspiration pneumonia, respiratory failure, malnutrition, pressure sores, thrombosis, and psychosocial burdens (depression and anxiety), among others.
  • Consult medical professionals immediately if falls, aspiration, or shortness of breath occurs in daily life.
  • Vaccination (influenza and pneumococcal vaccines) and hand hygiene are recommended to prevent infections such as influenza and pneumonia.

Checklist Before an Outpatient Visit (Including Examples of Items to Bring and Questions)

• Items to bring (recommended)
  • A list of currently used medications (including prescription drugs, over-the-counter medications, and herbal medicines)
  • Copies of recent test results (EMG/electromyography, MRI, blood tests, pulmonary function tests/nocturnal oxygen saturation)
  • The timing and progression of symptoms (organized chronologically) and records of weight changes
  • The presence and timing of swallowing problems, changes in coughing strength, and shortness of breath (e.g., at night or during exercise)
  • Walking status (whether independent walking is possible) and whether assistive devices are used
  • Information about family history (neurological diseases, genetic diseases, etc.)
  • Documents related to the patient's advance decisions or wishes regarding life-sustaining treatment (if possible)
• Items useful to record for the outpatient visit
  • Changes in daily activities over the past 1–3 months (self-care ability, eating, hygiene, and mobility)
  • Shortness of breath during sleep or headache and fatigue upon waking (indicators of hypoventilation)
  • Excessive saliva or episodes of vomiting or aspiration
  • Weakening of the cough, fever, or respiratory symptoms
• Examples of photos and videos to show medical professionals during the outpatient visit
  • Videos of walking, speaking, and swallowing (when reproducing the problem)

General Example Questions to Ask the Doctor

• "What are the expected effects and side effects of this medication (riluzole and edaravone)?"
• "When should respiratory support (noninvasive ventilation) be started? What are the criteria for starting it?"
• "When dysphagia becomes severe, what is the appropriate timing for PEG placement, and what are its advantages and disadvantages?"
• "What should I be careful about in daily life to prevent falls, aspiration, and shortness of breath?"
• "Could there be a genetic risk for my family? Is genetic testing needed?"

Examples of Disease-Specific Questions

• "How should the extent of upper and lower motor neuron damage be interpreted in my EMG/electromyography results? Have other possible diseases been sufficiently ruled out?"
• "When respiratory function measurements (e.g., nocturnal oxygen saturation and baseline pulmonary function tests) are at this level, do you recommend noninvasive ventilation?"
• Additional (optional): "What assistive communication devices would be effective in preparation for worsening speech and swallowing function? Are there any recommended products or rehabilitation programs?"

(Important) Follow the doctor's instructions immediately during outpatient visits or hospitalization. If symptoms change suddenly (shortness of breath, severe difficulty swallowing, high fever, etc.), visiting an emergency room is recommended.