Spinocerebellar ataxia

Disease Description (Causes and Symptoms)

• Definition: A condition in which cerebrospinal fluid (CSF) accumulates excessively within the ventricles or cranial cavity, causing increased intracranial pressure (acute) or persistent ventricular enlargement (including arrested hydrocephalus).
• Pathophysiology: Caused by an imbalance between CSF production and absorption or obstruction of its circulation pathways (including the interventricular, ventriculo-subarachnoid, and arachnoid villi pathways). Classified into congenital abnormalities (e.g., abnormalities of the ventricular outlets and meningeal malformations) and acquired factors (brain tumors, hemorrhage, infection [bacterial or viral meningitis], trauma, etc.).
• Main symptoms
  • Infants: Rapid increase in head circumference, bulging fontanelle, 'setting-sun' phenomenon (eyes deviated downward), floppiness and feeding difficulty, lethargy and excessive sleepiness
  • Children and adults: Headache, vomiting, decreased vision, diplopia and ocular motor impairment, papilledema (optic disc swelling), motor paralysis (mainly in the lower limbs), gait disturbance, and decreased memory and cognition
  • Normal-pressure hydrocephalus (mainly in older adults): Gait disturbance, dementia-like memory decline, and urinary incontinence (classic triad)
• Risk of complications: Delayed cognitive and motor development due to brain tissue damage, optic nerve damage, seizures, etc.

Treatment Methods

• Principle: Individualized treatment according to the cause and pathophysiology (relieving the obstruction, diverting CSF, or improving absorption).
• Surgical treatment
  • Endoscopic third ventriculostomy (ETV): Creates a bypass to restore CSF flow in hydrocephalus caused by obstruction (e.g., obstruction at the opening of the third ventricle). It is not applicable to all patients.
  • Ventriculoperitoneal shunt insertion (ventriculoperitoneal shunt, VP shunt): The most widely performed method. Drainage volume is regulated with a valve. Complications (infection, malfunction, overdrainage, etc.) may occur.
  • Other drainage procedures (such as a ventriculoatrial shunt) or treatment of the cause, such as tumor resection
  • Surgical emergency treatment: External ventricular drainage (EVD) — temporary decompression in cases of acute increased intracranial pressure
• Medication and supportive treatment
  • Temporary control of intracranial pressure (with limited evidence): Osmotic agents (e.g., mannitol), diuretics (e.g., furosemide), or carbonic anhydrase inhibitors (acetazolamide) — used as adjunctive treatment before or during definitive treatment of the cause
  • For infectious causes, antibiotic treatment and elimination of the cause
• Lifestyle management and follow-up
  • Long-term follow-up after surgery (especially for shunt patients): Monitoring for malfunction and infection
  • Infants: Recording head circumference measurements and developmental assessments
• Precautions
  • Shunt patients require immediate medical evaluation if abnormal symptoms occur, such as fever, abdominal pain and vomiting, sudden headache or decreased consciousness, or wound problems
  • Infection, malfunction, and overdrainage (headache, groin pain, etc.) may occur after surgery
• Prognosis: Varies depending on the cause, timing of diagnosis and treatment, and presence or absence of complications. Function may be preserved with early diagnosis and appropriate treatment, but permanent neurological damage may remain.

Outpatient Visit Checkpoints (Including Examples of Items to Bring and Questions)

• Items to bring (recommended for the visit)
  • A list of medications currently being taken (including prescription and nonprescription medications)
  • Previous medical and surgical records (especially the shunt-related procedure name, insertion date, and valve type)
  • Existing imaging materials (CT/MRI/head ultrasound) or a CD/USB (if unavailable, the test results)
  • A record of changes in physical symptoms (when symptoms began, their progression, presence of fever, vomiting, changes in consciousness, etc.)
  • For infants, records of head circumference measurements and notes on developmental status
  • Shunt card for shunt patients (if issued by the hospital)
• Information to tell the doctor in advance at the outpatient visit
  • Recent symptoms (when they started, how frequently they occur, aggravating factors)
  • Suspected infection (fever, wound problems, redness around the device site)
  • History of trauma (whether there has been head trauma)
  • Whether pregnant (adult women)
• Tests likely to be checked first during the visit
  • Neurological examination, visual field and optic nerve examination
  • CT or MRI if necessary; head ultrasound for newborns
  • Blood and urine tests (if infection is suspected)
  • In some cases, a radionuclide CSF flow study (special cases)

Examples of General Questions to Ask the Doctor

• "What do you think is causing my symptoms? Can the cause be eliminated?"
• "What are the advantages and disadvantages of the recommended treatment and the risks of complications?"
• "What will the recovery period and long-term follow-up plan be after surgery (e.g., shunt insertion or ETV)?"
• "What are the side effects of this medication (or treatment), and what precautions should I take?"
• "What is the expected prognosis, and is neurological function (development/cognition/vision) likely to recover?"

Examples of Disease-Specific Questions

• For parents or guardians of infants: "What significance do my child's head circumference growth curve and neurodevelopmental assessment have in the current situation? How are the timing and risks of surgery determined?"
• For patients with a shunt: "What type of shunt (valve type) do I have, and are there any precautions for MRI examinations? If signs of infection or blockage appear, which symptoms should I check for first?"